diff options
Diffstat (limited to 'firefox')
| -rw-r--r-- | firefox/user.js | 1629 |
1 files changed, 694 insertions, 935 deletions
diff --git a/firefox/user.js b/firefox/user.js index bef679e..ccbb827 100644 --- a/firefox/user.js +++ b/firefox/user.js @@ -1,13 +1,13 @@ /****** * name: arkenfox user.js -* date: 25 April 2021 -* version 89-alpha +* date: 10 September 2021 +* version 92-alpha * url: https://github.com/arkenfox/user.js * license: MIT: https://github.com/arkenfox/user.js/blob/master/LICENSE.txt * README: - 1. Consider using Tor Browser if it meets your needs or fits your threat model better + 1. Consider using Tor Browser if it meets your needs or fits your threat model * https://www.torproject.org/about/torusers.html.en 2. Required reading: Overview, Backing Up, Implementing, and Maintenance entries * https://github.com/arkenfox/user.js/wiki @@ -18,74 +18,67 @@ * Some site breakage and unintended consequences will happen. Everyone's experience will differ e.g. some user data is erased on close (section 2800), change this to suit your needs * While not 100% definitive, search for "[SETUP" tags - e.g. third party images/videos not loading on some sites? check 1603 + e.g. third party images/videos not loading on some sites? check 1601 * Take the wiki link in step 2 and read the Troubleshooting entry 5. Some tag info [SETUP-SECURITY] it's one item, read it [SETUP-WEB] can cause some websites to break [SETUP-CHROME] changes how Firefox itself behaves (i.e. not directly website related) - [SETUP-PERF] may impact performance - [WARNING] used sparingly, heed them 6. Override Recipes: https://github.com/arkenfox/user.js/issues/1080 * RELEASES: https://github.com/arkenfox/user.js/releases * It is best to use the arkenfox release that is optimized for and matches your Firefox version * EVERYONE: each release - - run prefsCleaner or reset deprecated prefs (9999s) and prefs made redundant by RPF (4600s) - - re-enable section 4600 if you don't use RFP + - run prefsCleaner to reset prefs made inactive, including deprecated (9999s) ESR78 - If you are not using arkenfox v78... (not a definitive list) - 1244: HTTPS-Only mode is enabled - - 1401: document fonts is inactive as it is now covered by RFP in FF80+ - - 4600: some prefs may apply even if you use RFP + - 4511: non-native widget theme is enforced - 9999: switch the appropriate deprecated section(s) back on * INDEX: 0100: STARTUP 0200: GEOLOCATION / LANGUAGE / LOCALE - 0300: QUIET FOX - 0400: BLOCKLISTS / SAFE BROWSING - 0500: SYSTEM ADD-ONS / EXPERIMENTS + 0300: QUIETER FOX + 0400: SAFE BROWSING 0600: BLOCK IMPLICIT OUTBOUND - 0700: HTTP* / TCP/IP / DNS / PROXY / SOCKS etc + 0700: DNS / DoH / PROXY / SOCKS / IPv6 0800: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS 0900: PASSWORDS - 1000: CACHE / SESSION (RE)STORE / FAVICONS - 1200: HTTPS (SSL/TLS / OCSP / CERTS / HPKP / CIPHERS) + 1000: DISK AVOIDANCE + 1200: HTTPS (SSL/TLS / OCSP / CERTS / HPKP) 1400: FONTS 1600: HEADERS / REFERERS 1700: CONTAINERS - 1800: PLUGINS - 2000: MEDIA / CAMERA / MIC - 2200: WINDOW MEDDLING & LEAKS / POPUPS + 2000: PLUGINS / MEDIA / WEBRTC 2300: WEB WORKERS - 2400: DOM (DOCUMENT OBJECT MODEL) & JAVASCRIPT - 2500: HARDWARE FINGERPRINTING + 2400: DOM (DOCUMENT OBJECT MODEL) 2600: MISCELLANEOUS 2700: PERSISTENT STORAGE 2800: SHUTDOWN 4000: FPI (FIRST PARTY ISOLATION) 4500: RFP (RESIST FINGERPRINTING) - 4600: RFP ALTERNATIVES - 4700: RFP ALTERNATIVES (USER AGENT SPOOFING) - 5000: PERSONAL + 5000: OPTIONAL OPSEC + 5500: OPTIONAL HARDENING + 6000: DON'T TOUCH + 7000: DON'T BOTHER + 8000: DON'T BOTHER: NON-RFP + 9000: PERSONAL 9999: DEPRECATED / REMOVED / LEGACY / RENAMED ******/ /* START: internal custom pref to test for syntax errors - * [NOTE] In FF60+, not all syntax errors cause parsing to abort i.e. reaching the last debug - * pref no longer necessarily means that all prefs have been applied. Check the console right + * [NOTE] Not all syntax errors cause parsing to abort i.e. reaching the last debug pref + * no longer necessarily means that all prefs have been applied. Check the console right * after startup for any warnings/error messages related to non-applied prefs * [1] https://blog.mozilla.org/nnethercote/2018/03/09/a-new-preferences-parser-for-firefox/ ***/ user_pref("_user.js.parrot", "START: Oh yes, the Norwegian Blue... what's wrong with it?"); -/* 0000: disable about:config warning - * FF73-86: chrome://global/content/config.xhtml ***/ -user_pref("general.warnOnAboutConfig", false); // XHTML version -user_pref("browser.aboutConfig.showWarning", false); // HTML version [FF71+] +/* 0000: disable about:config warning ***/ +user_pref("browser.aboutConfig.showWarning", false); /*** [SECTION 0100]: STARTUP ***/ user_pref("_user.js.parrot", "0100 syntax error: the parrot's dead!"); @@ -94,7 +87,7 @@ user_pref("_user.js.parrot", "0100 syntax error: the parrot's dead!"); user_pref("browser.shell.checkDefaultBrowser", false); /* 0102: set startup page [SETUP-CHROME] * 0=blank, 1=home, 2=last visited page, 3=resume previous session - * [NOTE] Session Restore is not used in PB mode (0110) and is cleared with history (2803, 2804) + * [NOTE] Session Restore is cleared with history (2803, 2804), and not used in Private Browsing mode * [SETTING] General>Startup>Restore previous session ***/ user_pref("browser.startup.page", 0); /* 0103: set HOME+NEWWINDOW page @@ -106,111 +99,97 @@ user_pref("browser.startup.homepage", "about:blank"); * [SETTING] Home>New Windows and Tabs>New tabs ***/ user_pref("browser.newtabpage.enabled", false); user_pref("browser.newtab.preload", false); -/* 0105: disable Activity Stream stuff (AS) - * AS is the default homepage/newtab in FF57+, based on metadata and browsing behavior. - * **NOT LISTING ALL OF THESE: USE THE PREFERENCES UI** +/* 0105: disable some Activity Stream items + * Activity Stream is the default homepage/newtab based on metadata and browsing behavior * [SETTING] Home>Firefox Home Content>... to show/hide what you want ***/ -/* 0105a: disable Activity Stream telemetry ***/ user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false); user_pref("browser.newtabpage.activity-stream.telemetry", false); -/* 0105b: disable Activity Stream Snippets - * Runs code received from a server (aka Remote Code Execution) and sends information back to a metrics server - * [1] https://abouthome-snippets-service.readthedocs.io/ ***/ user_pref("browser.newtabpage.activity-stream.feeds.snippets", false); // [DEFAULT: false FF89+] -/* 0105c: disable Activity Stream Top Stories, Pocket-based and/or sponsored content ***/ user_pref("browser.newtabpage.activity-stream.feeds.section.topstories", false); user_pref("browser.newtabpage.activity-stream.section.highlights.includePocket", false); user_pref("browser.newtabpage.activity-stream.showSponsored", false); user_pref("browser.newtabpage.activity-stream.feeds.discoverystreamfeed", false); // [FF66+] -/* 0105e: clear default topsites +user_pref("browser.newtabpage.activity-stream.showSponsoredTopSites", false); // [FF83+] +/* 0106: clear default topsites * [NOTE] This does not block you from adding your own ***/ user_pref("browser.newtabpage.activity-stream.default.sites", ""); -/* 0110: start Firefox in PB (Private Browsing) mode - * [NOTE] In this mode *all* windows are "private windows" and the PB mode icon is not displayed - * [WARNING] The P in PB mode is misleading: it means no "persistent" disk storage such as history, - * caches, searches, cookies, localStorage, IndexedDB etc (which you can achieve in normal mode). - * In fact, PB mode limits or removes the ability to control some of these, and you need to quit - * Firefox to clear them. PB is best used as a one off window (File>New Private Window) to provide - * a temporary self-contained new session. Close all Private Windows to clear the PB mode session. - * [SETTING] Privacy & Security>History>Custom Settings>Always use private browsing mode - * [1] https://wiki.mozilla.org/Private_Browsing - * [2] https://spreadprivacy.com/is-private-browsing-really-private/ ***/ - // user_pref("browser.privatebrowsing.autostart", true); /*** [SECTION 0200]: GEOLOCATION / LANGUAGE / LOCALE ***/ user_pref("_user.js.parrot", "0200 syntax error: the parrot's definitely deceased!"); -/** GEOLOCATION ***/ -/* 0201: disable Location-Aware Browsing - * [NOTE] Best left at default "true", fingerprintable, already behind a prompt (see 0202) - * [1] https://www.mozilla.org/firefox/geolocation/ ***/ - // user_pref("geo.enabled", false); -/* 0202: set a default permission for Location (see 0201) [FF58+] - * 0=always ask (default), 1=allow, 2=block - * [NOTE] Best left at default "always ask", fingerprintable via Permissions API - * [SETTING] to add site exceptions: Ctrl+I>Permissions>Access Your Location - * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Location>Settings ***/ - // user_pref("permissions.default.geo", 2); -/* 0203: use Mozilla geolocation service instead of Google when geolocation is enabled [FF74+] +/* 0201: use Mozilla geolocation service instead of Google if permission is granted [FF74+] * Optionally enable logging to the console (defaults to false) ***/ user_pref("geo.provider.network.url", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%"); // user_pref("geo.provider.network.logging.enabled", true); // [HIDDEN PREF] -/* 0204: disable using the OS's geolocation service ***/ +/* 0202: disable using the OS's geolocation service ***/ user_pref("geo.provider.ms-windows-location", false); // [WINDOWS] user_pref("geo.provider.use_corelocation", false); // [MAC] user_pref("geo.provider.use_gpsd", false); // [LINUX] -/* 0207: disable region updates +/* 0203: disable region updates * [1] https://firefox-source-docs.mozilla.org/toolkit/modules/toolkit_modules/Region.html ***/ user_pref("browser.region.network.url", ""); // [FF78+] user_pref("browser.region.update.enabled", false); // [[FF79+] -/* 0208: set search region - * [NOTE] May not be hidden if Firefox has changed your settings due to your region (see 0207) ***/ +/* 0204: set search region + * [NOTE] May not be hidden if Firefox has changed your settings due to your region (0203) ***/ // user_pref("browser.search.region", "US"); // [HIDDEN PREF] - -/** LANGUAGE / LOCALE ***/ /* 0210: set preferred language for displaying web pages * [TEST] https://addons.mozilla.org/about ***/ user_pref("intl.accept_languages", "en-US, en"); -/* 0211: enforce US English locale regardless of the system locale +/* 0211: use US English locale regardless of the system locale * [SETUP-WEB] May break some input methods e.g xim/ibus for CJK languages [1] * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=867501,1629630 ***/ user_pref("javascript.use_us_english_locale", true); // [HIDDEN PREF] -/*** [SECTION 0300]: QUIET FOX - We only disable the auto-INSTALL of Firefox (app) updates. You still get prompts to update, - and it only takes one click. We highly discourage disabling auto-CHECKING for updates. - - Legitimate reasons to disable auto-INSTALLS include hijacked/monetized extensions, time - constraints, legacy issues, dev/testing, and fear of breakage/bugs. It is still important - to do updates for security reasons, please do so manually if you make changes. -***/ +/*** [SECTION 0300]: QUIETER FOX ***/ user_pref("_user.js.parrot", "0300 syntax error: the parrot's not pinin' for the fjords!"); -/* 0301b: disable auto-CHECKING for extension and theme updates ***/ - // user_pref("extensions.update.enabled", false); -/* 0302a: disable auto-INSTALLING Firefox updates [NON-WINDOWS FF65+] - * [NOTE] In FF65+ on Windows this SETTING (below) is now stored in a file and the pref was removed +/** UPDATES ***/ +/* 0301: disable auto-INSTALLING Firefox updates [NON-WINDOWS] + * [NOTE] You will still get prompts to update, and should do so in a timely manner * [SETTING] General>Firefox Updates>Check for updates but let you choose to install them ***/ user_pref("app.update.auto", false); -/* 0302b: disable auto-INSTALLING extension and theme updates (after the check in 0301b) +/* 0302: disable auto-INSTALLING Firefox updates via a background service [FF90+] [WINDOWS] + * [SETTING] General>Firefox Updates>Automatically install updates>When Firefox is not running + * [1] https://support.mozilla.org/kb/enable-background-updates-firefox-windows ***/ +user_pref("app.update.background.scheduling.enabled", false); +/* 0303: disable auto-CHECKING for extension and theme updates ***/ + // user_pref("extensions.update.enabled", false); +/* 0304: disable auto-INSTALLING extension and theme updates (after the check in 0303) * [SETTING] about:addons>Extensions>[cog-wheel-icon]>Update Add-ons Automatically (toggle) ***/ // user_pref("extensions.update.autoUpdateDefault", false); -/* 0306: disable extension metadata +/* 0305: disable extension metadata * used when installing/updating an extension, and in daily background update checks: * when false, extension detail tabs will have no description ***/ // user_pref("extensions.getAddons.cache.enabled", false); -/* 0308: disable search engine updates (e.g. OpenSearch) +/* 0306: disable search engine updates (e.g. OpenSearch) * [NOTE] This does not affect Mozilla's built-in or Web Extension search engines ***/ user_pref("browser.search.update", false); -/* 0320: disable about:addons' Recommendations pane (uses Google Analytics) ***/ +/* 0307: disable System Add-on updates ***/ +user_pref("extensions.systemAddon.update.enabled", false); // [FF62+] +user_pref("extensions.systemAddon.update.url", ""); // [FF44+] + +/** RECOMMENDATIONS ***/ +/* 0320: disable recommendation pane in about:addons (uses Google Analytics) ***/ user_pref("extensions.getAddons.showPane", false); // [HIDDEN PREF] /* 0321: disable recommendations in about:addons' Extensions and Themes panes [FF68+] ***/ user_pref("extensions.htmlaboutaddons.recommendations.enabled", false); -/* 0330: disable telemetry - * the pref (.unified) affects the behaviour of the pref (.enabled) - * IF unified=false then .enabled controls the telemetry module - * IF unified=true then .enabled ONLY controls whether to record extended data - * so make sure to have both set as false - * [NOTE] FF58+ 'toolkit.telemetry.enabled' is now LOCKED to reflect prerelease - * or release builds (true and false respectively) [2] +/* 0322: disable personalized Extension Recommendations in about:addons and AMO [FF65+] + * [NOTE] This pref has no effect when Health Reports (0331) are disabled + * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to make personalized extension recommendations + * [1] https://support.mozilla.org/kb/personalized-extension-recommendations ***/ +user_pref("browser.discovery.enabled", false); + +/** TELEMETRY ***/ +/* 0330: disable new data submission [FF41+] + * If disabled, no policy is shown or upload takes place, ever + * [1] https://bugzilla.mozilla.org/1195552 ***/ +user_pref("datareporting.policy.dataSubmissionEnabled", false); +/* 0331: disable Health Reports + * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send technical... data ***/ +user_pref("datareporting.healthreport.uploadEnabled", false); +/* 0332: disable telemetry + * The "unified" pref affects the behaviour of the "enabled" pref + * - If "unified" is false then "enabled" controls the telemetry module + * - If "unified" is true then "enabled" only controls whether to record extended data + * [NOTE] "toolkit.telemetry.enabled" is now LOCKED to reflect prerelease (true) or release builds (false) [2] * [1] https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html * [2] https://medium.com/georg-fritzsche/data-preference-changes-in-firefox-58-2d5df9c428b5 ***/ user_pref("toolkit.telemetry.unified", false); @@ -222,26 +201,26 @@ user_pref("toolkit.telemetry.shutdownPingSender.enabled", false); // [FF55+] user_pref("toolkit.telemetry.updatePing.enabled", false); // [FF56+] user_pref("toolkit.telemetry.bhrPing.enabled", false); // [FF57+] Background Hang Reporter user_pref("toolkit.telemetry.firstShutdownPing.enabled", false); // [FF57+] -/* 0331: disable Telemetry Coverage +/* 0333: disable Telemetry Coverage * [1] https://blog.mozilla.org/data/2018/08/20/effectively-measuring-search-in-firefox/ ***/ user_pref("toolkit.telemetry.coverage.opt-out", true); // [HIDDEN PREF] user_pref("toolkit.coverage.opt-out", true); // [FF64+] [HIDDEN PREF] user_pref("toolkit.coverage.endpoint.base", ""); -/* 0340: disable Health Reports - * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send technical... data ***/ -user_pref("datareporting.healthreport.uploadEnabled", false); -/* 0341: disable new data submission, master kill switch [FF41+] - * If disabled, no policy is shown or upload takes place, ever - * [1] https://bugzilla.mozilla.org/1195552 ***/ -user_pref("datareporting.policy.dataSubmissionEnabled", false); -/* 0342: disable Studies (see 0503) +/* 0334: disable PingCentre telemetry (used in several System Add-ons) [FF57+] + * Defense-in-depth: currently covered by 0331 ***/ +user_pref("browser.ping-centre.telemetry", false); + +/** STUDIES ***/ +/* 0340: disable Studies * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to install and run studies ***/ user_pref("app.shield.optoutstudies.enabled", false); -/* 0343: disable personalized Extension Recommendations in about:addons and AMO [FF65+] - * [NOTE] This pref has no effect when Health Reports (0340) are disabled - * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to make personalized extension recommendations - * [1] https://support.mozilla.org/kb/personalized-extension-recommendations ***/ -user_pref("browser.discovery.enabled", false); +/* 0341: disable Normandy/Shield [FF60+] + * Shield is a telemetry system that can push and test "recipes" + * [1] https://mozilla.github.io/normandy/ ***/ +user_pref("app.normandy.enabled", false); +user_pref("app.normandy.api_url", ""); + +/** CRASH REPORTS ***/ /* 0350: disable Crash Reports ***/ user_pref("breakpad.reportURL", ""); user_pref("browser.tabs.crashReporting.sendReport", false); // [FF44+] @@ -249,103 +228,57 @@ user_pref("browser.tabs.crashReporting.sendReport", false); // [FF44+] /* 0351: enforce no submission of backlogged Crash Reports [FF58+] * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send backlogged crash reports ***/ user_pref("browser.crashReports.unsubmittedCheck.autoSubmit2", false); // [DEFAULT: false] -/* 0390: disable Captive Portal detection - * [1] https://www.eff.org/deeplinks/2017/08/how-captive-portals-interfere-wireless-security-and-privacy - * [2] https://wiki.mozilla.org/Necko/CaptivePortal ***/ + +/** OTHER ***/ +/* 0360: disable Captive Portal detection + * [1] https://www.eff.org/deeplinks/2017/08/how-captive-portals-interfere-wireless-security-and-privacy ***/ user_pref("captivedetect.canonicalURL", ""); user_pref("network.captive-portal-service.enabled", false); // [FF52+] -/* 0391: disable Network Connectivity checks [FF65+] +/* 0361: disable Network Connectivity checks [FF65+] * [1] https://bugzilla.mozilla.org/1460537 ***/ user_pref("network.connectivity-service.enabled", false); +/* 0362: enforce disabling of Web Compatibility Reporter [FF56+] + * Web Compatibility Reporter adds a "Report Site Issue" button to send data to Mozilla ***/ +user_pref("extensions.webcompat-reporter.enabled", false); // [DEFAULT: false] -/*** [SECTION 0400]: BLOCKLISTS / SAFE BROWSING (SB) ***/ -user_pref("_user.js.parrot", "0400 syntax error: the parrot's passed on!"); -/** BLOCKLISTS ***/ -/* 0401: enforce Firefox blocklist - * [NOTE] It includes updates for "revoked certificates" - * [1] https://blog.mozilla.org/security/2015/03/03/revoking-intermediate-certificates-introducing-onecrl/ ***/ -user_pref("extensions.blocklist.enabled", true); // [DEFAULT: true] - -/** SAFE BROWSING (SB) - Safe Browsing has taken many steps to preserve privacy. *IF* required, a full url is never - sent to Google, only a PART-hash of the prefix, and this is hidden with noise of other real - PART-hashes. Google also swear it is anonymized and only used to flag malicious sites. - Firefox also takes measures such as striping out identifying parameters and since SBv4 (FF57+) - doesn't even use cookies. (#Turn on browser.safebrowsing.debug to monitor this activity) +/*** [SECTION 0400]: SAFE BROWSING (SB) + SB has taken many steps to preserve privacy. If required, a full url is never sent + to Google, only a part-hash of the prefix, hidden with noise of other real part-hashes. + Firefox takes measures such as stripping out identifying parameters and since SBv4 (FF57+) + doesn't even use cookies. (#Turn on browser.safebrowsing.debug to monitor this activity) + FWIW, Google also swear it is anonymized and only used to flag malicious sites. - [1] https://feeding.cloud.geek.nz/posts/how-safe-browsing-works-in-firefox/ - [2] https://wiki.mozilla.org/Security/Safe_Browsing - [3] https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work + [1] https://feeding.cloud.geek.nz/posts/how-safe-browsing-works-in-firefox/ + [2] https://wiki.mozilla.org/Security/Safe_Browsing + [3] https://support.mozilla.org/kb/how-does-phishing-and-malware-protection-work ***/ -/* 0410: disable SB (Safe Browsing) - * [WARNING] Do this at your own risk! These are the master switches. - * [SETTING] Privacy & Security>Security>... "Block dangerous and deceptive content" ***/ +user_pref("_user.js.parrot", "0400 syntax error: the parrot's passed on!"); +/* 0401: disable SB (Safe Browsing) + * [WARNING] Do this at your own risk! These are the master switches + * [SETTING] Privacy & Security>Security>... Block dangerous and deceptive content ***/ // user_pref("browser.safebrowsing.malware.enabled", false); // user_pref("browser.safebrowsing.phishing.enabled", false); -/* 0411: disable SB checks for downloads (both local lookups + remote) - * This is the master switch for the safebrowsing.downloads* prefs (0412, 0413) +/* 0402: disable SB checks for downloads (both local lookups + remote) + * This is the master switch for the safebrowsing.downloads* prefs (0403, 0404) * [SETTING] Privacy & Security>Security>... "Block dangerous downloads" ***/ // user_pref("browser.safebrowsing.downloads.enabled", false); -/* 0412: disable SB checks for downloads (remote) +/* 0403: disable SB checks for downloads (remote) * To verify the safety of certain executable files, Firefox may submit some information about the * file, including the name, origin, size and a cryptographic hash of the contents, to the Google * Safe Browsing service which helps Firefox determine whether or not the file should be blocked * [SETUP-SECURITY] If you do not understand this, or you want this protection, then override it ***/ user_pref("browser.safebrowsing.downloads.remote.enabled", false); user_pref("browser.safebrowsing.downloads.remote.url", ""); -/* 0413: disable SB checks for unwanted software +/* 0404: disable SB checks for unwanted software * [SETTING] Privacy & Security>Security>... "Warn you about unwanted and uncommon software" ***/ // user_pref("browser.safebrowsing.downloads.remote.block_potentially_unwanted", false); // user_pref("browser.safebrowsing.downloads.remote.block_uncommon", false); -/* 0419: disable 'ignore this warning' on SB warnings [FF45+] +/* 0405: disable "ignore this warning" on SB warnings [FF45+] * If clicked, it bypasses the block for that session. This is a means for admins to enforce SB * [TEST] see github wiki APPENDIX A: Test Sites: Section 5 * [1] https://bugzilla.mozilla.org/1226490 ***/ // user_pref("browser.safebrowsing.allowOverride", false); -/*** [SECTION 0500]: SYSTEM ADD-ONS / EXPERIMENTS - System Add-ons are a method for shipping extensions, considered to be - built-in features to Firefox, that are hidden from the about:addons UI. - To view your System Add-ons go to about:support, they are listed under "Firefox Features" - - * Portable: "...\App\Firefox64\browser\features\" (or "App\Firefox\etc" for 32bit) - * Windows: "...\Program Files\Mozilla\browser\features" (or "Program Files (X86)\etc" for 32bit) - * Mac: "...\Applications\Firefox\Contents\Resources\browser\features\" - [NOTE] On Mac you can right-click on the application and select "Show Package Contents" - * Linux: "/usr/lib/firefox/browser/features" (or similar) - - [1] https://firefox-source-docs.mozilla.org/toolkit/mozapps/extensions/addon-manager/SystemAddons.html - [2] https://searchfox.org/mozilla-central/source/browser/extensions -***/ -user_pref("_user.js.parrot", "0500 syntax error: the parrot's cashed in 'is chips!"); -/* 0503: disable Normandy/Shield [FF60+] - * Shield is an telemetry system (including Heartbeat) that can also push and test "recipes" - * [1] https://wiki.mozilla.org/Firefox/Shield - * [2] https://github.com/mozilla/normandy ***/ -user_pref("app.normandy.enabled", false); -user_pref("app.normandy.api_url", ""); -/* 0505: disable System Add-on updates ***/ -user_pref("extensions.systemAddon.update.enabled", false); // [FF62+] -user_pref("extensions.systemAddon.update.url", ""); // [FF44+] -/* 0506: disable PingCentre telemetry (used in several System Add-ons) [FF57+] - * Currently blocked by 'datareporting.healthreport.uploadEnabled' (see 0340) ***/ -user_pref("browser.ping-centre.telemetry", false); -/* 0515: disable Screenshots ***/ - // user_pref("extensions.screenshots.disabled", true); // [FF55+] -/* 0517: disable Form Autofill - * [NOTE] Stored data is NOT secure (uses a JSON file) - * [NOTE] Heuristics controls Form Autofill on forms without @autocomplete attributes - * [SETTING] Privacy & Security>Forms and Autofill>Autofill addresses - * [1] https://wiki.mozilla.org/Firefox/Features/Form_Autofill ***/ -user_pref("extensions.formautofill.addresses.enabled", false); // [FF55+] -user_pref("extensions.formautofill.available", "off"); // [FF56+] -user_pref("extensions.formautofill.creditCards.available", false); // [FF57+] -user_pref("extensions.formautofill.creditCards.enabled", false); // [FF56+] -user_pref("extensions.formautofill.heuristics.enabled", false); // [FF55+] -/* 0518: enforce disabling of Web Compatibility Reporter [FF56+] - * Web Compatibility Reporter adds a "Report Site Issue" button to send data to Mozilla ***/ -user_pref("extensions.webcompat-reporter.enabled", false); // [DEFAULT: false] - /*** [SECTION 0600]: BLOCK IMPLICIT OUTBOUND [not explicitly asked for - e.g. clicked on] ***/ user_pref("_user.js.parrot", "0600 syntax error: the parrot's no more!"); /* 0601: disable link prefetching @@ -358,60 +291,36 @@ user_pref("network.dns.disablePrefetch", true); /* 0603: disable predictor / prefetching ***/ user_pref("network.predictor.enabled", false); // user_pref("network.predictor.enable-prefetch", false); // [FF48+] [DEFAULT: false] -/* 0605: disable link-mouseover opening connection to linked server +/* 0604: disable link-mouseover opening connection to linked server * [1] https://news.slashdot.org/story/15/08/14/2321202/how-to-quash-firefoxs-silent-requests ***/ user_pref("network.http.speculative-parallel-limit", 0); -/* 0606: enforce no "Hyperlink Auditing" (click tracking) +/* 0605: enforce no "Hyperlink Auditing" (click tracking) * [1] https://www.bleepingcomputer.com/news/software/major-browsers-to-prevent-disabling-of-click-tracking-privacy-risk/ ***/ // user_pref("browser.send_pings", false); // [DEFAULT: false] -/*** [SECTION 0700]: HTTP* / TCP/IP / DNS / PROXY / SOCKS etc ***/ +/*** [SECTION 0700]: DNS / DoH / PROXY / SOCKS / IPv6 ***/ user_pref("_user.js.parrot", "0700 syntax error: the parrot's given up the ghost!"); /* 0701: disable IPv6 - * IPv6 can be abused, especially with MAC addresses, and can leak with VPNs. That's even - * assuming your ISP and/or router and/or website can handle it. Sites will fall back to IPv4 - * [STATS] Firefox telemetry (Dec 2020) shows ~8% of all connections are IPv6 - * [NOTE] This is just an application level fallback. Disabling IPv6 is best done at an + * IPv6 can be abused, especially with MAC addresses, and can leak with VPNs: assuming + * your ISP and/or router and/or website is IPv6 capable. Most sites will fall back to IPv4 + * [STATS] Firefox telemetry (July 2021) shows ~10% of all connections are IPv6 + * [NOTE] This is an application level fallback. Disabling IPv6 is best done at an * OS/network level, and/or configured properly in VPN setups. If you are not masking your IP, * then this won't make much difference. If you are masking your IP, then it can only help. * [NOTE] PHP defaults to IPv6 with "localhost". Use "php -S 127.0.0.1:PORT" * [TEST] https://ipleak.org/ - * [1] https://www.internetsociety.org/tag/ipv6-security/ (see Myths 2,4,5,6) ***/ + * [1] https://www.internetsociety.org/tag/ipv6-security/ (Myths 2,4,5,6) ***/ user_pref("network.dns.disableIPv6", true); -/* 0702: disable HTTP2 - * HTTP2 raises concerns with "multiplexing" and "server push", does nothing to - * enhance privacy, and opens up a number of server-side fingerprinting opportunities. - * [WARNING] Don't disable HTTP2. Don't be that one person using HTTP1.1 on HTTP2 sites - * [STATS] Over 50% of sites (April 2021) and growing [5] - * [1] https://http2.github.io/faq/ - * [2] https://blog.scottlogic.com/2014/11/07/http-2-a-quick-look.html - * [3] https://http2.github.io/http2-spec/#rfc.section.10.8 - * [4] https://queue.acm.org/detail.cfm?id=2716278 - * [5] https://w3techs.com/technologies/details/ce-http2/all/all ***/ - // user_pref("network.http.spdy.enabled", false); - // user_pref("network.http.spdy.enabled.deps", false); - // user_pref("network.http.spdy.enabled.http2", false); - // user_pref("network.http.spdy.websockets", false); // [FF65+] -/* 0703: disable HTTP Alternative Services [FF37+] - * [SETUP-PERF] Relax this if you have FPI enabled (see 4000) *AND* you understand the - * consequences. FPI isolates these, but it was designed with the Tor protocol in mind, - * and the Tor Browser has extra protection, including enhanced sanitizing per Identity. - * [1] https://tools.ietf.org/html/rfc7838#section-9 - * [2] https://www.mnot.net/blog/2016/03/09/alt-svc ***/ -user_pref("network.http.altsvc.enabled", false); -user_pref("network.http.altsvc.oe", false); -/* 0704: enforce the proxy server to do any DNS lookups when using SOCKS +/* 0702: set the proxy server to do any DNS lookups when using SOCKS * e.g. in Tor, this stops your local DNS server from knowing your Tor destination * as a remote Tor node will handle the DNS request * [1] https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers ***/ user_pref("network.proxy.socks_remote_dns", true); -/* 0708: disable FTP [FF60+] ***/ - // user_pref("network.ftp.enabled", false); // [DEFAULT: false FF88+] -/* 0709: disable using UNC (Uniform Naming Convention) paths [FF61+] +/* 0703: disable using UNC (Uniform Naming Convention) paths [FF61+] * [SETUP-CHROME] Can break extensions for profiles on network shares * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/26424 ***/ user_pref("network.file.disable_unc_paths", true); // [HIDDEN PREF] -/* 0710: disable GIO as a potential proxy bypass vector +/* 0704: disable GIO as a potential proxy bypass vector * Gvfs/GIO has a set of supported protocols like obex, network, archive, computer, dav, cdda, * gphoto2, trash, etc. By default only smb and sftp protocols are accepted so far (as of FF64) * [1] https://bugzilla.mozilla.org/1433507 @@ -419,20 +328,26 @@ user_pref("network.file.disable_unc_paths", true); // [HIDDEN PREF] * [3] https://en.wikipedia.org/wiki/GVfs * [4] https://en.wikipedia.org/wiki/GIO_(software) ***/ user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF] +/* 0705: disable DNS-over-HTTPS (DoH) rollout [FF60+] + * 0=off by default, 2=TRR (Trusted Recursive Resolver) first, 3=TRR only, 5=explicitly off + * see "doh-rollout.home-region": USA Feb 2020, Canada July 2021 [3] + * [1] https://hacks.mozilla.org/2018/05/a-cartoon-intro-to-dns-over-https/ + * [2] https://wiki.mozilla.org/Security/DOH-resolver-policy + * [3] https://blog.mozilla.org/mozilla/news/firefox-by-default-dns-over-https-rollout-in-canada/ + * [4] https://www.eff.org/deeplinks/2020/12/dns-doh-and-odoh-oh-my-year-review-2020 ***/ + // user_pref("network.trr.mode", 5); +/* 0706: disable proxy direct failover for system requests [FF91+] + * [WARNING] Default true is a security feature against malicious extensions + * [SETUP-CHROME] If you use a proxy and you trust your extensions ***/ + // user_pref("network.proxy.failover_direct", false); -/*** [SECTION 0800]: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS - Change items 0850 and above to suit for privacy vs convenience and functionality. Consider - your environment (no unwanted eyeballs), your device (restricted access), your device's - unattended state (locked, encrypted, forensic hardened). Likewise, you may want to check - the items cleared on shutdown in section 2800. - [1] https://xkcd.com/538/ -***/ +/*** [SECTION 0800]: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS ***/ user_pref("_user.js.parrot", "0800 syntax error: the parrot's ceased to be!"); /* 0801: disable location bar using search - * Don't leak URL typos to a search engine, give an error message instead. + * Don't leak URL typos to a search engine, give an error message instead * Examples: "secretplace,com", "secretplace/com", "secretplace com", "secret place.com" - * [NOTE] This does **not** affect explicit user action such as using search buttons in the - * dropdown, or using keyword search shortcuts you configure in options (e.g. 'd' for DuckDuckGo) + * [NOTE] This does not affect explicit user action such as using search buttons in the + * dropdown, or using keyword search shortcuts you configure in options (e.g. "d" for DuckDuckGo) * [SETUP-CHROME] If you don't, or rarely, type URLs, or you use a default search * engine that respects privacy, then you probably don't need this ***/ user_pref("keyword.enabled", false); @@ -446,172 +361,109 @@ user_pref("keyword.enabled", false); user_pref("browser.fixup.alternate.enabled", false); /* 0803: display all parts of the url in the location bar ***/ user_pref("browser.urlbar.trimURLs", false); -/* 0805: disable coloring of visited links - CSS history leak - * [SETUP-HARDEN] Bulk rapid history sniffing was mitigated in 2010 [1][2]. Slower and more expensive - * redraw timing attacks were largely mitigated in FF77+ [3]. Using RFP (4501) further hampers timing - * attacks. Don't forget clearing history on close (2803). However, social engineering [2#limits][4][5] - * and advanced targeted timing attacks could still produce usable results - * [1] https://developer.mozilla.org/docs/Web/CSS/Privacy_and_the_:visited_selector - * [2] https://dbaron.org/mozilla/visited-privacy - * [3] https://bugzilla.mozilla.org/1632765 - * [4] https://earthlng.github.io/testpages/visited_links.html (see github wiki APPENDIX A on how to use) - * [5] https://lcamtuf.blogspot.com/2016/08/css-mix-blend-mode-is-bad-for-keeping.html ***/ - // user_pref("layout.css.visited_links_enabled", false); -/* 0807: disable live search suggestions -/* [NOTE] Both must be true for the location bar to work +/* 0804: disable live search suggestions + * [NOTE] Both must be true for the location bar to work * [SETUP-CHROME] Change these if you trust and use a privacy respecting search engine * [SETTING] Search>Provide search suggestions | Show search suggestions in address bar results ***/ user_pref("browser.search.suggest.enabled", false); user_pref("browser.urlbar.suggest.searches", false); -/* 0810: disable location bar making speculative connections [FF56+] +/* 0805: disable location bar making speculative connections [FF56+] * [1] https://bugzilla.mozilla.org/1348275 ***/ user_pref("browser.urlbar.speculativeConnect.enabled", false); -/* 0811: disable location bar leaking single words to a DNS provider **after searching** [FF78+] +/* 0806: disable location bar leaking single words to a DNS provider **after searching** [FF78+] * 0=never resolve single words, 1=heuristic (default), 2=always resolve - * [NOTE] For FF78 value 1 and 2 are the same and always resolve but that will change in future versions * [1] https://bugzilla.mozilla.org/1642623 ***/ user_pref("browser.urlbar.dnsResolveSingleWordsAfterSearch", 0); -/* 0850a: disable location bar suggestion types - * [SETTING] Privacy & Security>Address Bar>When using the address bar, suggest ***/ - // user_pref("browser.urlbar.suggest.history", false); - // user_pref("browser.urlbar.suggest.bookmark", false); - // user_pref("browser.urlbar.suggest.openpage", false); - // user_pref("browser.urlbar.suggest.topsites", false); // [FF78+] -/* 0850b: disable tab-to-search [FF85+] +/* 0807: disable tab-to-search [FF85+] * Alternatively, you can exclude on a per-engine basis by unchecking them in Options>Search * [SETTING] Privacy & Security>Address Bar>When using the address bar, suggest>Search engines ***/ // user_pref("browser.urlbar.suggest.engines", false); -/* 0850c: disable location bar dropdown - * This value controls the total number of entries to appear in the location bar dropdown ***/ - // user_pref("browser.urlbar.maxRichResults", 0); -/* 0850d: disable location bar autofill - * [1] https://support.mozilla.org/en-US/kb/address-bar-autocomplete-firefox#w_url-autocomplete ***/ - // user_pref("browser.urlbar.autoFill", false); -/* 0860: disable search and form history +/* 0808: disable search and form history * [SETUP-WEB] Be aware that autocomplete form data can be read by third parties [1][2] - * [NOTE] We also clear formdata on exit (see 2803) + * [NOTE] We also clear formdata on exit (2803) * [SETTING] Privacy & Security>History>Custom Settings>Remember search and form history * [1] https://blog.mindedsecurity.com/2011/10/autocompleteagain.html * [2] https://bugzilla.mozilla.org/381681 ***/ user_pref("browser.formfill.enable", false); -/* 0862: disable browsing and download history - * [NOTE] We also clear history and downloads on exiting Firefox (see 2803) - * [SETTING] Privacy & Security>History>Custom Settings>Remember browsing and download history ***/ - // user_pref("places.history.enabled", false); -/* 0870: disable Windows jumplist [WINDOWS] ***/ -user_pref("browser.taskbar.lists.enabled", false); -user_pref("browser.taskbar.lists.frequent.enabled", false); -user_pref("browser.taskbar.lists.recent.enabled", false); -user_pref("browser.taskbar.lists.tasks.enabled", false); -/* 0871: disable Windows taskbar preview [WINDOWS] ***/ - // user_pref("browser.taskbar.previews.enable", false); // [DEFAULT: false] +/* 0809: disable Form Autofill + * [NOTE] Stored data is NOT secure (uses a JSON file) + * [NOTE] Heuristics controls Form Autofill on forms without @autocomplete attributes + * [SETTING] Privacy & Security>Forms and Autofill>Autofill addresses + * [1] https://wiki.mozilla.org/Firefox/Features/Form_Autofill ***/ +user_pref("extensions.formautofill.addresses.enabled", false); // [FF55+] +user_pref("extensions.formautofill.available", "off"); // [FF56+] +user_pref("extensions.formautofill.creditCards.available", false); // [FF57+] +user_pref("extensions.formautofill.creditCards.enabled", false); // [FF56+] +user_pref("extensions.formautofill.heuristics.enabled", false); // [FF55+] +/* 0810: disable coloring of visited links + * [SETUP-HARDEN] Bulk rapid history sniffing was mitigated in 2010 [1][2]. Slower and more expensive + * redraw timing attacks were largely mitigated in FF77+ [3]. Using RFP (4501) further hampers timing + * attacks. Don't forget clearing history on close (2803). However, social engineering [2#limits][4][5] + * and advanced targeted timing attacks could still produce usable results + * [1] https://developer.mozilla.org/docs/Web/CSS/Privacy_and_the_:visited_selector + * [2] https://dbaron.org/mozilla/visited-privacy + * [3] https://bugzilla.mozilla.org/1632765 + * [4] https://earthlng.github.io/testpages/visited_links.html (see github wiki APPENDIX A on how to use) + * [5] https://lcamtuf.blogspot.com/2016/08/css-mix-blend-mode-is-bad-for-keeping.html ***/ + // user_pref("layout.css.visited_links_enabled", false); -/*** [SECTION 0900]: PASSWORDS ***/ +/*** [SECTION 0900]: PASSWORDS + [1] https://support.mozilla.org/kb/use-primary-password-protect-stored-logins-and-pas +***/ user_pref("_user.js.parrot", "0900 syntax error: the parrot's expired!"); -/* 0901: disable saving passwords - * [NOTE] This does not clear any passwords already saved - * [SETTING] Privacy & Security>Logins and Passwords>Ask to save logins and passwords for websites ***/ - // user_pref("signon.rememberSignons", false); -/* 0902: use a primary password - * There are no preferences for this. It is all handled internally. - * [SETTING] Privacy & Security>Logins and Passwords>Use a Primary Password - * [1] https://support.mozilla.org/kb/use-primary-password-protect-stored-logins-and-pas ***/ -/* 0903: set how often Firefox should ask for the primary password - * 0=the first time (default), 1=every time it's needed, 2=every n minutes (see 0904) ***/ +/* 0901: set when Firefox should prompt for the primary password + * 0=once per session (default), 1=every time it's needed, 2=after n minutes (0902) ***/ user_pref("security.ask_for_password", 2); -/* 0904: set how often in minutes Firefox should ask for the primary password (see 0903) - * in minutes, default is 30 ***/ -user_pref("security.password_lifetime", 5); -/* 0905: disable auto-filling username & password form fields +/* 0902: set how long in minutes Firefox should remember the primary password (0901) ***/ +user_pref("security.password_lifetime", 5); // [DEFAULT: 30] +/* 0903: disable auto-filling username & password form fields * can leak in cross-site forms *and* be spoofed * [NOTE] Username & password is still available when you enter the field * [SETTING] Privacy & Security>Logins and Passwords>Autofill logins and passwords * [1] https://freedom-to-tinker.com/2017/12/27/no-boundaries-for-user-identities-web-trackers-exploit-browser-login-managers/ ***/ user_pref("signon.autofillForms", false); -/* 0909: disable formless login capture for Password Manager [FF51+] ***/ +/* 0904: disable formless login capture for Password Manager [FF51+] ***/ user_pref("signon.formlessCapture.enabled", false); -/* 0912: limit (or disable) HTTP authentication credentials dialogs triggered by sub-resources [FF41+] +/* 0905: limit (or disable) HTTP authentication credentials dialogs triggered by sub-resources [FF41+] * hardens against potential credentials phishing - * 0=don't allow sub-resources to open HTTP authentication credentials dialogs - * 1=don't allow cross-origin sub-resources to open HTTP authentication credentials dialogs - * 2=allow sub-resources to open HTTP authentication credentials dialogs (default) ***/ + * 0 = don't allow sub-resources to open HTTP authentication credentials dialogs + * 1 = don't allow cross-origin sub-resources to open HTTP authentication credentials dialogs + * 2 = allow sub-resources to open HTTP authentication credentials dialogs (default) ***/ user_pref("network.auth.subresource-http-auth-allow", 1); +/* 0906: enforce no automatic authentication on Microsoft sites [FF91+] [WINDOWS 10+] + * [SETTING] Privacy & Security>Logins and Passwords>Allow Windows single sign-on for... + * [1] https://support.mozilla.org/kb/windows-sso ***/ +user_pref("network.http.windows-sso.enabled", false); // [DEFAULT: false] -/*** [SECTION 1000]: CACHE / SESSION (RE)STORE / FAVICONS - Cache tracking/fingerprinting techniques [1][2][3] require a cache. Disabling disk (1001) - *and* memory (1003) caches is one solution; but that's extreme and fingerprintable. A hardened - Temporary Containers configuration can effectively do the same thing, by isolating every tab [4]. - - We consider avoiding disk cache (1001) so cache is session/memory only (like Private Browsing - mode), and isolating cache to first party (4001) is sufficient and a good balance between - risk and performance. ETAGs can also be neutralized by modifying response headers [5], and - you can clear the cache manually or on a regular basis with an extension. - - [1] https://en.wikipedia.org/wiki/HTTP_ETag#Tracking_using_ETags - [2] https://robertheaton.com/2014/01/20/cookieless-user-tracking-for-douchebags/ - [3] https://www.grepular.com/Preventing_Web_Tracking_via_the_Browser_Cache - [4] https://medium.com/@stoically/enhance-your-privacy-in-firefox-with-temporary-containers-33925cd6cd21 - [5] https://github.com/arkenfox/user.js/wiki/4.2.4-Header-Editor -***/ +/*** [SECTION 1000]: DISK AVOIDANCE ***/ user_pref("_user.js.parrot", "1000 syntax error: the parrot's gone to meet 'is maker!"); -/** CACHE ***/ /* 1001: disable disk cache - * [SETUP-PERF] If you think disk cache may help (heavy tab user, high-res video), - * or you use a hardened Temporary Containers, then feel free to override this - * [NOTE] We also clear cache on exiting Firefox (see 2803) ***/ + * [SETUP-CHROME] If you think disk cache helps perf, then feel free to override this + * [NOTE] We also clear cache on exit (2803) ***/ user_pref("browser.cache.disk.enable", false); -/* 1003: disable memory cache - * capacity: -1=determine dynamically (default), 0=none, n=memory capacity in kibibytes ***/ - // user_pref("browser.cache.memory.enable", false); - // user_pref("browser.cache.memory.capacity", 0); -/* 1006: disable permissions manager from writing to disk [RESTART] - * [NOTE] This means any permission changes are session only - * [1] https://bugzilla.mozilla.org/967812 ***/ - // user_pref("permissions.memory_only", true); // [HIDDEN PREF] -/* 1007: disable media cache from writing to disk in Private Browsing +/* 1002: disable media cache from writing to disk in Private Browsing * [NOTE] MSE (Media Source Extensions) are already stored in-memory in PB * [SETUP-WEB] ESR78: playback might break on subsequent loading (1650281) ***/ user_pref("browser.privatebrowsing.forceMediaMemoryCache", true); // [FF75+] user_pref("media.memory_cache_max_size", 65536); - -/** SESSIONS & SESSION RESTORE ***/ -/* 1020: exclude "Undo Closed Tabs" in Session Restore ***/ - // user_pref("browser.sessionstore.max_tabs_undo", 0); -/* 1021: disable storing extra session data [SETUP-CHROME] - * extra session data contains contents of forms, scrollbar positions, cookies and POST data - * define on which sites to save extra session data: +/* 1003: disable storing extra session data [SETUP-CHROME] + * define on which sites to save extra session data such as form content, cookies and POST data * 0=everywhere, 1=unencrypted sites, 2=nowhere ***/ user_pref("browser.sessionstore.privacy_level", 2); -/* 1022: disable resuming session from crash ***/ - // user_pref("browser.sessionstore.resume_from_crash", false); -/* 1023: set the minimum interval between session save operations +/* 1004: set the minimum interval between session save operations * Increasing this can help on older machines and some websites, as well as reducing writes [1] - * Default is 15000 (15 secs). Try 30000 (30 secs), 60000 (1 min) etc - * [SETUP-CHROME] This can also affect entries in the "Recently Closed Tabs" feature: - * i.e. the longer the interval the more chance a quick tab open/close won't be captured. - * This longer interval *may* affect history but we cannot replicate any history not recorded * [1] https://bugzilla.mozilla.org/1304389 ***/ -user_pref("browser.sessionstore.interval", 30000); -/* 1024: disable automatic Firefox start and session restore after reboot [FF62+] [WINDOWS] +user_pref("browser.sessionstore.interval", 30000); // [DEFAULT: 15000] +/* 1005: disable automatic Firefox start and session restore after reboot [FF62+] [WINDOWS] * [1] https://bugzilla.mozilla.org/603903 ***/ user_pref("toolkit.winRegisterApplicationRestart", false); - -/** FAVICONS ***/ -/* 1030: disable favicons in shortcuts +/* 1006: disable favicons in shortcuts * URL shortcuts use a cached randomly named .ico file which is stored in your - * profile/shortcutCache directory. The .ico remains after the shortcut is deleted. + * profile/shortcutCache directory. The .ico remains after the shortcut is deleted * If set to false then the shortcuts use a generic Firefox icon ***/ user_pref("browser.shell.shortcutFavicons", false); -/* 1031: disable favicons in history and bookmarks - * Stored as data blobs in favicons.sqlite, these don't reveal anything that your - * actual history (and bookmarks) already do. Your history is more detailed, so - * control that instead; e.g. disable history, clear history on close, use PB mode - * [NOTE] favicons.sqlite is sanitized on Firefox close, not in-session ***/ - // user_pref("browser.chrome.site_icons", false); -/* 1032: disable favicons in web notifications ***/ - // user_pref("alerts.showFavicons", false); // [DEFAULT: false] -/*** [SECTION 1200]: HTTPS (SSL/TLS / OCSP / CERTS / HPKP / CIPHERS) +/*** [SECTION 1200]: HTTPS (SSL/TLS / OCSP / CERTS / HPKP) Your cipher and other settings can be used in server side fingerprinting [TEST] https://www.ssllabs.com/ssltest/viewMyClient.html [TEST] https://browserleaks.com/ssl @@ -626,38 +478,22 @@ user_pref("_user.js.parrot", "1200 syntax error: the parrot's a stiff!"); * safe from the attack if it disables renegotiations but the problem is that the browser can't * know that. Setting this pref to true is the only way for the browser to ensure there will be * no unsafe renegotiations on the channel between the browser and the server. - * [STATS] SSL Labs (Dec 2020) reports 99.0% of sites have secure renegotiation [4] + * [STATS] SSL Labs (July 2021) reports over 99% of sites have secure renegotiation [4] * [1] https://wiki.mozilla.org/Security:Renegotiation * [2] https://tools.ietf.org/html/rfc5746 * [3] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555 * [4] https://www.ssllabs.com/ssl-pulse/ ***/ user_pref("security.ssl.require_safe_negotiation", true); -/* 1202: control TLS versions with min and max - * 1=TLS 1.0, 2=TLS 1.1, 3=TLS 1.2, 4=TLS 1.3 - * [WARNING] Leave these at default, otherwise you alter your TLS fingerprint. - * [1] https://www.ssllabs.com/ssl-pulse/ ***/ - // user_pref("security.tls.version.min", 3); // [DEFAULT: 3] - // user_pref("security.tls.version.max", 4); -/* 1203: enforce TLS 1.0 and 1.1 downgrades as session only ***/ -user_pref("security.tls.version.enable-deprecated", false); -/* 1204: disable SSL session tracking [FF36+] - * SSL Session IDs are unique and last up to 24hrs in Firefox (or longer with prolongation attacks) - * [NOTE] These are not used in PB mode. In normal windows they are isolated when using FPI (4001) - * and/or containers. In FF85+ they are isolated by default (privacy.partition.network_state) - * [WARNING] There are perf and passive fingerprinting costs, for little to no gain. Preventing - * tracking via this method does not address IPs, nor handle any sanitizing of current identifiers - * [1] https://tools.ietf.org/html/rfc5077 - * [2] https://bugzilla.mozilla.org/967977 - * [3] https://arxiv.org/abs/1810.07304 ***/ - // user_pref("security.ssl.disable_session_identifiers", true); // [HIDDEN PREF] +/* 1203: reset TLS 1.0 and 1.1 downgrades i.e. session only ***/ +user_pref("security.tls.version.enable-deprecated", false); // [DEFAULT: false] /* 1206: disable TLS1.3 0-RTT (round-trip time) [FF51+] * [1] https://github.com/tlswg/tls13-spec/issues/1001 * [2] https://blog.cloudflare.com/tls-1-3-overview-and-q-and-a/ ***/ user_pref("security.tls.enable_0rtt_data", false); /** OCSP (Online Certificate Status Protocol) - [1] https://scotthelme.co.uk/revocation-is-broken/ - [2] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/ + [1] https://scotthelme.co.uk/revocation-is-broken/ + [2] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/ ***/ /* 1211: control when to use OCSP fetching (to confirm current validity of certificates) * 0=disabled, 1=enabled (default), 2=enabled for EV certificates only @@ -677,13 +513,11 @@ user_pref("security.OCSP.require", true); /** CERTS / HPKP (HTTP Public Key Pinning) ***/ /* 1220: disable or limit SHA-1 certificates - * 0=all SHA1 certs are allowed - * 1=all SHA1 certs are blocked - * 2=deprecated option that now maps to 1 - * 3=only allowed for locally-added roots (e.g. anti-virus) - * 4=only allowed for locally-added roots or for certs in 2015 and earlier - * [SETUP-CHROME] When disabled, some man-in-the-middle devices (e.g. security scanners and - * antivirus products, may fail to connect to HTTPS sites. SHA-1 is *almost* obsolete. + * 0 = allow all + * 1 = block all + * 3 = only allow locally-added roots (e.g. anti-virus) (default) + * 4 = only allow locally-added roots or for certs in 2015 and earlier + * [SETUP-CHROME] If you have problems, update your software: SHA-1 is obsolete * [1] https://blog.mozilla.org/security/2016/10/18/phasing-out-sha-1-on-the-public-web/ ***/ user_pref("security.pki.sha1_enforcement_level", 1); /* 1221: disable Windows 8.1's Microsoft Family Safety cert [FF50+] [WINDOWS] @@ -692,18 +526,13 @@ user_pref("security.pki.sha1_enforcement_level", 1); * 2=detect Family Safety mode and import the root * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21686 ***/ user_pref("security.family_safety.mode", 0); -/* 1222: disable intermediate certificate caching (fingerprinting attack vector) [FF41+] [RESTART] - * [NOTE] This affects login/cert/key dbs. The effect is all credentials are session-only. - * Saved logins and passwords are not available. Reset the pref and restart to return them. - * [1] https://shiftordie.de/blog/2017/02/21/fingerprinting-firefox-users-with-cached-intermediate-ca-certificates-fiprinca/ ***/ - // user_pref("security.nocertdb", true); // [HIDDEN PREF] -/* 1223: enforce strict pinning +/* 1223: enable strict pinning * PKP (Public Key Pinning) 0=disabled 1=allow user MiTM (such as your antivirus), 2=strict * [SETUP-WEB] If you rely on an AV (antivirus) to protect your web browsing * by inspecting ALL your web traffic, then leave at current default=1 * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16206 ***/ user_pref("security.cert_pinning.enforcement_level", 2); -/* 1224: enforce CRLite [FF73+] +/* 1224: enable CRLite [FF73+] * In FF84+ it covers valid certs and in mode 2 doesn't fall back to OCSP * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1429800,1670985 * [2] https://blog.mozilla.org/security/tag/crlite/ ***/ @@ -711,52 +540,24 @@ user_pref("security.remote_settings.crlite_filters.enabled", true); user_pref("security.pki.crlite_mode", 2); /** MIXED CONTENT ***/ -/* 1240: enforce no insecure active content on https pages - * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21323 ***/ -user_pref("security.mixed_content.block_active_content", true); // [DEFAULT: true] /* 1241: disable insecure passive content (such as images) on https pages [SETUP-WEB] ***/ user_pref("security.mixed_content.block_display_content", true); -/* 1244: enable HTTPS-Only mode [FF76+] - * When "https_only_mode" (all windows) is true, "https_only_mode_pbm" (private windows only) is ignored - * [SETTING] to add site exceptions: Padlock>HTTPS-Only mode>On/Off/Off temporarily - * [SETTING] Privacy & Security>HTTPS-Only Mode +/* 1244: enable HTTPS-Only mode in all windows [FF76+] + * When the top-level is HTTPS, insecure subresources are also upgraded (silent fail) + * [SETTING] to add site exceptions: Padlock>HTTPS-Only mode>On (after "Continue to HTTP Site") + * [SETTING] Privacy & Security>HTTPS-Only Mode (and manage exceptions) * [TEST] http://example.com [upgrade] - * [TEST] http://neverssl.org/ [no upgrade] - * [1] https://bugzilla.mozilla.org/1613063 [META] ***/ + * [TEST] http://neverssl.com/ [no upgrade] ***/ user_pref("dom.security.https_only_mode", true); // [FF76+] // user_pref("dom.security.https_only_mode_pbm", true); // [FF80+] /* 1245: enable HTTPS-Only mode for local resources [FF77+] ***/ // user_pref("dom.security.https_only_mode.upgrade_local", true); /* 1246: disable HTTP background requests [FF82+] - * When attempting to upgrade, if the server doesn't respond within 3 seconds, firefox - * sends HTTP requests in order to check if the server supports HTTPS or not. + * When attempting to upgrade, if the server doesn't respond within 3 seconds, + * Firefox sends HTTP requests in order to check if the server supports HTTPS or not * This is done to avoid waiting for a timeout which takes 90 seconds * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1642387,1660945 ***/ user_pref("dom.security.https_only_mode_send_http_background_request", false); -/* 1247: treat .onion as a secure context [FF60+] [TOR] - * [NOTE] Firefox cannot access .onion sites by default: it is strongly recommended you just use Tor Browser - * [1] https://bugzilla.mozilla.org/1382359 ***/ - // user_pref("dom.securecontext.whitelist_onions", true); - -/** CIPHERS [WARNING: do not meddle with your cipher suite: see the section 1200 intro] - * These are all the ciphers still using SHA-1 and CBC which are weaker than the available alternatives. (see "Cipher Suites" in [1]) - * Additionally some have other weaknesses like key sizes of 128 (or lower) [2] and/or no Perfect Forward Secrecy [3]. - * [1] https://browserleaks.com/ssl - * [2] https://en.wikipedia.org/wiki/Key_size - * [3] https://en.wikipedia.org/wiki/Forward_secrecy - ***/ -/* 1261: disable 3DES (effective key size < 128 and no PFS) - * [1] https://en.wikipedia.org/wiki/3des#Security - * [2] https://en.wikipedia.org/wiki/Meet-in-the-middle_attack - * [3] https://www-archive.mozilla.org/projects/security/pki/nss/ssl/fips-ssl-ciphersuites.html ***/ - // user_pref("security.ssl3.rsa_des_ede3_sha", false); -/* 1264: disable the remaining non-modern cipher suites as of FF78 (in order of preferred by FF) ***/ - // user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha", false); - // user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false); - // user_pref("security.ssl3.ecdhe_rsa_aes_128_sha", false); - // user_pref("security.ssl3.ecdhe_rsa_aes_256_sha", false); - // user_pref("security.ssl3.rsa_aes_128_sha", false); // no PFS - // user_pref("security.ssl3.rsa_aes_256_sha", false); // no PFS /** UI (User Interface) ***/ /* 1270: display warning on the padlock for "broken security" (if 1201 is false) @@ -773,120 +574,58 @@ user_pref("browser.ssl_override_behavior", 1); * i.e. it doesn't work for HSTS discrepancies (https://subdomain.preloaded-hsts.badssl.com/) * [TEST] https://expired.badssl.com/ ***/ user_pref("browser.xul.error_pages.expert_bad_cert", true); -/* 1273: display "insecure" icon and "Not Secure" text on HTTP sites ***/ - // user_pref("security.insecure_connection_icon.enabled", true); // [FF59+] [DEFAULT: true] +/* 1273: display "Not Secure" text on HTTP sites ***/ user_pref("security.insecure_connection_text.enabled", true); // [FF60+] /*** [SECTION 1400]: FONTS ***/ user_pref("_user.js.parrot", "1400 syntax error: the parrot's bereft of life!"); -/* 1401: disable websites choosing fonts (0=block, 1=allow) - * This can limit most (but not all) JS font enumeration which is a high entropy fingerprinting vector - * [WARNING] **DO NOT USE**: in FF80+ RFP covers this, and non-RFP users should use font vis (4618) - * [SETTING] General>Language and Appearance>Fonts & Colors>Advanced>Allow pages to choose... ***/ - // user_pref("browser.display.use_document_fonts", 0); -/* 1403: disable icon fonts (glyphs) and local fallback rendering - * [1] https://bugzilla.mozilla.org/789788 - * [2] https://gitlab.torproject.org/legacy/trac/-/issues/8455 ***/ - // user_pref("gfx.downloadable_fonts.enabled", false); // [FF41+] - // user_pref("gfx.downloadable_fonts.fallback_delay", -1); -/* 1404: disable rendering of SVG OpenType fonts - * [1] https://wiki.mozilla.org/SVGOpenTypeFonts - iSECPartnersReport recommends to disable this ***/ +/* 1401: disable rendering of SVG OpenType fonts ***/ user_pref("gfx.font_rendering.opentype_svg.enabled", false); -/* 1408: disable graphite - * Graphite has had many critical security issues in the past [1] - * [1] https://www.mozilla.org/security/advisories/mfsa2017-15/#CVE-2017-7778 - * [2] https://en.wikipedia.org/wiki/Graphite_(SIL) ***/ -user_pref("gfx.font_rendering.graphite.enabled", false); -/* 1409: limit system font exposure to a whitelist [FF52+] [RESTART] - * If the whitelist is empty, then whitelisting is considered disabled and all fonts are allowed - * [NOTE] In FF81+ the whitelist **overrides** RFP's font visibility (see 4618) - * [WARNING] **DO NOT USE**: in FF80+ RFP covers this, and non-RFP users should use font vis (4618) - * [1] https://bugzilla.mozilla.org/1121643 ***/ - // user_pref("font.system.whitelist", ""); // [HIDDEN PREF] +/* 1402: limit font visibility (Windows, Mac, some Linux) [FF79+] + * [NOTE] In FF80+ RFP ignores the pref and uses value 1 + * Uses hardcoded lists with two parts: kBaseFonts + kLangPackFonts [1], bundled fonts are auto-allowed + * 1=only base system fonts, 2=also fonts from optional language packs, 3=also user-installed fonts + * [1] https://searchfox.org/mozilla-central/search?path=StandardFonts*.inc ***/ + // user_pref("layout.css.font-visibility.level", 1); /*** [SECTION 1600]: HEADERS / REFERERS - Only *cross domain* referers need controlling: leave 1601, 1602, 1605 and 1606 alone - --- - Expect some breakage: Use an extension if you need precise control - --- - full URI: https://example.com:8888/foo/bar.html?id=1234 - scheme+host+port+path: https://example.com:8888/foo/bar.html - scheme+host+port: https://example.com:8888 - --- - [1] https://feeding.cloud.geek.nz/posts/tweaking-referrer-for-privacy-in-firefox/ + Expect some breakage e.g. banks: use an extension if you need precise control + full URI: https://example.com:8888/foo/bar.html?id=1234 + scheme+host+port+path: https://example.com:8888/foo/bar.html + scheme+host+port: https://example.com:8888 + [1] https://feeding.cloud.geek.nz/posts/tweaking-referrer-for-privacy-in-firefox/ ***/ user_pref("_user.js.parrot", "1600 syntax error: the parrot rests in peace!"); -/* 1601: ALL: control when images/links send a referer - * 0=never, 1=send only when links are clicked, 2=for links and images (default) ***/ - // user_pref("network.http.sendRefererHeader", 2); -/* 1602: ALL: control the amount of information to send - * 0=send full URI (default), 1=scheme+host+port+path, 2=scheme+host+port ***/ - // user_pref("network.http.referer.trimmingPolicy", 0); -/* 1603: CROSS ORIGIN: control when to send a referer +/* 1601: control when to send a cross-origin referer * 0=always (default), 1=only if base domains match, 2=only if hosts match - * [SETUP-WEB] Known to cause issues with older modems/routers and some sites e.g vimeo, icloud ***/ + * [SETUP-WEB] Known to cause issues with older modems/routers and some sites e.g vimeo, icloud, instagram ***/ user_pref("network.http.referer.XOriginPolicy", 2); -/* 1604: CROSS ORIGIN: control the amount of information to send [FF52+] +/* 1602: control the amount of cross-origin information to send [FF52+] * 0=send full URI (default), 1=scheme+host+port+path, 2=scheme+host+port ***/ user_pref("network.http.referer.XOriginTrimmingPolicy", 2); -/* 1605: ALL: disable spoofing a referer - * [WARNING] Do not set this to true, as spoofing effectively disables the anti-CSRF - * (Cross-Site Request Forgery) protections that some sites may rely on ***/ - // user_pref("network.http.referer.spoofSource", false); // [DEFAULT: false] -/* 1606: ALL: set the default Referrer Policy [FF59+] - * 0=no-referer, 1=same-origin, 2=strict-origin-when-cross-origin, 3=no-referrer-when-downgrade - * [NOTE] This is only a default, it can be overridden by a site-controlled Referrer Policy - * [1] https://www.w3.org/TR/referrer-policy/ - * [2] https://developer.mozilla.org/docs/Web/HTTP/Headers/Referrer-Policy - * [3] https://blog.mozilla.org/security/2018/01/31/preventing-data-leaks-by-stripping-path-information-in-http-referrers/ - * [4] https://blog.mozilla.org/security/2021/03/22/firefox-87-trims-http-referrers-by-default-to-protect-user-privacy/ ***/ - // user_pref("network.http.referer.defaultPolicy", 2); // [DEFAULT: 2 FF87+] - // user_pref("network.http.referer.defaultPolicy.pbmode", 2); // [DEFAULT: 2] -/* 1607: hide (not spoof) referrer when leaving a .onion domain [FF54+] [TOR] - * [NOTE] Firefox cannot access .onion sites by default: it is strongly recommended you just use Tor Browser - * [1] https://bugzilla.mozilla.org/1305144 ***/ - // user_pref("network.http.referer.hideOnionSource", true); -/* 1610: ALL: enable the DNT (Do Not Track) HTTP header - * [NOTE] DNT is enforced with Enhanced Tracking Protection regardless of this pref +/* 1603: enable the DNT (Do Not Track) HTTP header + * [NOTE] DNT is enforced with Enhanced Tracking Protection (2710) * [SETTING] Privacy & Security>Enhanced Tracking Protection>Send websites a "Do Not Track" signal... ***/ -user_pref("privacy.donottrackheader.enabled", true); + // user_pref("privacy.donottrackheader.enabled", true); /*** [SECTION 1700]: CONTAINERS - If you want to *really* leverage containers, we highly recommend Temporary Containers [2]. - Read the article by the extension author [3], and check out the github wiki/repo [4]. - [1] https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers - [2] https://addons.mozilla.org/firefox/addon/temporary-containers/ - [3] https://medium.com/@stoically/enhance-your-privacy-in-firefox-with-temporary-containers-33925cd6cd21 - [4] https://github.com/stoically/temporary-containers/wiki + Check out Temporary Containers [2], read the article [3], and visit the wiki/repo [4] + [1] https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers + [2] https://addons.mozilla.org/firefox/addon/temporary-containers/ + [3] https://medium.com/@stoically/enhance-your-privacy-in-firefox-with-temporary-containers-33925cd6cd21 + [4] https://github.com/stoically/temporary-containers/wiki ***/ user_pref("_user.js.parrot", "1700 syntax error: the parrot's bit the dust!"); -/* 1701: enable Container Tabs setting in preferences (see 1702) [FF50+] - * [1] https://bugzilla.mozilla.org/1279029 ***/ -user_pref("privacy.userContext.ui.enabled", true); -/* 1702: enable Container Tabs [FF50+] +/* 1701: enable Container Tabs and its UI setting [FF50+] * [SETTING] General>Tabs>Enable Container Tabs ***/ user_pref("privacy.userContext.enabled", true); -/* 1703: set behaviour on "+ Tab" button to display container menu on left click [FF74+] +user_pref("privacy.userContext.ui.enabled", true); +/* 1702: set behaviour on "+ Tab" button to display container menu on left click [FF74+] * [NOTE] The menu is always shown on long press and right click * [SETTING] General>Tabs>Enable Container Tabs>Settings>Select a container for each new tab ***/ // user_pref("privacy.userContext.newTabContainerOnLeftClick.enabled", true); -/*** [SECTION 1800]: PLUGINS ***/ -user_pref("_user.js.parrot", "1800 syntax error: the parrot's pushing up daisies!"); -/* 1820: disable GMP (Gecko Media Plugins) - * [1] https://wiki.mozilla.org/GeckoMediaPlugins ***/ - // user_pref("media.gmp-provider.enabled", false); -/* 1825: disable widevine CDM (Content Decryption Module) - * [NOTE] This is covered by the EME master switch (1830) ***/ - // user_pref("media.gmp-widevinecdm.enabled", false); -/* 1830: disable all DRM content (EME: Encryption Media Extension) - * [SETUP-WEB] e.g. Netflix, Amazon Prime, Hulu, HBO, Disney+, Showtime, Starz, DirectTV - * [SETTING] General>DRM Content>Play DRM-controlled content - * [TEST] https://bitmovin.com/demos/drm - * [1] https://www.eff.org/deeplinks/2017/10/drms-dead-canary-how-we-just-lost-web-what-we-learned-it-and-what-we-need-do-next ***/ -user_pref("media.eme.enabled", false); - -/*** [SECTION 2000]: MEDIA / CAMERA / MIC ***/ +/*** [SECTION 2000]: PLUGINS / MEDIA / WEBRTC ***/ user_pref("_user.js.parrot", "2000 syntax error: the parrot's snuffed it!"); /* 2001: disable WebRTC (Web Real-Time Communication) * [SETUP-WEB] WebRTC can leak your IP address from behind your VPN, but if this is not @@ -902,197 +641,83 @@ user_pref("media.peerconnection.enabled", false); user_pref("media.peerconnection.ice.default_address_only", true); user_pref("media.peerconnection.ice.no_host", true); // [FF51+] user_pref("media.peerconnection.ice.proxy_only_if_behind_proxy", true); // [FF70+] -/* 2010: disable WebGL (Web Graphics Library) - * [SETUP-WEB] When disabled, may break some websites. When enabled, provides high entropy, - * especially with readPixels(). Some of the other entropy is lessened with RFP (see 4501) - * [1] https://www.contextis.com/resources/blog/webgl-new-dimension-browser-exploitation/ - * [2] https://security.stackexchange.com/questions/13799/is-webgl-a-security-concern ***/ -user_pref("webgl.disabled", true); -user_pref("webgl.enable-webgl2", false); -/* 2012: limit WebGL ***/ -user_pref("webgl.disable-fail-if-major-performance-caveat", true); // [DEFAULT: true FF86+] -/* 2022: disable screensharing ***/ -user_pref("media.getusermedia.screensharing.enabled", false); -user_pref("media.getusermedia.browser.enabled", false); -user_pref("media.getusermedia.audiocapture.enabled", false); -/* 2024: set a default permission for Camera/Microphone [FF58+] - * 0=always ask (default), 1=allow, 2=block - * [SETTING] to add site exceptions: Ctrl+I>Permissions>Use the Camera/Microphone - * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Camera/Microphone>Settings ***/ - // user_pref("permissions.default.camera", 2); - // user_pref("permissions.default.microphone", 2); +/* 2020: disable GMP (Gecko Media Plugins) + * [1] https://wiki.mozilla.org/GeckoMediaPlugins ***/ + // user_pref("media.gmp-provider.enabled", false); +/* 2021: disable widevine CDM (Content Decryption Module) + * [NOTE] This is covered by the EME master switch (2022) ***/ + // user_pref("media.gmp-widevinecdm.enabled", false); +/* 2022: disable all DRM content (EME: Encryption Media Extension) + * [SETUP-WEB] e.g. Netflix, Amazon Prime, Hulu, HBO, Disney+, Showtime, Starz, DirectTV + * [SETTING] General>DRM Content>Play DRM-controlled content + * [TEST] https://bitmovin.com/demos/drm + * [1] https://www.eff.org/deeplinks/2017/10/drms-dead-canary-how-we-just-lost-web-what-we-learned-it-and-what-we-need-do-next ***/ +user_pref("media.eme.enabled", false); /* 2030: disable autoplay of HTML5 media [FF63+] - * 0=Allow all, 1=Block non-muted media (default in FF67+), 2=Prompt (removed in FF66), 5=Block all (FF69+) + * 0=Allow all, 1=Block non-muted media (default), 5=Block all * [NOTE] You can set exceptions under site permissions * [SETTING] Privacy & Security>Permissions>Autoplay>Settings>Default for all websites ***/ // user_pref("media.autoplay.default", 5); /* 2031: disable autoplay of HTML5 media if you interacted with the site [FF78+] * 0=sticky (default), 1=transient, 2=user * Firefox's Autoplay Policy Documentation [PDF] is linked below via SUMO - * [NOTE] If you have trouble with some video sites, then add an exception (see 2030) + * [NOTE] If you have trouble with some video sites, then add an exception (2030) * [1] https://support.mozilla.org/questions/1293231 ***/ user_pref("media.autoplay.blocking_policy", 2); -/*** [SECTION 2200]: WINDOW MEDDLING & LEAKS / POPUPS ***/ -user_pref("_user.js.parrot", "2200 syntax error: the parrot's 'istory!"); -/* 2202: prevent scripts from moving and resizing open windows ***/ -user_pref("dom.disable_window_move_resize", true); -/* 2203: open links targeting new windows in a new tab instead - * This stops malicious window sizes and some screen resolution leaks. - * You can still right-click a link and open in a new window. - * [TEST] https://arkenfox.github.io/TZP/tzp.html#screen - * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/9881 ***/ -user_pref("browser.link.open_newwindow", 3); // 1=most recent window or tab 2=new window, 3=new tab -user_pref("browser.link.open_newwindow.restriction", 0); -/* 2204: disable Fullscreen API (requires user interaction) to prevent screen-resolution leaks - * [NOTE] You can still manually toggle the browser's fullscreen state (F11), - * but this pref will disable embedded video/game fullscreen controls, e.g. youtube - * [TEST] https://arkenfox.github.io/TZP/tzp.html#screen ***/ - // user_pref("full-screen-api.enabled", false); -/* 2210: block popup windows - * [SETTING] Privacy & Security>Permissions>Block pop-up windows ***/ -user_pref("dom.disable_open_during_load", true); -/* 2212: limit events that can cause a popup [SETUP-WEB] - * default FF86+: "change click dblclick auxclick mousedown mouseup pointerdown pointerup notificationclick reset submit touchend contextmenu ***/ -user_pref("dom.popup_allowed_events", "click dblclick mousedown pointerdown"); - /*** [SECTION 2300]: WEB WORKERS - A worker is a JS "background task" running in a global context, i.e. it is different from - the current window. Workers can spawn new workers (must be the same origin & scheme), - including service and shared workers. Shared workers can be utilized by multiple scripts and - communicate between browsing contexts (windows/tabs/iframes) and can even control your cache. + A worker is a JS "background task" running in a global context, i.e. it is different from + the current window. Workers can spawn new workers (must be the same origin & scheme), + including service and shared workers. Shared workers can be utilized by multiple scripts and + communicate between browsing contexts (windows/tabs/iframes) and can even control your cache. - [1] Web Workers: https://developer.mozilla.org/docs/Web/API/Web_Workers_API - [2] Worker: https://developer.mozilla.org/docs/Web/API/Worker - [3] Service Worker: https://developer.mozilla.org/docs/Web/API/Service_Worker_API - [4] SharedWorker: https://developer.mozilla.org/docs/Web/API/SharedWorker - [5] ChromeWorker: https://developer.mozilla.org/docs/Web/API/ChromeWorker - [6] Notifications: https://support.mozilla.org/questions/1165867#answer-981820 + [1] Web Workers: https://developer.mozilla.org/docs/Web/API/Web_Workers_API + [2] Worker: https://developer.mozilla.org/docs/Web/API/Worker + [3] Service Worker: https://developer.mozilla.org/docs/Web/API/Service_Worker_API + [4] SharedWorker: https://developer.mozilla.org/docs/Web/API/SharedWorker + [5] ChromeWorker: https://developer.mozilla.org/docs/Web/API/ChromeWorker + [6] Notifications: https://support.mozilla.org/questions/1165867#answer-981820 ***/ user_pref("_user.js.parrot", "2300 syntax error: the parrot's off the twig!"); /* 2302: disable service workers [FF32, FF44-compat] * Service workers essentially act as proxy servers that sit between web apps, and the - * browser and network, are event driven, and can control the web page/site it is associated + * browser and network, are event driven, and can control the web page/site they are associated * with, intercepting and modifying navigation and resource requests, and caching resources. - * [NOTE] Service worker APIs are hidden (in Firefox) and cannot be used when in PB mode. - * [NOTE] Service workers only run over HTTPS. Service workers have no DOM access. + * [NOTE] Service workers require HTTPS, have no DOM access, and are not supported in PB mode [1] * [SETUP-WEB] Disabling service workers will break some sites. This pref is required true for * service worker notifications (2304), push notifications (disabled, 2305) and service worker - * cache (2740). If you enable this pref, then check those settings as well ***/ + * cache (2740). If you enable this pref, then check those settings as well + * [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1320796#c7 ***/ user_pref("dom.serviceWorkers.enabled", false); /* 2304: disable Web Notifications - * [NOTE] Web Notifications can also use service workers (2302) and are behind a prompt (2306) + * [NOTE] Web Notifications can also use service workers (2302) and are behind a prompt (7002) * [1] https://developer.mozilla.org/docs/Web/API/Notifications_API ***/ // user_pref("dom.webnotifications.enabled", false); // [FF22+] // user_pref("dom.webnotifications.serviceworker.enabled", false); // [FF44+] /* 2305: disable Push Notifications [FF44+] * Push is an API that allows websites to send you (subscribed) messages even when the site - * isn't loaded, by pushing messages to your userAgentID through Mozilla's Push Server. + * isn't loaded, by pushing messages to your userAgentID through Mozilla's Push Server * [NOTE] Push requires service workers (2302) to subscribe to and display, and is behind - * a prompt (2306). Disabling service workers alone doesn't stop Firefox polling the - * Mozilla Push Server. To remove all subscriptions, reset your userAgentID (in about:config - * or on start), and you will get a new one within a few seconds. - * [1] https://support.mozilla.org/en-US/kb/push-notifications-firefox - * [2] https://developer.mozilla.org/en-US/docs/Web/API/Push_API ***/ + * a prompt (7002). Disabling service workers alone doesn't stop Firefox polling the + * Mozilla Push Server. To remove all subscriptions, reset your userAgentID. + * [1] https://support.mozilla.org/kb/push-notifications-firefox + * [2] https://developer.mozilla.org/docs/Web/API/Push_API ***/ user_pref("dom.push.enabled", false); // user_pref("dom.push.userAgentID", ""); -/* 2306: set a default permission for Notifications (both 2304 and 2305) [FF58+] - * 0=always ask (default), 1=allow, 2=block - * [NOTE] Best left at default "always ask", fingerprintable via Permissions API - * [SETTING] to add site exceptions: Ctrl+I>Permissions>Receive Notifications - * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Notifications>Settings ***/ - // user_pref("permissions.default.desktop-notification", 2); -/*** [SECTION 2400]: DOM (DOCUMENT OBJECT MODEL) & JAVASCRIPT ***/ +/*** [SECTION 2400]: DOM (DOCUMENT OBJECT MODEL) ***/ user_pref("_user.js.parrot", "2400 syntax error: the parrot's kicked the bucket!"); -/* 2401: disable website control over browser right-click context menu - * [NOTE] Shift-Right-Click will always bring up the browser right-click context menu ***/ - // user_pref("dom.event.contextmenu.enabled", false); -/* 2402: disable website access to clipboard events/content [SETUP-HARDEN] - * [NOTE] This will break some sites' functionality e.g. Outlook, Twitter, Facebook, Wordpress - * This applies to onCut/onCopy/onPaste events - i.e. it requires interaction with the website - * [WARNING] In FF88 or lower, with clipboardevents enabled, if both 'middlemouse.paste' and - * 'general.autoScroll' are true (at least one is default false) then the clipboard can leak [1] - * [1] https://bugzilla.mozilla.org/1528289 ***/ - // user_pref("dom.event.clipboardevents.enabled", false); -/* 2404: disable clipboard commands (cut/copy) from "non-privileged" content [FF41+] - * this disables document.execCommand("cut"/"copy") to protect your clipboard - * [1] https://bugzilla.mozilla.org/1170911 ***/ -user_pref("dom.allow_cut_copy", false); -/* 2405: disable "Confirm you want to leave" dialog on page close - * Does not prevent JS leaks of the page close event. - * [1] https://developer.mozilla.org/docs/Web/Events/beforeunload - * [2] https://support.mozilla.org/questions/1043508 ***/ +/* 2401: disable "Confirm you want to leave" dialog on page close + * Does not prevent JS leaks of the page close event + * [1] https://developer.mozilla.org/docs/Web/Events/beforeunload ***/ user_pref("dom.disable_beforeunload", true); -/* 2414: disable shaking the screen ***/ -user_pref("dom.vibrator.enabled", false); -/* 2420: disable asm.js [FF22+] [SETUP-PERF] - * [1] http://asmjs.org/ - * [2] https://www.mozilla.org/security/advisories/mfsa2015-29/ - * [3] https://www.mozilla.org/security/advisories/mfsa2015-50/ - * [4] https://www.mozilla.org/security/advisories/mfsa2017-01/#CVE-2017-5375 - * [5] https://www.mozilla.org/security/advisories/mfsa2017-05/#CVE-2017-5400 - * [6] https://rh0dev.github.io/blog/2017/the-return-of-the-jit/ ***/ -user_pref("javascript.options.asmjs", false); -/* 2421: disable Ion and baseline JIT to harden against JS exploits [SETUP-HARDEN] - * [NOTE] In FF75+, when **both** Ion and JIT are disabled, **and** the new - * hidden pref is enabled, then Ion can still be used by extensions (1599226) - * [WARNING] Disabling Ion/JIT can cause some site issues and performance loss - * [1] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-0817 ***/ - // user_pref("javascript.options.ion", false); - // user_pref("javascript.options.baselinejit", false); - // user_pref("javascript.options.jit_trustedprincipals", true); // [FF75+] [HIDDEN PREF] -/* 2422: disable WebAssembly [FF52+] - * Vulnerabilities have increasingly been found, including those known and fixed - * in native programs years ago [2]. WASM has powerful low-level access, making - * certain attacks (brute-force) and vulnerabilities more possible - * [STATS] ~0.2% of websites, about half of which are for crytopmining / malvertising [2][3] - * [1] https://developer.mozilla.org/docs/WebAssembly - * [2] https://spectrum.ieee.org/tech-talk/telecom/security/more-worries-over-the-security-of-web-assembly - * [3] https://www.zdnet.com/article/half-of-the-websites-using-webassembly-use-it-for-malicious-purposes ***/ -user_pref("javascript.options.wasm", false); -/* 2429: enable (limited but sufficient) window.opener protection [FF65+] - * Makes rel=noopener implicit for target=_blank in anchor and area elements when no rel attribute is set ***/ -user_pref("dom.targetBlankNoOpener.enabled", true); // [DEFAULT: true FF79+] - -/*** [SECTION 2500]: HARDWARE FINGERPRINTING ***/ -user_pref("_user.js.parrot", "2500 syntax error: the parrot's shuffled off 'is mortal coil!"); -/* 2502: disable Battery Status API - * Initially a Linux issue (high precision readout) that was fixed. - * However, it is still another metric for fingerprinting, used to raise entropy. - * e.g. do you have a battery or not, current charging status, charge level, times remaining etc - * [NOTE] From FF52+ Battery Status API is only available in chrome/privileged code [1] - * [1] https://bugzilla.mozilla.org/1313580 ***/ - // user_pref("dom.battery.enabled", false); -/* 2505: disable media device enumeration [FF29+] - * [NOTE] media.peerconnection.enabled should also be set to false (see 2001) - * [1] https://wiki.mozilla.org/Media/getUserMedia - * [2] https://developer.mozilla.org/docs/Web/API/MediaDevices/enumerateDevices ***/ -user_pref("media.navigator.enabled", false); -/* 2508: disable hardware acceleration to reduce graphics fingerprinting [SETUP-HARDEN] - * [WARNING] Affects text rendering (fonts will look different), impacts video performance, - * and parts of Quantum that utilize the GPU will also be affected as they are rolled out - * [SETTING] General>Performance>Custom>Use hardware acceleration when available - * [1] https://wiki.mozilla.org/Platform/GFX/HardwareAcceleration ***/ - // user_pref("gfx.direct2d.disabled", true); // [WINDOWS] - // user_pref("layers.acceleration.disabled", true); -/* 2510: disable Web Audio API [FF51+] - * [1] https://bugzilla.mozilla.org/1288359 ***/ -user_pref("dom.webaudio.enabled", false); -/* 2517: disable Media Capabilities API [FF63+] - * [WARNING] This *may* affect media performance if disabled, no one is sure - * [1] https://github.com/WICG/media-capabilities - * [2] https://wicg.github.io/media-capabilities/#security-privacy-considerations ***/ - // user_pref("media.media-capabilities.enabled", false); -/* 2520: disable virtual reality devices - * Optional protection depending on your connected devices - * [1] https://developer.mozilla.org/docs/Web/API/WebVR_API ***/ - // user_pref("dom.vr.enabled", false); -/* 2521: set a default permission for Virtual Reality (see 2520) [FF73+] - * 0=always ask (default), 1=allow, 2=block - * [SETTING] to add site exceptions: Ctrl+I>Permissions>Access Virtual Reality Devices - * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Virtual Reality>Settings ***/ - // user_pref("permissions.default.xr", 2); +/* 2402: prevent scripts from moving and resizing open windows ***/ +user_pref("dom.disable_window_move_resize", true); +/* 2403: block popup windows + * [SETTING] Privacy & Security>Permissions>Block pop-up windows ***/ +user_pref("dom.disable_open_during_load", true); +/* 2404: limit events that can cause a popup [SETUP-WEB] ***/ +user_pref("dom.popup_allowed_events", "click dblclick mousedown pointerdown"); /*** [SECTION 2600]: MISCELLANEOUS ***/ user_pref("_user.js.parrot", "2600 syntax error: the parrot's run down the curtain!"); @@ -1118,14 +743,6 @@ user_pref("devtools.chrome.enabled", false); /* 2608: reset remote debugging to disabled * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16222 ***/ user_pref("devtools.debugger.remote-enabled", false); // [DEFAULT: false] -/* 2609: disable MathML (Mathematical Markup Language) [FF51+] [SETUP-HARDEN] - * [TEST] https://arkenfox.github.io/TZP/tzp.html#misc - * [1] https://bugzilla.mozilla.org/1173199 ***/ - // user_pref("mathml.disabled", true); -/* 2610: disable in-content SVG (Scalable Vector Graphics) [FF53+] - * [WARNING] Expect breakage incl. youtube player controls. Best left for a "hardened" profile. - * [1] https://bugzilla.mozilla.org/1216893 ***/ - // user_pref("svg.disabled", true); /* 2611: disable middle mouse click opening links from clipboard * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/10089 ***/ user_pref("middlemouse.contentLoadURL", false); @@ -1138,99 +755,70 @@ user_pref("middlemouse.contentLoadURL", false); user_pref("permissions.manager.defaultsUrl", ""); /* 2617: remove webchannel whitelist ***/ user_pref("webchannel.allowObject.urlWhitelist", ""); -/* 2619: enforce Punycode for Internationalized Domain Names to eliminate possible spoofing - * Firefox has *some* protections, but it is better to be safe than sorry +/* 2619: use Punycode in Internationalized Domain Names to eliminate possible spoofing * [SETUP-WEB] Might be undesirable for non-latin alphabet users since legitimate IDN's are also punycoded * [TEST] https://www.xn--80ak6aa92e.com/ (www.apple.com) * [1] https://wiki.mozilla.org/IDN_Display_Algorithm * [2] https://en.wikipedia.org/wiki/IDN_homograph_attack - * [3] CVE-2017-5383: https://www.mozilla.org/security/advisories/mfsa2017-02/ + * [3] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=punycode+firefox * [4] https://www.xudongz.com/blog/2017/idn-phishing/ ***/ user_pref("network.IDN_show_punycode", true); /* 2620: enforce PDFJS, disable PDFJS scripting [SETUP-CHROME] * This setting controls if the option "Display in Firefox" is available in the setting below * and by effect controls whether PDFs are handled in-browser or externally ("Ask" or "Open With") - * PROS: pdfjs is lightweight, open source, and as secure/vetted as any pdf reader out there (more than most) + * PROS: pdfjs is lightweight, open source, and more secure/vetted than most * Exploits are rare (one serious case in seven years), treated seriously and patched quickly. * It doesn't break "state separation" of browser content (by not sharing with OS, independent apps). * It maintains disk avoidance and application data isolation. It's convenient. You can still save to disk. * CONS: You may prefer a different pdf reader for security reasons - * CAVEAT: JS can still force a pdf to open in-browser by bundling its own code (rare) + * CAVEAT: JS can still force a pdf to open in-browser by bundling its own code * [SETTING] General>Applications>Portable Document Format (PDF) ***/ user_pref("pdfjs.disabled", false); // [DEFAULT: false] user_pref("pdfjs.enableScripting", false); // [FF86+] /* 2621: disable links launching Windows Store on Windows 8/8.1/10 [WINDOWS] ***/ user_pref("network.protocol-handler.external.ms-windows-store", false); -/* 2622: enforce no system colors; they can be fingerprinted - * [SETTING] General>Language and Appearance>Fonts and Colors>Colors>Use system colors ***/ -user_pref("browser.display.use_system_colors", false); // [DEFAULT: false] /* 2623: disable permissions delegation [FF73+] * Currently applies to cross-origin geolocation, camera, mic and screen-sharing * permissions, and fullscreen requests. Disabling delegation means any prompts * for these will show/use their correct 3rd party origin * [1] https://groups.google.com/forum/#!topic/mozilla.dev.platform/BdFOMAuCGW8/discussion ***/ user_pref("permissions.delegation.enabled", false); -/* 2624: enable "window.name" protection [FF82+] - * If a new page from another domain is loaded into a tab, then window.name is set to an empty string. The original - * string is restored if the tab reverts back to the original page. This change prevents some cross-site attacks - * [TEST] https://arkenfox.github.io/TZP/tests/windownamea.html ***/ -user_pref("privacy.window.name.update.enabled", true); // [DEFAULT: true FF86+] -/* 2625: disable bypassing 3rd party extension install prompts [FF82+] - * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1659530,1681331 ***/ -user_pref("extensions.postDownloadThirdPartyPrompt", false); /** DOWNLOADS ***/ -/* 2650: discourage downloading to desktop - * 0=desktop, 1=downloads (default), 2=last used - * [SETTING] To set your default "downloads": General>Downloads>Save files to ***/ - // user_pref("browser.download.folderList", 2); -/* 2651: enforce user interaction for security by always asking where to download +/* 2651: enable user interaction for security by always asking where to download * [SETUP-CHROME] On Android this blocks longtapping and saving images * [SETTING] General>Downloads>Always ask you where to save files ***/ user_pref("browser.download.useDownloadDir", false); /* 2652: disable adding downloads to the system's "recent documents" list ***/ user_pref("browser.download.manager.addToRecentDocs", false); -/* 2654: disable "open with" in download dialog [FF50+] [SETUP-HARDEN] - * This is very useful to enable when the browser is sandboxed (e.g. via AppArmor) - * in such a way that it is forbidden to run external applications. - * [WARNING] This may interfere with some users' workflow or methods - * [1] https://bugzilla.mozilla.org/1281959 ***/ - // user_pref("browser.download.forbid_open_with", true); /** EXTENSIONS ***/ /* 2660: lock down allowed extension directories * [SETUP-CHROME] This will break extensions, language packs, themes and any other * XPI files which are installed outside of profile and application directories * [1] https://mike.kaply.com/2012/02/21/understanding-add-on-scopes/ - * [1] archived: https://archive.is/DYjAM ***/ + * [1] https://archive.is/DYjAM (archived) ***/ user_pref("extensions.enabledScopes", 5); // [HIDDEN PREF] user_pref("extensions.autoDisableScopes", 15); // [DEFAULT: 15] +/* 2661: disable bypassing 3rd party extension install prompts [FF82+] + * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1659530,1681331 ***/ +user_pref("extensions.postDownloadThirdPartyPrompt", false); /* 2662: disable webextension restrictions on certain mozilla domains (you also need 4503) [FF60+] * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/ // user_pref("extensions.webextensions.restrictedDomains", ""); -/** SECURITY ***/ -/* 2680: enforce CSP (Content Security Policy) - * [WARNING] CSP is a very important and widespread security feature. Don't disable it! - * [1] https://developer.mozilla.org/docs/Web/HTTP/CSP ***/ -user_pref("security.csp.enable", true); // [DEFAULT: true] -/* 2684: enforce a security delay on some confirmation dialogs such as install, open/save - * [1] https://www.squarefree.com/2004/07/01/race-conditions-in-security-dialogs/ ***/ -user_pref("security.dialog_enable_delay", 700); - /*** [SECTION 2700]: PERSISTENT STORAGE - Data SET by websites including - cookies : profile\cookies.sqlite - localStorage : profile\webappsstore.sqlite - indexedDB : profile\storage\default - appCache : profile\OfflineCache - serviceWorkers : + Data SET by websites including + cookies : profile\cookies.sqlite + localStorage : profile\webappsstore.sqlite + indexedDB : profile\storage\default + serviceWorkers : - [NOTE] indexedDB and serviceWorkers are not available in Private Browsing Mode - [NOTE] Blocking cookies also blocks websites access to: localStorage (incl. sessionStorage), - indexedDB, sharedWorker, and serviceWorker (and therefore service worker cache and notifications) - If you set a site exception for cookies (either "Allow" or "Allow for Session") then they become - accessible to websites except shared/service workers where the cookie setting *must* be "Allow" + [NOTE] indexedDB and serviceWorkers are not available in Private Browsing Mode + [NOTE] Blocking cookies also blocks websites access to: localStorage (incl. sessionStorage), + indexedDB, sharedWorker, and serviceWorker (and therefore service worker cache and notifications) + If you set a site exception for cookies (either "Allow" or "Allow for Session") then they become + accessible to websites except shared/service workers where the cookie setting must be "Allow" ***/ user_pref("_user.js.parrot", "2700 syntax error: the parrot's joined the bleedin' choir invisible!"); /* 2701: disable or isolate 3rd-party cookies and site-data [SETUP-WEB] @@ -1267,16 +855,8 @@ user_pref("privacy.trackingprotection.enabled", true); user_pref("privacy.trackingprotection.socialtracking.enabled", true); // user_pref("privacy.trackingprotection.cryptomining.enabled", true); // [DEFAULT: true] // user_pref("privacy.trackingprotection.fingerprinting.enabled", true); // [DEFAULT: true] -/* 2720: disable DOM (Document Object Model) Storage - * [WARNING] This will break a LOT of sites' functionality AND extensions! - * You are better off using an extension for more granular control ***/ - // user_pref("dom.storage.enabled", false); -/* 2730: enforce no offline cache storage (appCache) - * The API is easily fingerprinted, use the "storage" pref instead ***/ - // user_pref("browser.cache.offline.enable", false); -user_pref("browser.cache.offline.storage.enable", false); // [FF71+] [DEFAULT: false FF84+] /* 2740: disable service worker cache and cache storage - * [NOTE] We clear service worker cache on exiting Firefox (see 2803) + * [NOTE] We clear service worker cache on exit (2803) * [1] https://w3c.github.io/ServiceWorker/#privacy ***/ // user_pref("dom.caches.enabled", false); /* 2750: disable Storage API [FF51+] @@ -1288,28 +868,28 @@ user_pref("browser.cache.offline.storage.enable", false); // [FF71+] [DEFAULT: f * [3] https://blog.mozilla.org/l10n/2017/03/07/firefox-l10n-report-aurora-54/ ***/ // user_pref("dom.storageManager.enabled", false); /* 2755: disable Storage Access API [FF65+] - * [1] https://developer.mozilla.org/en-US/docs/Web/API/Storage_Access_API ***/ + * [1] https://developer.mozilla.org/docs/Web/API/Storage_Access_API ***/ // user_pref("dom.storage_access.enabled", false); /* 2760: enable Local Storage Next Generation (LSNG) [FF65+] ***/ -user_pref("dom.storage.next_gen", true); +user_pref("dom.storage.next_gen", true); // [DEFAULT: true FF92+] /*** [SECTION 2800]: SHUTDOWN - You should set the values to what suits you best. - - "Offline Website Data" includes appCache (2730), localStorage (2720), - service worker cache (2740), and QuotaManager (IndexedDB, asm-cache) - - In both 2803 + 2804, the 'download' and 'history' prefs are combined in the - Firefox interface as "Browsing & Download History" and their values will be synced + * Sanitizing on shutdown is all or nothing. It does not use Managed Exceptions under + Privacy & Security>Delete cookies and site data when Firefox is closed (1681701) + * If you want to keep some sites' cookies (exception as "Allow") and optionally other site + data but clear all the rest on close, then you need to set the "cookie" and optionally the + "offlineApps" prefs below to false, and to set the cookie lifetime pref to 2 (2703) ***/ user_pref("_user.js.parrot", "2800 syntax error: the parrot's bleedin' demised!"); -/* 2802: enable Firefox to clear items on shutdown (see 2803) +/* 2802: enable Firefox to clear items on shutdown (2803) * [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes ***/ user_pref("privacy.sanitize.sanitizeOnShutdown", true); /* 2803: set what items to clear on shutdown (if 2802 is true) [SETUP-CHROME] - * [NOTE] If 'history' is true, downloads will also be cleared regardless of the value - * but if 'history' is false, downloads can still be cleared independently - * However, this may not always be the case. The interface combines and syncs these - * prefs when set from there, and the sanitize code may change at any time - * [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes>Settings ***/ + * [NOTE] If "history" is true, downloads will also be cleared + * [NOTE] Active Logins: does not refer to logins via cookies, but rather HTTP Basic Authentication [1] + * [NOTE] Offline Website Data: localStorage, service worker cache, QuotaManager (IndexedDB, asm-cache) + * [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes>Settings + * [1] https://en.wikipedia.org/wiki/Basic_access_authentication ***/ user_pref("privacy.clearOnShutdown.cache", true); user_pref("privacy.clearOnShutdown.cookies", true); user_pref("privacy.clearOnShutdown.downloads", true); // see note above @@ -1320,9 +900,9 @@ user_pref("privacy.clearOnShutdown.sessions", true); // Active Logins user_pref("privacy.clearOnShutdown.siteSettings", false); // Site Preferences /* 2804: reset default items to clear with Ctrl-Shift-Del (to match 2803) [SETUP-CHROME] * This dialog can also be accessed from the menu History>Clear Recent History - * Firefox remembers your last choices. This will reset them when you start Firefox. - * [NOTE] Regardless of what you set privacy.cpd.downloads to, as soon as the dialog - * for "Clear Recent History" is opened, it is synced to the same as 'history' ***/ + * Firefox remembers your last choices. This will reset them when you start Firefox + * [NOTE] Regardless of what you set "downloads" to, as soon as the dialog + * for "Clear Recent History" is opened, it is synced to the same as "history" ***/ user_pref("privacy.cpd.cache", true); user_pref("privacy.cpd.cookies", true); // user_pref("privacy.cpd.downloads", true); // not used, see note above @@ -1333,17 +913,16 @@ user_pref("privacy.cpd.passwords", false); // this is not listed user_pref("privacy.cpd.sessions", true); // Active Logins user_pref("privacy.cpd.siteSettings", false); // Site Preferences /* 2805: clear Session Restore data when sanitizing on shutdown or manually [FF34+] - * [NOTE] Not needed if Session Restore is not used (see 0102) or is already cleared with history (see 2803) - * [NOTE] privacy.clearOnShutdown.openWindows prevents resuming from crashes (see 1022) + * [NOTE] Not needed if Session Restore is not used (0102) or is already cleared with history (2803) + * [NOTE] privacy.clearOnShutdown.openWindows prevents resuming from crashes (also see 5008) * [NOTE] privacy.cpd.openWindows has a bug that causes an additional window to open ***/ // user_pref("privacy.clearOnShutdown.openWindows", true); // user_pref("privacy.cpd.openWindows", true); -/* 2806: reset default 'Time range to clear' for 'Clear Recent History' (see 2804) - * Firefox remembers your last choice. This will reset the value when you start Firefox. - * 0=everything, 1=last hour, 2=last two hours, 3=last four hours, - * 4=today, 5=last five minutes, 6=last twenty-four hours - * [NOTE] The values 5 + 6 are not listed in the dropdown, which will display a - * blank value if they are used, but they do work as advertised ***/ +/* 2806: reset default "Time range to clear" for "Clear Recent History" (2804) + * Firefox remembers your last choice. This will reset the value when you start Firefox + * 0=everything, 1=last hour, 2=last two hours, 3=last four hours, 4=today + * [NOTE] Values 5 (last 5 minutes) and 6 (last 24 hours) are not listed in the dropdown, + * which will display a blank value, and are not guaranteed to work ***/ user_pref("privacy.sanitize.timeSpan", 0); /*** [SECTION 4000]: FPI (FIRST PARTY ISOLATION) @@ -1360,106 +939,97 @@ user_pref("privacy.sanitize.timeSpan", 0); 1344170 - blob: URI (FF55+) 1300671 - data:, about: URLs (FF55+) 1473247 - IP addresses (FF63+) - 1492607 - postMessage with targetOrigin "*" (requires 4002) (FF65+) 1542309 - top-level domain URLs when host is in the public suffix list (FF68+) 1506693 - pdfjs range-based requests (FF68+) 1330467 - site permissions (FF69+) 1534339 - IPv6 (FF73+) + 1721858 - WebSocket (FF92+) ***/ user_pref("_user.js.parrot", "4000 syntax error: the parrot's pegged out"); /* 4001: enable First Party Isolation [FF51+] - * [SETUP-WEB] May break cross-domain logins and site functionality until perfected + * [SETUP-WEB] Breaks some cross-origin logins * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1260931,1299996 ***/ user_pref("privacy.firstparty.isolate", true); /* 4002: enforce FPI restriction for window.opener [FF54+] * [NOTE] Setting this to false may reduce the breakage in 4001 * FF65+ blocks postMessage with targetOrigin "*" if originAttributes don't match. But * to reduce breakage it ignores the 1st-party domain (FPD) originAttribute [2][3] - * The 2nd pref removes that limitation and will only allow communication if FPDs also match. + * The 2nd pref removes that limitation and will only allow communication if FPDs also match * [1] https://bugzilla.mozilla.org/1319773#c22 * [2] https://bugzilla.mozilla.org/1492607 - * [3] https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage ***/ + * [3] https://developer.mozilla.org/docs/Web/API/Window/postMessage ***/ // user_pref("privacy.firstparty.isolate.restrict_opener_access", true); // [DEFAULT: true] // user_pref("privacy.firstparty.isolate.block_post_message", true); /* 4003: enable scheme with FPI [FF78+] * [NOTE] Experimental: existing data and site permissions are incompatible - * and some site exceptions may not work e.g. HTTPS-only mode (see 1244) ***/ + * and some site exceptions may not work e.g. HTTPS-only mode (1244) ***/ // user_pref("privacy.firstparty.isolate.use_site", true); /*** [SECTION 4500]: RFP (RESIST FINGERPRINTING) RFP covers a wide range of ongoing fingerprinting solutions. It is an all-or-nothing buy in: you cannot pick and choose what parts you want - [WARNING] Do NOT use extensions to alter RFP protected metrics - [WARNING] Do NOT use prefs in section 4600 with RFP as they can interfere + [WARNING] DO NOT USE extensions to alter RFP protected metrics - FF41+ - 418986 - limit window.screen & CSS media queries leaking identifiable info + 418986 - limit window.screen & CSS media queries (FF41) [TEST] https://arkenfox.github.io/TZP/tzp.html#screen - FF50+ - 1281949 - spoof screen orientation - 1281963 - hide the contents of navigator.plugins and navigator.mimeTypes (FF50+) - FF55+ - 1330890 - spoof timezone as UTC 0 - 1360039 - spoof navigator.hardwareConcurrency as 2 (see 4601) - 1217238 - reduce precision of time exposed by javascript - FF56+ - 1369303 - spoof/disable performance API (see 4602, 4603) - 1333651 - spoof User Agent & Navigator API (see section 4700) - JS: FF78+ the version is spoofed as ESR, and the OS as Windows 10, OS 10.15, Android 9 (FF91+ as 10), or Linux + 1281949 - spoof screen orientation (FF50) + 1281963 - hide contents of navigator.plugins and navigator.mimeTypes (FF50-88) + 1330890 - spoof timezone as UTC0 (FF55) + 1360039 - spoof navigator.hardwareConcurrency as 2 (FF55) + 1217238 - reduce precision of time exposed by javascript (FF55) + FF56 + 1369303 - spoof/disable performance API + 1333651 - spoof User Agent & Navigator API + JS: FF91+ the version is spoofed as ESR, and the OS as Windows 10, OS 10.15, Android 10, or Linux HTTP Headers: spoofed as Windows or Android - 1369319 - disable device sensor API (see 4604) - 1369357 - disable site specific zoom (see 4605) - 1337161 - hide gamepads from content (see 4606) - 1372072 - spoof network information API as "unknown" when dom.netinfo.enabled = true (see 4607) - 1333641 - reduce fingerprinting in WebSpeech API (see 4608) - FF57+ - 1369309 - spoof media statistics (see 4610) - 1382499 - reduce screen co-ordinate fingerprinting in Touch API (see 4611) - 1217290 & 1409677 - enable fingerprinting resistance for WebGL (see 2010-12) + 1369319 - disable device sensor API + 1369357 - disable site specific zoom + 1337161 - hide gamepads from content + 1372072 - spoof network information API as "unknown" when dom.netinfo.enabled = true + 1333641 - reduce fingerprinting in WebSpeech API + FF57 + 1369309 - spoof media statistics + 1382499 - reduce screen co-ordinate fingerprinting in Touch API + 1217290 & 1409677 - enable some fingerprinting resistance for WebGL 1382545 - reduce fingerprinting in Animation API 1354633 - limit MediaError.message to a whitelist 1382533 & 1697680 - enable fingerprinting resistance for Presentation API (FF57-87) - This blocks exposure of local IP Addresses via mDNS (Multicast DNS) - FF58+ - 967895 - spoof canvas and enable site permission prompt before allowing canvas data extraction - FF59+ - 1372073 - spoof/block fingerprinting in MediaDevices API - Spoof: enumerate devices reports one "Internal Camera" and one "Internal Microphone" if - media.navigator.enabled is true (see 2505 which we chose to keep disabled) - Block: suppresses the ondevicechange event (see 4612) - 1039069 - warn when language prefs are set to non en-US (see 0210, 0211) - 1222285 & 1433592 - spoof keyboard events and suppress keyboard modifier events + Blocks exposure of local IP Addresses via mDNS (Multicast DNS) + FF58-90 + 967895 - spoof canvas and enable site permission prompt (FF58) + 1372073 - spoof/block fingerprinting in MediaDevices API (FF59) + Spoof: enumerate devices as one "Internal Camera" and one "Internal Microphone" + Block: suppresses the ondevicechange event + 1039069 - warn when language prefs are not set to "en*" (also see 0210, 0211) (FF59) + 1222285 & 1433592 - spoof keyboard events and suppress keyboard modifier events (FF59) Spoofing mimics the content language of the document. Currently it only supports en-US. Modifier events suppressed are SHIFT and both ALT keys. Chrome is not affected. - FF60-67 - 1337157 - disable WebGL debug renderer info (see 4613) (FF60+) - 1459089 - disable OS locale in HTTP Accept-Language headers (ANDROID) (FF62+) - 1479239 - return "no-preference" with prefers-reduced-motion (see 4614) (FF63+) - 1363508 - spoof/suppress Pointer Events (see 4615) (FF64+) - FF65: pointerEvent.pointerid (1492766) - 1485266 - disable exposure of system colors to CSS or canvas (see 4616) (FF67+) - 1407366 - enable inner window letterboxing (see 4504) (FF67+) - 1494034 - return "light" with prefers-color-scheme (see 4617) (FF67+) - FF68-77 - 1564422 - spoof audioContext outputLatency (FF70+) - 1595823 - spoof audioContext sampleRate (FF72+) - 1607316 - spoof pointer as coarse and hover as none (ANDROID) (FF74+) - FF78+ - 1621433 - randomize canvas (previously FF58+ returned an all-white canvas) (FF78+) - 1653987 - limit font visibility to bundled and "Base Fonts" (see 4618) (Windows, Mac, some Linux) (FF80+) - 1461454 - spoof smooth=true and powerEfficient=false for supported media in MediaCapabilities (FF82+) + 1337157 - disable WebGL debug renderer info (FF60) + 1459089 - disable OS locale in HTTP Accept-Language headers (ANDROID) (FF62) + 1479239 - return "no-preference" with prefers-reduced-motion (FF63) + 1363508 - spoof/suppress Pointer Events (FF64) + 1492766 - spoof pointerEvent.pointerid (FF65) + 1485266 - disable exposure of system colors to CSS or canvas (FF67) + 1494034 - return "light" with prefers-color-scheme (FF67) + 1564422 - spoof audioContext outputLatency (FF70) + 1595823 - return audioContext sampleRate as 44100 (FF72) + 1607316 - spoof pointer as coarse and hover as none (ANDROID) (FF74) + 1621433 - randomize canvas (previously FF58+ returned an all-white canvas) (FF78) + 1653987 - limit font visibility to bundled and "Base Fonts" (Windows, Mac, some Linux) (FF80) + 1461454 - spoof smooth=true and powerEfficient=false for supported media in MediaCapabilities (FF82) + FF91+ + 531915 - use fdlibm's sin, cos and tan in jsmath (FF93, ESR91.1) ***/ user_pref("_user.js.parrot", "4500 syntax error: the parrot's popped 'is clogs"); /* 4501: enable privacy.resistFingerprinting [FF41+] - * This pref is the master switch for all other privacy.resist* prefs unless stated - * [SETUP-WEB] RFP can cause the odd website to break in strange ways, and has a few side affects, - * but is largely robust nowadays. Give it a try. Your choice. Also see 4504 (letterboxing). + * [SETUP-WEB] RFP can cause some website breakage: mainly canvas, use a site exception via the urlbar + * RFP also has a few side effects: mainly timezone is UTC0, and websites will prefer light theme * [1] https://bugzilla.mozilla.org/418986 ***/ user_pref("privacy.resistFingerprinting", true); /* 4502: set new window sizes to round to hundreds [FF55+] [SETUP-CHROME] * Width will round down to multiples of 200s and height to 100s, to fit your screen. - * The override values are a starting point to round from if you want some control + * The max values are a starting point to round from if you want some control * [1] https://bugzilla.mozilla.org/1330882 ***/ // user_pref("privacy.window.maxInnerWidth", 1000); // user_pref("privacy.window.maxInnerHeight", 1000); @@ -1469,138 +1039,312 @@ user_pref("privacy.resistFingerprinting", true); user_pref("privacy.resistFingerprinting.block_mozAddonManager", true); // [HIDDEN PREF] /* 4504: enable RFP letterboxing [FF67+] * Dynamically resizes the inner window by applying margins in stepped ranges [2] - * If you use the dimension pref, then it will only apply those resolutions. The format is - * "width1xheight1, width2xheight2, ..." (e.g. "800x600, 1000x1000, 1600x900") - * [SETUP-WEB] This does NOT require RFP (see 4501) **for now**, so if you're not using 4501, or you are but - * dislike margins being applied, then flip this pref, keeping in mind that it is effectively fingerprintable - * [WARNING] The dimension pref is only meant for testing, and we recommend you DO NOT USE it + * If you use the dimension pref, then it will only apply those resolutions. + * The format is "width1xheight1, width2xheight2, ..." (e.g. "800x600, 1000x1000") + * [SETUP-WEB] This is independent of RFP (4501). If you're not using RFP, or you are but + * dislike the margins, then flip this pref, keeping in mind that it is effectively fingerprintable + * [WARNING] DO NOT USE: the dimension pref is only meant for testing * [1] https://bugzilla.mozilla.org/1407366 * [2] https://hg.mozilla.org/mozilla-central/rev/6d2d7856e468#l2.32 ***/ user_pref("privacy.resistFingerprinting.letterboxing", true); // [HIDDEN PREF] // user_pref("privacy.resistFingerprinting.letterboxing.dimensions", ""); // [HIDDEN PREF] -/* 4510: disable showing about:blank as soon as possible during startup [FF60+] +/* 4505: experimental RFP [FF91+] + * [WARNING] DO NOT USE unless testing, see [1] comment 12 + * [1] https://bugzilla.mozilla.org/1635603 ***/ + // user_pref("privacy.resistFingerprinting.exemptedDomains", "*.example.invalid"); + // user_pref("privacy.resistFingerprinting.testGranularityMask", 0); +/* 4506: disable showing about:blank as soon as possible during startup [FF60+] * When default true this no longer masks the RFP chrome resizing activity * [1] https://bugzilla.mozilla.org/1448423 ***/ user_pref("browser.startup.blankWindow", false); -/* 4520: disable chrome animations [FF77+] [RESTART] - * [NOTE] pref added in FF63, but applied to chrome in FF77. RFP spoofs this for web content ***/ -user_pref("ui.prefersReducedMotion", 1); // [HIDDEN PREF] +/* 4510: enforce no system colors + * [SETTING] General>Language and Appearance>Fonts and Colors>Colors>Use system colors ***/ +user_pref("browser.display.use_system_colors", false); // [DEFAULT: false] +/* 4511: enforce non-native widget theme + * Security: removes/reduces system API calls, e.g. win32k API [1] + * Fingerprinting: provides a uniform look and feel across platforms [2] + * [1] https://bugzilla.mozilla.org/1381938 + * [2] https://bugzilla.mozilla.org/1411425 ***/ +user_pref("widget.non-native-theme.enabled", true); // [DEFAULT: true FF89+] +/* 4512: open links targeting new windows in a new tab instead + * Stops malicious window sizes and some screen resolution leaks. + * You can still right-click a link and open in a new window + * [TEST] https://arkenfox.github.io/TZP/tzp.html#screen + * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/9881 ***/ +user_pref("browser.link.open_newwindow", 3); // 1=most recent window or tab 2=new window, 3=new tab +user_pref("browser.link.open_newwindow.restriction", 0); +/* 4513: disable WebGL (Web Graphics Library) + * [SETUP-WEB] If you need it then enable it. RFP still randomizes canvas for naive scripts ***/ +user_pref("webgl.disabled", true); -/*** [SECTION 4600]: RFP ALTERNATIVES - [WARNING] Do NOT use prefs in this section with RFP as they can interfere +/*** [SECTION 5000]: OPTIONAL OPSEC + Disk avoidance, application data isolation, eyeballs... ***/ -user_pref("_user.js.parrot", "4600 syntax error: the parrot's crossed the Jordan"); -/* [SETUP-non-RFP] Non-RFP users replace the * with a slash on this line to enable these -// FF55+ -// 4601: [2514] spoof number of CPU cores [FF48+] - // [1] https://bugzilla.mozilla.org/1008453 - // [2] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21675 - // [3] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/22127 - // [4] https://html.spec.whatwg.org/multipage/workers.html#navigator.hardwareconcurrency -user_pref("dom.maxHardwareConcurrency", 2); -// FF56+ -// 4602: [2411] disable resource/navigation timing -user_pref("dom.enable_resource_timing", false); -// 4603: [2412] disable timing attacks - // [1] https://wiki.mozilla.org/Security/Reviews/Firefox/NavigationTimingAPI - // user_pref("dom.enable_performance", false); -// 4604: [2512] disable device sensor API - // Optional protection depending on your device - // [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/15758 - // [2] https://blog.lukaszolejnik.com/stealing-sensitive-browser-data-with-the-w3c-ambient-light-sensor-api/ - // [3] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1357733,1292751 +user_pref("_user.js.parrot", "5000 syntax error: the parrot's taken 'is last bow"); +/* 5001: start Firefox in PB (Private Browsing) mode + * [NOTE] In this mode all windows are "private windows" and the PB mode icon is not displayed + * [NOTE] The P in PB mode can be misleading: it means no "persistent" disk state such as history, + * caches, searches, cookies, localStorage, IndexedDB etc (which you can achieve in normal mode). + * In fact, PB mode limits or removes the ability to control some of these, and you need to quit + * Firefox to clear them. PB is best used as a one off window (Menu>New Private Window) to provide + * a temporary self-contained new session. Close all Private Windows to clear the PB mode session. + * [SETTING] Privacy & Security>History>Custom Settings>Always use private browsing mode + * [1] https://wiki.mozilla.org/Private_Browsing + * [2] https://support.mozilla.org/kb/common-myths-about-private-browsing ***/ + // user_pref("browser.privatebrowsing.autostart", true); +/* 5002: disable memory cache + * capacity: -1=determine dynamically (default), 0=none, n=memory capacity in kibibytes ***/ + // user_pref("browser.cache.memory.enable", false); + // user_pref("browser.cache.memory.capacity", 0); +/* 5003: disable saving passwords + * [NOTE] This does not clear any passwords already saved + * [SETTING] Privacy & Security>Logins and Passwords>Ask to save logins and passwords for websites ***/ + // user_pref("signon.rememberSignons", false); +/* 5004: disable permissions manager from writing to disk [FF41+] [RESTART] + * [NOTE] This means any permission changes are session only + * [1] https://bugzilla.mozilla.org/967812 ***/ + // user_pref("permissions.memory_only", true); // [HIDDEN PREF] +/* 5005: disable intermediate certificate caching [FF41+] [RESTART] + * [NOTE] This affects login/cert/key dbs. The effect is all credentials are session-only. + * Saved logins and passwords are not available. Reset the pref and restart to return them ***/ + // user_pref("security.nocertdb", true); // [HIDDEN PREF] +/* 5006: disable favicons in history and bookmarks + * [NOTE] Stored as data blobs in favicons.sqlite, these don't reveal anything that your + * actual history (and bookmarks) already do. Your history is more detailed, so + * control that instead; e.g. disable history, clear history on close, use PB mode + * [NOTE] favicons.sqlite is sanitized on Firefox close ***/ + // user_pref("browser.chrome.site_icons", false); +/* 5007: exclude "Undo Closed Tabs" in Session Restore ***/ + // user_pref("browser.sessionstore.max_tabs_undo", 0); +/* 5008: disable resuming session from crash ***/ + // user_pref("browser.sessionstore.resume_from_crash", false); +/* 5009: disable "open with" in download dialog [FF50+] + * Application data isolation [1] + * [1] https://bugzilla.mozilla.org/1281959 ***/ + // user_pref("browser.download.forbid_open_with", true); +/* 5010: disable location bar suggestion types + * [SETTING] Privacy & Security>Address Bar>When using the address bar, suggest ***/ + // user_pref("browser.urlbar.suggest.history", false); + // user_pref("browser.urlbar.suggest.bookmark", false); + // user_pref("browser.urlbar.suggest.openpage", false); + // user_pref("browser.urlbar.suggest.topsites", false); // [FF78+] +/* 5011: disable location bar dropdown + * This value controls the total number of entries to appear in the location bar dropdown ***/ + // user_pref("browser.urlbar.maxRichResults", 0); +/* 5012: disable location bar autofill + * [1] https://support.mozilla.org/kb/address-bar-autocomplete-firefox#w_url-autocomplete ***/ + // user_pref("browser.urlbar.autoFill", false); +/* 5013: disable browsing and download history + * [NOTE] We also clear history and downloads on exit (2803) + * [SETTING] Privacy & Security>History>Custom Settings>Remember browsing and download history ***/ + // user_pref("places.history.enabled", false); +/* 5014: disable Windows jumplist [WINDOWS] ***/ + // user_pref("browser.taskbar.lists.enabled", false); + // user_pref("browser.taskbar.lists.frequent.enabled", false); + // user_pref("browser.taskbar.lists.recent.enabled", false); + // user_pref("browser.taskbar.lists.tasks.enabled", false); +/* 5015: disable Windows taskbar preview [WINDOWS] ***/ + // user_pref("browser.taskbar.previews.enable", false); // [DEFAULT: false] +/* 5016: discourage downloading to desktop + * 0=desktop, 1=downloads (default), 2=last used + * [SETTING] To set your default "downloads": General>Downloads>Save files to ***/ + // user_pref("browser.download.folderList", 2); + +/*** [SECTION 5500]: OPTIONAL HARDENING + Not recommended. Keep in mind that these can cause breakage and performance + issues, are mostly fingerpintable, and the threat model is practically zero +***/ +user_pref("_user.js.parrot", "5500 syntax error: this is an ex-parrot!"); +/* 5501: disable MathML (Mathematical Markup Language) [FF51+] + * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=mathml ***/ + // user_pref("mathml.disabled", true); // 1173199 +/* 5502: disable in-content SVG (Scalable Vector Graphics) [FF53+] + * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=firefox+svg ***/ + // user_pref("svg.disabled", true); // 1216893 +/* 5503: disable graphite + * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=firefox+graphite + * [2] https://en.wikipedia.org/wiki/Graphite_(SIL) ***/ + // user_pref("gfx.font_rendering.graphite.enabled", false); +/* 5504: disable asm.js [FF22+] + * [1] http://asmjs.org/ + * [2] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=asm.js + * [3] https://rh0dev.github.io/blog/2017/the-return-of-the-jit/ ***/ + // user_pref("javascript.options.asmjs", false); +/* 5505: disable Ion and baseline JIT to harden against JS exploits + * [NOTE] In FF75+, when **both** Ion and JIT are disabled, **and** the new + * hidden pref is enabled, then Ion can still be used by extensions (1599226) + * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=firefox+jit ***/ + // user_pref("javascript.options.ion", false); + // user_pref("javascript.options.baselinejit", false); + // user_pref("javascript.options.jit_trustedprincipals", true); // [FF75+] [HIDDEN PREF] +/* 5506: disable WebAssembly [FF52+] + * Vulnerabilities [1] have increasingly been found, including those known and fixed + * in native programs years ago [2]. WASM has powerful low-level access, making + * certain attacks (brute-force) and vulnerabilities more possible + * [STATS] ~0.2% of websites, about half of which are for crytopmining / malvertising [2][3] + * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=wasm + * [2] https://spectrum.ieee.org/tech-talk/telecom/security/more-worries-over-the-security-of-web-assembly + * [3] https://www.zdnet.com/article/half-of-the-websites-using-webassembly-use-it-for-malicious-purposes ***/ + // user_pref("javascript.options.wasm", false); + +/*** [SECTION 6000]: DON'T TOUCH ***/ +user_pref("_user.js.parrot", "6000 syntax error: the parrot's 'istory!"); +/* 6001: enforce Firefox blocklist + * [WHY] It includes updates for "revoked certificates" + * [1] https://blog.mozilla.org/security/2015/03/03/revoking-intermediate-certificates-introducing-onecrl/ ***/ +user_pref("extensions.blocklist.enabled", true); // [DEFAULT: true] +/* 6002: enforce no referer spoofing + * [WHY] Spoofing can affect CSRF (Cross-Site Request Forgery) protections ***/ +user_pref("network.http.referer.spoofSource", false); // [DEFAULT: false] +/* 6003: enforce CSP (Content Security Policy) + * [1] https://developer.mozilla.org/docs/Web/HTTP/CSP ***/ +user_pref("security.csp.enable", true); // [DEFAULT: true] +/* 6004: enforce a security delay on some confirmation dialogs such as install, open/save + * [1] https://www.squarefree.com/2004/07/01/race-conditions-in-security-dialogs/ ***/ +user_pref("security.dialog_enable_delay", 1000); // [DEFAULT: 1000] +/* 6005: enforce window.opener protection [FF65+] + * Makes rel=noopener implicit for target=_blank in anchor and area elements when no rel attribute is set ***/ +user_pref("dom.targetBlankNoOpener.enabled", true); // [DEFAULT: true FF79+] +/* 6006: enforce "window.name" protection [FF82+] + * If a new page from another domain is loaded into a tab, then window.name is set to an empty string. The original + * string is restored if the tab reverts back to the original page. This change prevents some cross-site attacks + * [TEST] https://arkenfox.github.io/TZP/tests/windownamea.html ***/ +user_pref("privacy.window.name.update.enabled", true); // [DEFAULT: true FF86+] +/* 6050: prefsCleaner: reset previously active items removed from arkenfox in 79-91 ***/ + // user_pref("browser.newtabpage.activity-stream.asrouter.providers.snippets", ""); + // user_pref("browser.send_pings.require_same_host", ""); + // user_pref("dom.allow_cut_copy", ""); + // user_pref("dom.vibrator.enabled", ""); + // user_pref("media.getusermedia.audiocapture.enabled", ""); + // user_pref("media.getusermedia.browser.enabled", ""); + // user_pref("media.getusermedia.screensharing.enabled", ""); + // user_pref("media.gmp-widevinecdm.visible", ""); + // user_pref("network.http.redirection-limit", ""); + // user_pref("privacy.partition.network_state", ""); + // user_pref("security.insecure_connection_icon.enabled", ""); // [DEFAULT: true FF70+] + // user_pref("security.mixed_content.block_active_content", ""); // [DEFAULT: true since at least FF60] + // user_pref("security.ssl.enable_ocsp_stapling", ""); // [DEFAULT: true FF26+] + // user_pref("webgl.disable-fail-if-major-performance-caveat", ""); // [DEFAULT: true FF86+] + // user_pref("webgl.enable-webgl2", ""); + // user_pref("webgl.min_capability_mode", ""); + +/*** [SECTION 7000]: DON'T BOTHER ***/ +user_pref("_user.js.parrot", "7000 syntax error: the parrot's pushing up daisies!"); +/* 7001: disable APIs + * Location-Aware Browsing, Full Screen, offline cache (appCache), Virtual Reality + * [WHY] The API state is easily fingerprintable. Geo and VR are behind prompts (7002). + * appCache storage capability was removed in FF90. Full screen requires user interaction ***/ + // user_pref("geo.enabled", false); + // user_pref("full-screen-api.enabled", false); + // user_pref("browser.cache.offline.enable", false); + // user_pref("dom.vr.enabled", false); +/* 7002: set default permissions + * Location, Camera, Microphone, Notifications [FF58+] Virtual Reality [FF73+] + * 0=always ask (default), 1=allow, 2=block + * [WHY] These are fingerprintable via Permissions API, except VR. Just add site + * exceptions as allow/block for frequently visited/annoying sites: i.e. not global + * [SETTING] to add site exceptions: Ctrl+I>Permissions> + * [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Settings ***/ + // user_pref("permissions.default.geo", 0); + // user_pref("permissions.default.camera", 0); + // user_pref("permissions.default.microphone", 0); + // user_pref("permissions.default.desktop-notification", 0); + // user_pref("permissions.default.xr", 0); // Virtual Reality +/* 7003: disable non-modern cipher suites [1] + * [WHY] Passive fingerprinting. Minimal/non-existent threat of downgrade attacks + * [1] https://browserleaks.com/ssl ***/ + // user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha", false); + // user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false); + // user_pref("security.ssl3.ecdhe_rsa_aes_128_sha", false); + // user_pref("security.ssl3.ecdhe_rsa_aes_256_sha", false); + // user_pref("security.ssl3.rsa_aes_128_gcm_sha256", false); // no PFS + // user_pref("security.ssl3.rsa_aes_256_gcm_sha384", false); // no PFS + // user_pref("security.ssl3.rsa_aes_128_sha", false); // no PFS + // user_pref("security.ssl3.rsa_aes_256_sha", false); // no PFS + // user_pref("security.ssl3.rsa_des_ede3_sha", false); // 3DES +/* 7004: control TLS versions + * [WHY] Passive fingerprinting. Downgrades are still possible: behind user interaction ***/ + // user_pref("security.tls.version.min", 3); // [DEFAULT: 3] + // user_pref("security.tls.version.max", 4); +/* 7005: disable SSL session IDs [FF36+] + * [WHY] Passive fingerprinting and perf costs. These are session-only and isolated + * with network partitioning (FF85+) or when using FPI and/or containers ***/ + // user_pref("security.ssl.disable_session_identifiers", true); // [HIDDEN PREF] +/* 7006: onions + * [WHY] Firefox doesn't support hidden services. Use Tor Browser ***/ + // user_pref("dom.securecontext.whitelist_onions", true); // 1382359 + // user_pref("network.http.referer.hideOnionSource", true); // 1305144 +/* 7007: referers + * [WHY] Only cross-origin referers (1600s) need control ***/ + // user_pref("network.http.sendRefererHeader", 2); + // user_pref("network.http.referer.trimmingPolicy", 0); +/* 7008: set the default Referrer Policy [FF59+] + * 0=no-referer, 1=same-origin, 2=strict-origin-when-cross-origin, 3=no-referrer-when-downgrade + * [WHY] Defaults are fine. They can be overridden by a site-controlled Referrer Policy ***/ + // user_pref("network.http.referer.defaultPolicy", 2); // [DEFAULT: 2 FF87+] + // user_pref("network.http.referer.defaultPolicy.pbmode", 2); // [DEFAULT: 2] +/* 7009: disable HTTP2 + * [WHY] Passive fingerprinting. ~50% of sites use HTTP2 [1] + * [1] https://w3techs.com/technologies/details/ce-http2/all/all ***/ + // user_pref("network.http.spdy.enabled", false); + // user_pref("network.http.spdy.enabled.deps", false); + // user_pref("network.http.spdy.enabled.http2", false); + // user_pref("network.http.spdy.websockets", false); // [FF65+] +/* 7010: disable HTTP Alternative Services [FF37+] + * [WHY] Already isolated by network partitioning (FF85+) or FPI ***/ + // user_pref("network.http.altsvc.enabled", false); + // user_pref("network.http.altsvc.oe", false); +/* 7011: disable website control over browser right-click context menu + * [WHY] Just use Shift-Right-Click ***/ + // user_pref("dom.event.contextmenu.enabled", false); +/* 7012: disable icon fonts (glyphs) and local fallback rendering + * [WHY] Breakage, font fallback is equivalency, also RFP + * [1] https://bugzilla.mozilla.org/789788 + * [2] https://gitlab.torproject.org/legacy/trac/-/issues/8455 ***/ + // user_pref("gfx.downloadable_fonts.enabled", false); // [FF41+] + // user_pref("gfx.downloadable_fonts.fallback_delay", -1); +/* 7013: disable Clipboard API + * [WHY] Fingerprintable. Breakage. Cut/copy/paste require user + * interaction, and paste is limited to focused editable fields ***/ + // user_pref("dom.event.clipboardevents.enabled", false); + +/*** [SECTION 8000]: DON'T BOTHER: NON-RFP + [WHY] They are insufficient to help anti-fingerprinting and do more harm than good + [WARNING] DO NOT USE with RFP. RFP already covers these and they can interfere +***/ +user_pref("_user.js.parrot", "8000 syntax error: the parrot's crossed the Jordan"); +/* 8001: disable APIs ***/ // user_pref("device.sensors.enabled", false); -// 4605: [2515] disable site specific zoom - // Zoom levels affect screen res and are highly fingerprintable. This does not stop you using - // zoom, it will just not use/remember any site specific settings. Zoom levels on new tabs - // and new windows are reset to default and only the current tab retains the current zoom -user_pref("browser.zoom.siteSpecific", false); -// 4606: [2501] disable gamepad API - USB device ID enumeration - // Optional protection depending on your connected devices - // [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/13023 + // user_pref("dom.enable_performance", false); + // user_pref("dom.enable_resource_timing", false); // user_pref("dom.gamepad.enabled", false); -// 4607: [2503] disable giving away network info [FF31+] - // e.g. bluetooth, cellular, ethernet, wifi, wimax, other, mixed, unknown, none - // [1] https://developer.mozilla.org/docs/Web/API/Network_Information_API - // [2] https://wicg.github.io/netinfo/ - // [3] https://bugzilla.mozilla.org/960426 -user_pref("dom.netinfo.enabled", false); // [DEFAULT: true on Android] -// 4608: [2021] disable the SpeechSynthesis (Text-to-Speech) part of the Web Speech API - // [1] https://developer.mozilla.org/docs/Web/API/Web_Speech_API - // [2] https://developer.mozilla.org/docs/Web/API/SpeechSynthesis - // [3] https://wiki.mozilla.org/HTML5_Speech_API -user_pref("media.webspeech.synth.enabled", false); -// FF57+ -// 4610: [2506] disable video statistics - JS performance fingerprinting [FF25+] - // [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/15757 - // [2] https://bugzilla.mozilla.org/654550 -user_pref("media.video_stats.enabled", false); -// 4611: [2509] disable touch events - // fingerprinting attack vector - leaks screen res & actual screen coordinates - // 0=disabled, 1=enabled, 2=autodetect - // Optional protection depending on your device - // [1] https://developer.mozilla.org/docs/Web/API/Touch_events - // [2] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/10286 + // user_pref("dom.netinfo.enabled", false); + // user_pref("dom.webaudio.enabled", false); +/* 8002: disable other ***/ + // user_pref("browser.display.use_document_fonts", 0); + // user_pref("browser.zoom.siteSpecific", false); // user_pref("dom.w3c_touch_events.enabled", 0); -// FF59+ -// 4612: [2511] disable MediaDevices change detection [FF51+] - // [1] https://developer.mozilla.org/docs/Web/Events/devicechange - // [2] https://developer.mozilla.org/docs/Web/API/MediaDevices/ondevicechange -user_pref("media.ondevicechange.enabled", false); -// FF60+ -// 4613: [2011] disable WebGL debug info being available to websites - // [1] https://bugzilla.mozilla.org/1171228 - // [2] https://developer.mozilla.org/docs/Web/API/WEBGL_debug_renderer_info -user_pref("webgl.enable-debug-renderer-info", false); -// FF63+ -// 4614: enforce prefers-reduced-motion as no-preference [FF63+] [RESTART] - // 0=no-preference, 1=reduce -user_pref("ui.prefersReducedMotion", 0); // [HIDDEN PREF] -// FF64+ -// 4615: [2516] disable PointerEvents [FF86 or lower] - // [1] https://developer.mozilla.org/en-US/docs/Web/API/PointerEvent - // [-] https://bugzilla.mozilla.org/1688105 -user_pref("dom.w3c_pointer_events.enabled", false); -// FF67+ -// 4616: [2618] disable exposure of system colors to CSS or canvas [FF44+] - // [NOTE] See second listed bug: may cause black on black for elements with undefined colors - // [SETUP-CHROME] Might affect CSS in themes and extensions - // [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=232227,1330876 -user_pref("ui.use_standins_for_native_colors", true); -// 4617: enforce prefers-color-scheme as light [FF67+] - // 0=light, 1=dark : This overrides your OS value -user_pref("ui.systemUsesDarkTheme", 0); // [HIDDEN PREF] -// FF80+ -// 4618: limit font visibility (non-ANDROID) [FF79+] - // Uses hardcoded lists with two parts: kBaseFonts + kLangPackFonts [1] - // 1=only base system fonts, 2=also fonts from optional language packs, 3=also user-installed fonts - // [NOTE] Bundled fonts are auto-allowed - // [1] https://searchfox.org/mozilla-central/search?path=StandardFonts*.inc -user_pref("layout.css.font-visibility.level", 1); -// ***/ - -/*** [SECTION 4700]: RFP ALTERNATIVES (USER AGENT SPOOFING) - These prefs are insufficient and leak. Use RFP and **nothing else** - - Many of the user agent components can be derived by other means. When those - values differ, you provide more bits and raise entropy. Examples include - workers, iframes, headers, tcp/ip attributes, feature detection, and many more - - Web extensions also lack APIs to fully protect spoofing -***/ -user_pref("_user.js.parrot", "4700 syntax error: the parrot's taken 'is last bow"); -/* 4701: navigator DOM object overrides - * [WARNING] DO NOT USE ***/ + // user_pref("media.navigator.enabled", false); + // user_pref("media.ondevicechange.enabled", false); + // user_pref("media.video_stats.enabled", false); + // user_pref("media.webspeech.synth.enabled", false); + // user_pref("webgl.enable-debug-renderer-info", false); +/* 8003: spoof ***/ + // user_pref("dom.maxHardwareConcurrency", 2); + // user_pref("font.system.whitelist", ""); // [HIDDEN PREF] // user_pref("general.appname.override", ""); // [HIDDEN PREF] // user_pref("general.appversion.override", ""); // [HIDDEN PREF] // user_pref("general.buildID.override", ""); // [HIDDEN PREF] // user_pref("general.oscpu.override", ""); // [HIDDEN PREF] // user_pref("general.platform.override", ""); // [HIDDEN PREF] // user_pref("general.useragent.override", ""); // [HIDDEN PREF] + // user_pref("ui.use_standins_for_native_colors", true); -/*** [SECTION 5000]: PERSONAL - Non-project related but useful. If any of these interest you, add them to your overrides - To save some overrides, we've made a few active as they seem to be universally used ***/ -user_pref("_user.js.parrot", "5000 syntax error: this is an ex-parrot!"); -/* WELCOME & WHAT's NEW NOTICES ***/ +/*** [SECTION 9000]: PERSONAL + Non-project related but useful. If any interest you, add them to your overrides +***/ +user_pref("_user.js.parrot", "9000 syntax error: the parrot's cashed in 'is chips!"); +/* WELCOME & WHAT'S NEW NOTICES ***/ user_pref("browser.startup.homepage_override.mstone", "ignore"); // master switch // user_pref("startup.homepage_welcome_url", ""); // user_pref("startup.homepage_welcome_url.additional", ""); @@ -1613,7 +1357,11 @@ user_pref("browser.startup.homepage_override.mstone", "ignore"); // master switc // user_pref("full-screen-api.warning.timeout", 0); /* APPEARANCE ***/ // user_pref("browser.download.autohideButton", false); // [FF57+] + // user_pref("ui.systemUsesDarkTheme", 1); // [FF67+] [HIDDEN PREF] + // 0=light, 1=dark: with RFP this only affects chrome // user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true); // [FF68+] allow userChrome/userContent + // user_pref("ui.prefersReducedMotion", 1); // disable chrome animations [FF77+] [RESTART] [HIDDEN PREF] + // 0=no-preference, 1=reduce: with RFP this only affects chrome /* CONTENT BEHAVIOR ***/ // user_pref("accessibility.typeaheadfind", true); // enable "Find As You Type" // user_pref("clipboard.autocopy", false); // disable autocopy default [LINUX] @@ -1627,9 +1375,10 @@ user_pref("browser.startup.homepage_override.mstone", "ignore"); // master switc // user_pref("general.autoScroll", false); // middle-click enabling auto-scrolling [DEFAULT: false on Linux] // user_pref("ui.key.menuAccessKey", 0); // disable alt key toggling the menu bar [RESTART] // user_pref("view_source.tab", false); // view "page/selection source" in a new window [FF68+, FF59 and under] -/* UX FEATURES: disable and hide the icons and menus ***/ +/* UX FEATURES ***/ user_pref("browser.messaging-system.whatsNewPanel.enabled", false); // What's New toolbar icon [FF69+] // user_pref("extensions.pocket.enabled", false); // Pocket Account [FF46+] + // user_pref("extensions.screenshots.disabled", true); // [FF55+] // user_pref("identity.fxaccounts.enabled", false); // Firefox Accounts & Sync [FF60+] [RESTART] // user_pref("reader.parse-on-load.enabled", false); // Reader View /* OTHER ***/ @@ -1642,11 +1391,10 @@ user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", // user_pref("xpinstall.signatures.required", false); // enforced extension signing (Nightly/ESR) /*** [SECTION 9999]: DEPRECATED / REMOVED / LEGACY / RENAMED - Documentation denoted as [-]. Items deprecated in FF78 or earlier have been archived at [1], - which also provides a link-clickable, viewer-friendly version of the deprecated bugzilla tickets - [1] https://github.com/arkenfox/user.js/issues/123 + Documentation denoted as [-]. Items deprecated in FF78 or earlier have been archived at [1] + [1] https://github.com/arkenfox/user.js/issues/123 ***/ -user_pref("_user.js.parrot", "9999 syntax error: the parrot's deprecated!"); +user_pref("_user.js.parrot", "9999 syntax error: the parrot's shuffled off 'is mortal coil!"); /* ESR78.x still uses all the following prefs // [NOTE] replace the * with a slash in the line above to re-enable them // FF79 @@ -1665,7 +1413,7 @@ user_pref("browser.search.geoSpecificDefaults", false); user_pref("browser.search.geoSpecificDefaults.url", ""); // FF86 // 1205: disable SSL Error Reporting - // [1] https://firefox-source-docs.mozilla.org/browser/base/sslerrorreport/preferences.html + // [1] https://firefox-source-docs.mozilla.org/main/65.0/browser/base/sslerrorreport/preferences.html // [-] https://bugzilla.mozilla.org/1681839 user_pref("security.ssl.errorReporting.automatic", false); user_pref("security.ssl.errorReporting.enabled", false); @@ -1677,6 +1425,10 @@ user_pref("browser.download.hide_plugins_without_extensions", false); // 0105d: disable Activity Stream recent Highlights in the Library [FF57+] // [-] https://bugzilla.mozilla.org/1689405 // user_pref("browser.library.activity-stream.enabled", false); +// 8002: disable PointerEvents + // [1] https://developer.mozilla.org/docs/Web/API/PointerEvent + // [-] https://bugzilla.mozilla.org/1688105 + // user_pref("dom.w3c_pointer_events.enabled", false); // FF89 // 0309: disable sending Flash crash reports // [-] https://bugzilla.mozilla.org/1682030 [underlying NPAPI code removed] @@ -1689,11 +1441,18 @@ user_pref("dom.ipc.plugins.reportCrashURL", false); // [-] https://bugzilla.mozilla.org/1682030 [underlying NPAPI code removed] user_pref("security.mixed_content.block_object_subrequest", true); // 1803: disable Flash plugin - // 0=deactivated, 1=ask, 2=enabled - // ESR52.x is the last branch to *fully* support NPAPI, FF52+ stable only supports Flash - // [NOTE] You can still override individual sites via site permissions - // [-] https://bugzilla.mozilla.org/1682030 [underlying NPAPI code removed] + // 0=deactivated, 1=ask, 2=enabled + // ESR52.x is the last branch to fully support NPAPI, FF52+ stable only supports Flash + // [NOTE] You can still override individual sites via site permissions + // [-] https://bugzilla.mozilla.org/1682030 [underlying NPAPI code removed] user_pref("plugin.state.flash", 0); // [DEFAULT: 1] +// FF90 +// 0708: disable FTP [FF60+] + // [-] https://bugzilla.mozilla.org/1574475 + // user_pref("network.ftp.enabled", false); // [DEFAULT: false FF88+] +// 7001: enforce no offline cache storage (appCache) [FF71+] + // [-] https://bugzilla.mozilla.org/1694662 +user_pref("browser.cache.offline.storage.enable", false); // [DEFAULT: false FF84+] // ***/ /* END: internal custom pref to test for syntax errors ***/ |