desktop_user.js/user.js

//
// **********************************************************************************
// user.js | Firefox                                                              *
//                                                                                *
// https://git.nixnet.xyz/Narsil/desktop_user.js                                  * 
// *********************************************************************************/
//
// Author    : Narsil    : https://git.nixnet.xyz/Narsil
//                          
//
//
// Based on  : arkenfox  : https://github.com/arkenfox/user.js
//
//
// License   : https://git.nixnet.xyz/Narsil/desktop_user.js/raw/branch/master/LICENSE
//
// >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
// STARTUP
// >>>>>>>>>>>>>>>>>>>>>
// Disable about:config warning
// FF71-72: chrome://global/content/config.xul
// FF73+: chrome://global/content/config.xhtml ***/
user_pref("general.warnOnAboutConfig", false); // XUL/XHTML version
user_pref("browser.aboutConfig.showWarning", false); // HTML version [FF71+]
//-------------------------------------
// Pref : Disable separate about:welcome page
// https://bugzilla.mozilla.org/show_bug.cgi?id=1617783
user_pref("browser.aboutwelcome.enabled", false);
user_pref("trailhead.firstrun.branches", "");
//-------------------------------------
// Disable default browser check
// [SETTING] General>Startup>Always check if Firefox is your default browser ***/
user_pref("browser.shell.checkDefaultBrowser", false);
// -------------------------------------
// Set START page (0=blank, 1=home, 2=last visited page, 3=resume previous session)
// [NOTE] Session Restore is not used in PB mode and is cleared with history
// [SETTING] General>Startup>Restore previous session ***/
user_pref("browser.startup.page", 0);
// -------------------------------------
// Set HOME+NEWWINDOW page
// about:home=Activity Stream (default), custom URL, about:blank
// [SETTING] Home>New Windows and Tabs>Homepage and new windows ***/
user_pref("browser.startup.homepage", "about:blank");
// -------------------------------------
// Set NEWTAB page
// true=Activity Stream (default), false=blank page
// [SETTING] Home>New Windows and Tabs>New tabs ***/
user_pref("browser.newtabpage.enabled", false);
user_pref("browser.newtab.preload", false);
// -------------------------------------
// Disable Activity Stream telemetry ***/
user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false);
user_pref("browser.newtabpage.activity-stream.telemetry", false);
user_pref("browser.newtabpage.activity-stream.showSearch", false);
user_pref("browser.newtabpage.activity-stream.feeds.topsites", false);
user_pref("browser.newtabpage.activity-stream.feeds.section.highlights", false);
user_pref("browser.newtabpage.activity-stream.feeds.asrouterfeed", false);
// -------------------------------------
// Disable Activity Stream Snippets
// Runs code received from a server (aka Remote Code Execution) and sends information back to a metrics server
// https://abouthome-snippets-service.readthedocs.io/ ***/
user_pref("browser.newtabpage.activity-stream.feeds.snippets", false);
user_pref("browser.newtabpage.activity-stream.asrouter.providers.snippets", "{}");
// -------------------------------------
// 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+]
// -------------------------------------
// Disable Activity Stream recent Highlights in the Library [FF57+] ***/
user_pref("browser.library.activity-stream.enabled", false);
// -------------------------------------
// Clear default topsites
// [NOTE] This does not block you from adding your own ***/
user_pref("browser.newtabpage.activity-stream.default.sites", "");
// -------------------------------------
// Start Firefox in PB (Private Browsing) mode
//  https://wiki.mozilla.org/Private_Browsing
//  https://spreadprivacy.com/is-private-browsing-really-private/ ***/
// user_pref("browser.privatebrowsing.autostart", true);
// >>>>>>>>>>>>>>>>>>>>>
// GEOLOCATION ***/
// >>>>>>>>>>>>>>>>>>>>>
// Disable Location-Aware Browsing
// [NOTE] Best left at default "true", fingerprintable, is already behind a prompt
// https://www.mozilla.org/firefox/geolocation/ ***/
user_pref("geo.enabled", false);
// -------------------------------------
// Set a default permission for Location [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: Page Info>Permissions>Access Your Location
// [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Location>Settings ***/
// user_pref("permissions.default.geo", 2);
// -------------------------------------
// Use Mozilla geolocation service instead of Google when geolocation is enabled [FF74+]
// Optionally enable logging to the console (defaults to false) ***/
user_pref("geo.provider.network.url", "");
// user_pref("geo.provider.network.logging.enabled", true); // [HIDDEN PREF]
// -------------------------------------
// 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]
// -------------------------------------
// Disable region updates
// 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+]
// -------------------------------------
// Set search region
// May not be hidden if Firefox has changed your settings due to your region ***/
user_pref("browser.search.region", "US"); // [HIDDEN PREF]
// >>>>>>>>>>>>>>>>>>>>>
// LANGUAGE / LOCALE ***/
// >>>>>>>>>>>>>>>>>>>>>
// Set preferred language for displaying web pages
// https://addons.mozilla.org/about ***/
user_pref("intl.accept_languages", "en-US, en");
// -------------------------------------
// Enforce US English locale regardless of the system locale
// [SETUP-WEB] May break some input methods e.g xim/ibus for CJK languages
// https://bugzilla.mozilla.org/867501
// https://bugzilla.mozilla.org/1629630 ***/
user_pref("javascript.use_us_english_locale", true); // [HIDDEN PREF]
// >>>>>>>>>>>>>>>>>>>>>
// QUIET FOX
// >>>>>>>>>>>>>>>>>>>>>
// Disable auto-CHECKING for extension and theme updates ***/
user_pref("extensions.update.enabled", false);
// -------------------------------------
// 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
// [SETTING] General>Firefox Updates>Check for updates but let you choose to install them ***/
user_pref("app.update.auto", false);
// -------------------------------------
// Disable auto-INSTALLING extension and theme updates
// [SETTING] about:addons>Extensions>[cog-wheel-icon]>Update Add-ons Automatically (toggle) ***/
user_pref("extensions.update.autoUpdateDefault", false);
// -------------------------------------
// 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);
// ------------------------------------
// Disable connections to Mozilla servers
user_pref("services.settings.server", "");
// -------------------------------------
// Disable search engine updates (e.g. OpenSearch)
// This does not affect Mozilla's built-in or Web Extension search engines ***/
user_pref("browser.search.update", false);
// -------------------------------------
// Disable sending Flash crash reports ***/
user_pref("dom.ipc.plugins.flash.subprocess.crashreporter.enabled", false);
// -------------------------------------
// Disable sending the URL of the website where a plugin crashed ***/
user_pref("dom.ipc.plugins.reportCrashURL", false);
// -------------------------------------
// Disable about:addons' Recommendations pane (uses Google Analytics) ***/
user_pref("extensions.getAddons.showPane", false); // [HIDDEN PREF]
// Disable recommendations in about:addons' Extensions and Themes panes [FF68+] ***/
user_pref("extensions.htmlaboutaddons.recommendations.enabled", false);
// -------------------------------------
// Disable telemetry
// https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html
// https://medium.com/georg-fritzsche/data-preference-changes-in-firefox-58-2d5df9c428b5 ***/
user_pref("toolkit.telemetry.unified", false);
user_pref("toolkit.telemetry.enabled", false);
user_pref("toolkit.telemetry.server", "data:,");
user_pref("toolkit.telemetry.archive.enabled", false);
user_pref("toolkit.telemetry.newProfilePing.enabled", false); // [FF55+]
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+]
// -------------------------------------
// Pref : Disable collect Telemetry on tracking resources traffic.
// An experiment that analyses HTTP traffic and will run at most until Firefox 73, looking for the prevalence of tracking resources going through HTTP.
// https://bugzilla.mozilla.org/show_bug.cgi?id=1533363
pref("network.traffic_analyzer.enabled", false);
// -------------------------------------
// Disable Telemetry Coverage
// 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", "");
// -------------------------------------
// Disable Health Reports
// [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send technical... data ***/
user_pref("datareporting.healthreport.uploadEnabled", false);
// -------------------------------------
// Disable new data submission, master kill switch [FF41+]
// If disabled, no policy is shown or upload takes place, ever
// https://bugzilla.mozilla.org/1195552 ***/
user_pref("datareporting.policy.dataSubmissionEnabled", false);
// -------------------------------------
// Disable Studies (see 0503)
// [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to install and run studies ***/
user_pref("app.shield.optoutstudies.enabled", false);
// -------------------------------------
// Disable personalized Extension Recommendations in about:addons and AMO [FF65+]
// This pref has no effect when Health Reports are disabled
// Privacy & Security>Firefox Data Collection & Use>Allow Firefox to make personalized extension recommendations
// https://support.mozilla.org/kb/personalized-extension-recommendations ***/
user_pref("browser.discovery.enabled", false);
// -------------------------------------
// Disable Crash Reports ***/
user_pref("breakpad.reportURL", "");
user_pref("browser.tabs.crashReporting.sendReport", false); // [FF44+]
user_pref("browser.crashReports.unsubmittedCheck.enabled", false); // [FF51+]
// -------------------------------------
// Disable backlogged Crash Reports
// [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send backlogged crash reports  ***/
user_pref("browser.crashReports.unsubmittedCheck.autoSubmit2", false); // [FF58+]
// -------------------------------------
// Disable Captive Portal detection
// https://www.eff.org/deeplinks/2017/08/how-captive-portals-interfere-wireless-security-and-privacy
// https://wiki.mozilla.org/Necko/CaptivePortal ***/
user_pref("captivedetect.canonicalURL", "");
user_pref("network.captive-portal-service.enabled", false); // [FF52+]
// -------------------------------------
// Disable Network Connectivity checks [FF65+]
// https://bugzilla.mozilla.org/1460537 ***/
user_pref("network.connectivity-service.enabled", false);
// -------------------------------------
// Pref : Disable contentblocking reports
user_pref("browser.contentblocking.reportBreakage.url", "");
user_pref("browser.contentblocking.report.cookie.url", "");
user_pref("browser.contentblocking.report.cryptominer.url", "");
user_pref("browser.contentblocking.report.fingerprinter.url", "");
user_pref("browser.contentblocking.report.lockwise.enabled", false);
user_pref("browser.contentblocking.report.lockwise.how_it_works.url", "");
user_pref("browser.contentblocking.report.manage_devices.url", "");
user_pref("browser.contentblocking.report.monitor.enabled", false);
user_pref("browser.contentblocking.report.monitor.how_it_works.url", "");
user_pref("browser.contentblocking.report.monitor.sign_in_url", "");
user_pref("browser.contentblocking.report.monitor.url", "");
user_pref("browser.contentblocking.report.proxy.enabled", false);
user_pref("browser.contentblocking.report.proxy_extension.url", "");
user_pref("browser.contentblocking.report.social.url", "");
user_pref("browser.contentblocking.report.tracker.url", "");
user_pref("browser.contentblocking.report.endpoint_url", "");
user_pref("browser.contentblocking.report.monitor.home_page_url", "");
user_pref("browser.contentblocking.report.monitor.preferences_url", "");
// -------------------------------------
// Pref : Disable lockwise app callout to the ETP card
// https://bugzilla.mozilla.org/show_bug.cgi?id=1612091
// https://bugzilla.mozilla.org/show_bug.cgi?id=1612088
user_pref("browser.contentblocking.report.show_mobile_app", false);
user_pref("browser.contentblocking.report.lockwise.mobile-android.url", "");
user_pref("browser.contentblocking.report.lockwise.mobile-ios.url", "");
user_pref("browser.contentblocking.report.mobile-android.url", "");
user_pref("browser.contentblocking.report.mobile-ios.url", "");
// -------------------------------------
// Pref : Disable send content blocking log to about:protections
// https://bugzilla.mozilla.org/show_bug.cgi?id=1549832
user_pref("browser.contentblocking.database.enabled", false);
// -------------------------------------
// Pref : Disable celebrating milestone toast when certain numbers of trackers are blocked
user_pref("browser.contentblocking.cfr-milestone.enabled", false);
// Pref : Disable check default browser on first run
user_pref("browser.shell.didSkipDefaultBrowserCheckOnFirstRun", true);
// -------------------------------------
// Pref : Disable WebVTT logging and test events
// https://developer.mozilla.org/en-US/docs/Web/API/WebVTT_API
// https://git.sny.no/gecko/commit/?id=5701a142f2a5e89b1b716e0edec0f18d5e513678
user_pref("media.webvtt.debug.logging", false);
user_pref("media.webvtt.testing.events", false);
// -------------------------------------
// Pref : Disable Corroborate.jsm telemetry
// https://bugzilla.mozilla.org/show_bug.cgi?id=1608308
user_pref("corroborator.enabled", false);
// -------------------------------------
// Pref : Disable Remote Settings
// https://github.com/mozilla-services/remote-settings-lambdas
// https://remote-settings.readthedocs.io/en/latest/
user_pref("security.remote_settings.intermediates.enabled", false);
user_pref("security.remote_settings.intermediates.bucket", "");
user_pref("security.remote_settings.intermediates.collection", "");
user_pref("security.remote_settings.intermediates.signer", "");
user_pref("security.remote_settings.crlite_filters.enabled", false);
user_pref("security.remote_settings.crlite_filters.bucket", "");
user_pref("security.remote_settings.crlite_filters.collection", "");
user_pref("security.remote_settings.crlite_filters.signer", "");
// -------------------------------------
// Pref : Block unwanted connections
user_pref("app.feedback.baseURL", "");
user_pref("app.support.baseURL", "");
// -------------------------------------
// Pref : Disable report browser errors to Mozilla
// https://bugzilla.mozilla.org/show_bug.cgi?id=1426482
user_pref("browser.chrome.errorReporter.infoURL", "");
// >>>>>>>>>>>>>>>>>>>>>
// SAFE BROWSING (SB)
// >>>>>>>>>>>>>>>>>>>>>
// 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);
// -------------------------------------
// Disable SB checks for downloads (both local lookups + remote)
// This is the master switch for the safebrowsing.downloads
// [SETTING] Privacy & Security>Security>... "Block dangerous downloads" ***/
user_pref("browser.safebrowsing.downloads.enabled", false);
// -------------------------------------
// Disable SB checks for downloads (remote)
// [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", "");
// -------------------------------------
// 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);
// -------------------------------------
// Disable 'ignore this warning' on SB warnings
// If clicked, it bypasses the block for that session. This is a means for admins to enforce SB
// https://bugzilla.mozilla.org/1226490 ***/
user_pref("browser.safebrowsing.allowOverride", false);
// -------------------------------------
// Google connections
user_pref("browser.safebrowsing.downloads.remote.block_dangerous", false); 
user_pref("browser.safebrowsing.downloads.remote.block_dangerous_host", false); 
user_pref("browser.safebrowsing.provider.google.updateURL", "");
user_pref("browser.safebrowsing.provider.google.gethashURL", "");
user_pref("browser.safebrowsing.provider.google4.updateURL", ""); 
user_pref("browser.safebrowsing.provider.google4.gethashURL", "");
user_pref("browser.safebrowsing.provider.google.reportURL", "");
user_pref("browser.safebrowsing.reportPhishURL", "");
user_pref("browser.safebrowsing.provider.google4.reportURL", ""); 
user_pref("browser.safebrowsing.provider.google.reportMalwareMistakeURL", ""); 
user_pref("browser.safebrowsing.provider.google.reportPhishMistakeURL", ""); 
user_pref("browser.safebrowsing.provider.google4.reportMalwareMistakeURL", ""); 
user_pref("browser.safebrowsing.provider.google4.reportPhishMistakeURL", ""); 
user_pref("browser.safebrowsing.provider.google4.dataSharing.enabled", false);
user_pref("browser.safebrowsing.provider.google4.dataSharingURL", "");
user_pref("browser.safebrowsing.provider.google.advisory", "");
user_pref("browser.safebrowsing.provider.google.gethashURL", "");
user_pref("browser.safebrowsing.provider.google4.advisoryURL", "");
user_pref("browser.safebrowsing.blockedURIs.enabled", false);
user_pref("browser.safebrowsing.provider.mozilla.gethashURL", "");
user_pref("browser.safebrowsing.provider.mozilla.updateURL", "");
// >>>>>>>>>>>>>>>>>>>>>
// SYSTEM ADD-ONS / EXPERIMENTS
// >>>>>>>>>>>>>>>>>>>>>
// Disable Normandy/Shield [FF60+]
// Shield is an telemetry system (including Heartbeat) that can also push and test "recipes"
// https://wiki.mozilla.org/Firefox/Shield
// https://github.com/mozilla/normandy ***/
user_pref("app.normandy.enabled", false);
user_pref("app.normandy.api_url", "");
user_pref("app.normandy.shieldLearnMoreUrl", "");
// -------------------------------------
// Disable System Add-on updates ***/
user_pref("extensions.systemAddon.update.enabled", false); // [FF62+]
user_pref("extensions.systemAddon.update.url", ""); // [FF44+]
// -------------------------------------
// Disable PingCentre telemetry (used in several System Add-ons) [FF57+]
// Currently blocked by 'datareporting.healthreport.uploadEnabled' ***/
user_pref("browser.ping-centre.telemetry", false);
// -------------------------------------
// Disable Screenshots
// alternatively in FF60+, disable uploading to the Screenshots server ***/
user_pref("extensions.screenshots.disabled", true); // [FF55+]
user_pref("extensions.screenshots.upload-disabled", true); // [FF60+]
// -------------------------------------
// 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
// 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.enabled", false); // [FF56+]
user_pref("extensions.formautofill.heuristics.enabled", false); // [FF55+]
// -------------------------------------
// Disable 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);
// >>>>>>>>>>>>>>>>>>>>>
// BLOCK IMPLICIT OUTBOUND [not explicitly asked for - e.g. clicked on] ***/
// >>>>>>>>>>>>>>>>>>>>>
// Disable link prefetching
// https://developer.mozilla.org/docs/Web/HTTP/Link_prefetching_FAQ ***/
user_pref("network.prefetch-next", false);
// -------------------------------------
// Disable DNS prefetching
// https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control ***/
user_pref("network.dns.disablePrefetch", true);
user_pref("network.dns.disablePrefetchFromHTTPS", true); // [DEFAULT: true]
// -------------------------------------
// Disable predictor / prefetching ***/
user_pref("network.predictor.enabled", false);
user_pref("network.predictor.enable-prefetch", false); // [FF48+]
// -------------------------------------
// Disable link-mouseover opening connection to linked server
// https://news.slashdot.org/story/15/08/14/2321202/how-to-quash-firefoxs-silent-requests ***/
user_pref("network.http.speculative-parallel-limit", 0);
// -------------------------------------
// Enforce no "Hyperlink Auditing" (click tracking)
// https://www.bleepingcomputer.com/news/software/major-browsers-to-prevent-disabling-of-click-tracking-privacy-risk/ ***/
user_pref("browser.send_pings", false); // [DEFAULT: false]
user_pref("browser.send_pings.require_same_host", true); // defense-in-depth
// >>>>>>>>>>>>>>>>>>>>>
// HTTP* / TCP/IP / DNS / PROXY / SOCKS etc ***/
// >>>>>>>>>>>>>>>>>>>>>
// Disable IPv6
// IPv6 can be abused, especially with MAC addresses, and they do not play nice 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 (June 2020) shows only 5% of all connections are IPv6
// [NOTE] This is just 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/
// https://github.com/arkenfox/user.js/issues/437#issuecomment-403740626
// https://www.internetsociety.org/tag/ipv6-security/ ***/
user_pref("network.dns.disableIPv6", true);
// -------------------------------------
// 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] Disabling this made sense in the past, and doesn't break anything, but HTTP2 is
// at 40% (December 2019) and growing. Don't be that one person using HTTP1.1 on HTTP2 sites
// https://http2.github.io/faq/
// https://blog.scottlogic.com/2014/11/07/http-2-a-quick-look.html
// https://http2.github.io/http2-spec/#rfc.section.10.8
// https://queue.acm.org/detail.cfm?id=2716278
// 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+]
// -------------------------------------
// Disable HTTP Alternative Services [FF37+]
// [SETUP-PERF] Relax this if you have FPI enabled *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.
// https://tools.ietf.org/html/rfc7838#section-9
// https://www.mnot.net/blog/2016/03/09/alt-svc ***/
user_pref("network.http.altsvc.enabled", false);
user_pref("network.http.altsvc.oe", false);
// -------------------------------------
// Enforce 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
// https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers ***/
user_pref("network.proxy.socks_remote_dns", true);
// -------------------------------------
// Disable SSL False Start for HTTPS/WebSockets/SPDY connections
// https://bugzilla.mozilla.org/show_bug.cgi?id=658222
// Avoid the client to complete its handshake before starting the actual session
user_pref("security.ssl.enable_false_start", false);
// -------------------------------------
// Disable FTP [FF60+]
// user_pref("network.ftp.enabled", false);
// -------------------------------------
// Disable using UNC (Uniform Naming Convention) paths [FF61+]
// [SETUP-CHROME] Can break extensions for profiles on network shares
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/26424 ***/
user_pref("network.file.disable_unc_paths", true); // [HIDDEN PREF]
// -------------------------------------
// 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)
// https://bugzilla.mozilla.org/1433507
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/23044
// https://en.wikipedia.org/wiki/GVfs
// https://en.wikipedia.org/wiki/GIO_(software) ***/
user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF]
// -------------------------------------
// Disable DNS-over-HTTPS (DoH)
// See for details: https://support.mozilla.org/en-US/kb/firefox-dns-over-https
user_pref("network.trr.mode", 0);
user_pref("network.trr.uri", "");
// >>>>>>>>>>>>>>>>>>>>>
// LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS
// Change items 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).
// [NOTE] The urlbar is also commonly referred to as the location bar and address bar
// #Required reading [#] https://xkcd.com/538/
// >>>>>>>>>>>>>>>>>>>>>
// Disable location bar using search
// 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)
// [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);
// -------------------------------------
// Disable location bar domain guessing
// domain guessing intercepts DNS "hostname not found errors" and resends a
// request (e.g. by adding www or .com). This is inconsistent use (e.g. FQDNs), does not work
// via Proxy Servers (different error), is a flawed use of DNS (TLDs: why treat .com
// as the 411 for DNS errors?), privacy issues (why connect to sites you didn't
// intend to), can leak sensitive data (e.g. query strings: e.g. Princeton attack),
// and is a security risk (e.g. common typos & malicious sites set up to exploit this) ***/
user_pref("browser.fixup.alternate.enabled", false);
// -------------------------------------
// Display all parts of the url in the location bar ***/
user_pref("browser.urlbar.trimURLs", false);
// -------------------------------------
// Disable coloring of visited links - CSS history leak
// [NOTE] This has NEVER been fully "resolved": in Mozilla/docs it is stated it's
// only in 'certain circumstances'
// [TEST] https://earthlng.github.io/testpages/visited_links.html (see github wiki APPENDIX A on how to use)
// https://dbaron.org/mozilla/visited-privacy
// https://bugzilla.mozilla.org/147777
// https://developer.mozilla.org/docs/Web/CSS/Privacy_and_the_:visited_selector ***/
user_pref("layout.css.visited_links_enabled", false);
// -------------------------------------
// 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);
// -------------------------------------
// Disable location bar making speculative connections [FF56+]
// https://bugzilla.mozilla.org/1348275 ***/
user_pref("browser.urlbar.speculativeConnect.enabled", false);
// -------------------------------------
// 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
// https://bugzilla.mozilla.org/1642623 ***/
user_pref("browser.urlbar.dnsResolveSingleWordsAfterSearch", 0);
// -------------------------------------
// 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+]
// -------------------------------------
// Disable location bar dropdown
// This value controls the total number of entries to appear in the location bar dropdown
// [NOTE] Items (bookmarks/history/openpages) with a high "frecency"/"bonus" will always
// be displayed (no we do not know how these are calculated or what the threshold is),
// and this does not affect the search by search engine suggestion
// [NOTE] This setting is only useful if you want to enable search engine keywords
// (i.e. at least one of 0850a suggestion types must be true) but you want to *limit* suggestions shown ***/
// user_pref("browser.urlbar.maxRichResults", 0);
// -------------------------------------
// Disable location bar autofill
// https://support.mozilla.org/en-US/kb/address-bar-autocomplete-firefox#w_url-autocomplete ***/
user_pref("browser.urlbar.autoFill", false);
// -------------------------------------
// Disable search and form history
// [SETUP-WEB] Be aware that autocomplete form data can be read by third parties
// [NOTE] We also clear formdata on exit
// [SETTING] Privacy & Security>History>Custom Settings>Remember search and form history
// https://blog.mindedsecurity.com/2011/10/autocompleteagain.html
// https://bugzilla.mozilla.org/381681 ***/
user_pref("browser.formfill.enable", false);
// -------------------------------------
// Disable browsing and download history
// [NOTE] We also clear history and downloads on exiting Firefox
// [SETTING] Privacy & Security>History>Custom Settings>Remember browsing and download history ***/
user_pref("places.history.enabled", false);
// -------------------------------------
// 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);
// -------------------------------------
// Disable Windows taskbar preview [WINDOWS] ***/
user_pref("browser.taskbar.previews.enable", false);
// >>>>>>>>>>>>>>>>>>>>>
// PASSWORDS ***/
// >>>>>>>>>>>>>>>>>>>>>
// Disable saving passwords and password alerts.
// [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);
user_pref("signon.generation.enabled", false);
user_pref("signon.management.page.breach-alerts.enabled", false);
user_pref("signon.management.page.breachAlertUrl", "");
// -------------------------------------
// 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
// https://support.mozilla.org/kb/use-primary-password-protect-stored-logins-and-pas ***/
// 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 ***/
user_pref("security.ask_for_password", 2);
// -------------------------------------
// Set how often in minutes Firefox should ask for the primary password
// in minutes, default is 30 ***/
user_pref("security.password_lifetime", 5);
// -------------------------------------
// 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
// https://freedom-to-tinker.com/2017/12/27/no-boundaries-for-user-identities-web-trackers-exploit-browser-login-managers/ ***/
user_pref("signon.autofillForms", false);
// -------------------------------------
// Disable formless login capture for Password Manager [FF51+] ***/
user_pref("signon.formlessCapture.enabled", false);
// -------------------------------------
// 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)
user_pref("network.auth.subresource-http-auth-allow", 1);
// >>>>>>>>>>>>>>>>>>>>>
// CACHE ***/
// >>>>>>>>>>>>>>>>>>>>>
// 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 ***/
user_pref("browser.cache.disk.enable", false);
// -------------------------------------
// 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);
// -------------------------------------
// Disable permissions manager from writing to disk [RESTART]
// [NOTE] This means any permission changes are session only
// https://bugzilla.mozilla.org/967812 ***/
// user_pref("permissions.memory_only", true); // [HIDDEN PREF]
// -------------------------------------
// 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 ***/
user_pref("browser.privatebrowsing.forceMediaMemoryCache", true); // [FF75+]
user_pref("media.memory_cache_max_size", 65536);
// >>>>>>>>>>>>>>>>>>>>>
// SESSIONS & SESSION RESTORE ***/
// >>>>>>>>>>>>>>>>>>>>>
// Exclude "Undo Closed Tabs" in Session Restore ***/
// user_pref("browser.sessionstore.max_tabs_undo", 0);
// -------------------------------------
// 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:
// 0=everywhere, 1=unencrypted sites, 2=nowhere ***/
user_pref("browser.sessionstore.privacy_level", 2);
// -------------------------------------
// Disable resuming session from crash ***/
// user_pref("browser.sessionstore.resume_from_crash", false);
// -------------------------------------
// Set the minimum interval between session save operations
// Increasing this can help on older machines and some websites, as well as reducing writes
// 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
// https://bugzilla.mozilla.org/1304389 ***/
user_pref("browser.sessionstore.interval", 30000);
// -------------------------------------
// Disable automatic Firefox start and session restore after reboot [FF62+] [WINDOWS]
// https://bugzilla.mozilla.org/603903 ***/
user_pref("toolkit.winRegisterApplicationRestart", false);
// >>>>>>>>>>>>>>>>>>>>>
// FAVICONS ***/
// >>>>>>>>>>>>>>>>>>>>>
// 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.
// If set to false then the shortcuts use a generic Firefox icon ***/
user_pref("browser.shell.shortcutFavicons", false);
// -------------------------------------
// 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);
// -------------------------------------
// Disable favicons in web notifications ***/
user_pref("alerts.showFavicons", false); // [DEFAULT: false]
// >>>>>>>>>>>>>>>>>>>>>
// SSL (Secure Sockets Layer) / TLS (Transport Layer Security) ***/
// >>>>>>>>>>>>>>>>>>>>>
// Require safe negotiation
// Blocks connections to servers that don't support RFC 5746 [2] as they're potentially
// vulnerable to a MiTM attack. A server *without* RFC 5746 can be 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.
// https://wiki.mozilla.org/Security:Renegotiation
// https://tools.ietf.org/html/rfc5746
// https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555 ***/
user_pref("security.ssl.require_safe_negotiation", true);
// -------------------------------------
// Control TLS versions with min and max
// 1=TLS 1.0, 2=TLS 1.1, 3=TLS 1.2, 4=TLS 1.3
// [STATS] Firefox telemetry (June 2020) shows only 0.16% of SSL handshakes use 1.0 or 1.1
// [WARNING] Leave these at default, otherwise you alter your TLS fingerprint.
// https://www.ssllabs.com/ssl-pulse/ ***/
// user_pref("security.tls.version.min", 3); // [DEFAULT: 3]
// user_pref("security.tls.version.max", 4);
// -------------------------------------
// Enforce TLS 1.0 and 1.1 downgrades as session only */
user_pref("security.tls.version.enable-deprecated", false);
// -------------------------------------
// Disable SSL session tracking [FF36+]
// SSL Session IDs are unique, last up to 24hrs in Firefox, and can be used for tracking
// [SETUP-PERF] Relax this if you have FPI enabled *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.
// https://tools.ietf.org/html/rfc5077
// https://bugzilla.mozilla.org/967977
// https://arxiv.org/abs/1810.07304 ***/
user_pref("security.ssl.disable_session_identifiers", true); // [HIDDEN PREF]
// -------------------------------------
// Disable SSL Error Reporting
// https://firefox-source-docs.mozilla.org/browser/base/sslerrorreport/preferences.html ***/
user_pref("security.ssl.errorReporting.automatic", false);
user_pref("security.ssl.errorReporting.enabled", false);
user_pref("security.ssl.errorReporting.url", "");
// -------------------------------------
// Disable TLS1.3 0-RTT (round-trip time) [FF51+]
// https://github.com/tlswg/tls13-spec/issues/1001
// 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)
// >>>>>>>>>>>>>>>>>>>>>
// Enable OCSP Stapling
// https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/ ***/
user_pref("security.ssl.enable_ocsp_stapling", false);
// -------------------------------------
// Control when to use OCSP fetching (to confirm current validity of certificates)
// 0=disabled, 1=enabled (default), 2=enabled for EV certificates only
// OCSP (non-stapled) leaks information about the sites you visit to the CA (cert authority)
// It's a trade-off between security (checking) and privacy (leaking info to the CA)
// [NOTE] This pref only controls OCSP fetching and does not affect OCSP stapling
// https://en.wikipedia.org/wiki/Ocsp ***/
user_pref("security.OCSP.enabled", 0);
// -------------------------------------
// Set OCSP fetch failures (non-stapled) to hard-fail [SETUP-WEB]
// When a CA cannot be reached to validate a cert, Firefox just continues the connection (=soft-fail)
// Setting this pref to true tells Firefox to instead terminate the connection (=hard-fail)
// It is pointless to soft-fail when an OCSP fetch fails: you cannot confirm a cert is still valid (it
// could have been revoked) and/or you could be under attack (e.g. malicious blocking of OCSP servers)
// https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
// https://www.imperialviolet.org/2014/04/19/revchecking.html ***/
user_pref("security.OCSP.require", false);
// >>>>>>>>>>>>>>>>>>>>>
// CERTS / HPKP (HTTP Public Key Pinning) ***/
// >>>>>>>>>>>>>>>>>>>>>
// 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.
// [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);
// -------------------------------------
// Disable Windows 8.1's Microsoft Family Safety cert [FF50+] [WINDOWS]
// 0=disable detecting Family Safety mode and importing the root
// 1=only attempt to detect Family Safety mode (don't import the root)
// 2=detect Family Safety mode and import the root
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21686 ***/
user_pref("security.family_safety.mode", 0);
// -------------------------------------
// 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.
// https://shiftordie.de/blog/2017/02/21/fingerprinting-firefox-users-with-cached-intermediate-ca-certificates-fiprinca/ ***/
// user_pref("security.nocertdb", true); // [HIDDEN PREF]
// -------------------------------------
// Enforce 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
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16206 ***/
user_pref("security.cert_pinning.enforcement_level", 2);
// >>>>>>>>>>>>>>>>>>>>>
// MIXED CONTENT ***/
// >>>>>>>>>>>>>>>>>>>>>
// Enforce no insecure active content on https pages
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21323 ***/
user_pref("security.mixed_content.block_active_content", true); // [DEFAULT: true]
// -------------------------------------
// Disable insecure passive content (such as images) on https pages [SETUP-WEB] ***/
user_pref("security.mixed_content.block_display_content", true);
// -------------------------------------
// Lock unencrypted requests from Flash on encrypted pages to mitigate MitM attacks [FF59+]
// https://bugzilla.mozilla.org/1190623 ***/
user_pref("security.mixed_content.block_object_subrequest", true);
// -------------------------------------
// Enable HTTPS-Only mode [FF76+]
// When "https_only_mode" (all windows) is true, "https_only_mode_pbm" (private windows only) is ignored
// [WARNING] This is experimental [1] and you can't set exceptions if FPI is enabled (fixed in FF83)
// [SETTING] to add site exceptions: Page Info>Permissions>Use insecure HTTP (FF80+)
// [SETTING] Privacy & Security>HTTPS-Only Mode (FF80+ with browser.preferences.exposeHTTPSOnly = true)
// https://bugzilla.mozilla.org/1613063 [META]
// https://bugzilla.mozilla.org/1647829 ***/
user_pref("dom.security.https_only_mode", true); // [FF76+]
user_pref("dom.security.https_only_mode_pbm", true); // [FF80+]
user_pref("dom.security.https_only_mode.upgrade_local", true); // [FF77+]
// >>>>>>>>>>>>>>>>>>>>>
// CIPHERS [WARNING: do not meddle with your cipher suite]
// >>>>>>>>>>>>>>>>>>>>>
// Disable 3DES (effective key size < 128 and no PFS)
// https://en.wikipedia.org/wiki/3des#Security
// https://en.wikipedia.org/wiki/Meet-in-the-middle_attack
// https://www-archive.mozilla.org/projects/security/pki/nss/ssl/fips-ssl-ciphersuites.html ***/
// user_pref("security.ssl3.rsa_des_ede3_sha", false);
// -------------------------------------
// 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) ***/
// >>>>>>>>>>>>>>>>>>>>>
// Display warning on the padlock for "broken security"
// Bug: warning padlock not indicated for subresources on a secure page!
// [STATS] SSL Labs (June 2020) reports 98.8% of sites have secure renegotiation
// https://wiki.mozilla.org/Security:Renegotiation
// https://bugzilla.mozilla.org/1353705
// https://www.ssllabs.com/ssl-pulse/ ***/
user_pref("security.ssl.treat_unsafe_negotiation_as_broken", true);
// -------------------------------------
// Control "Add Security Exception" dialog on SSL warnings
// 0=do neither 1=pre-populate url 2=pre-populate url + pre-fetch cert (default)
// [1] https://github.com/pyllyukko/user.js/issues/210 ***/
user_pref("browser.ssl_override_behavior", 1);
// -------------------------------------
// Display advanced information on Insecure Connection warning pages
// only works when it's possible to add an exception
// 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);
// -------------------------------------
// Display "insecure" icon and "Not Secure" text on HTTP sites ***/
// user_pref("security.insecure_connection_icon.enabled", true); // [FF59+] [DEFAULT: true]
user_pref("security.insecure_connection_text.enabled", true); // [FF60+]
// >>>>>>>>>>>>>>>>>>>>>
// FONTS ***/
// >>>>>>>>>>>>>>>>>>>>>
// 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
// [SETTING] General>Language and Appearance>Fonts & Colors>Advanced>Allow pages to choose... ***/
user_pref("browser.display.use_document_fonts", 0);
// -------------------------------------
// Disable icon fonts (glyphs) and local fallback rendering
// https://bugzilla.mozilla.org/789788
// https://gitlab.torproject.org/legacy/trac/-/issues/8455 ***/
// user_pref("gfx.downloadable_fonts.enabled", false); // [FF41+]
// user_pref("gfx.downloadable_fonts.fallback_delay", -1);
// -------------------------------------
// Disable rendering of SVG OpenType fonts
// https://wiki.mozilla.org/SVGOpenTypeFonts - iSECPartnersReport recommends to disable this ***/
user_pref("gfx.font_rendering.opentype_svg.enabled", false);
// -------------------------------------
// Disable graphite
// Graphite has had many critical security issues in the past
// https://www.mozilla.org/security/advisories/mfsa2017-15/#CVE-2017-7778
// https://en.wikipedia.org/wiki/Graphite_(SIL) ***/
user_pref("gfx.font_rendering.graphite.enabled", false);
// -------------------------------------
// Limit system font exposure to a whitelist [FF52+] [RESTART]
// If the whitelist is empty, then whitelisting is considered disabled and all fonts are allowed
// [WARNING] **DO NOT USE**: in FF80+ RFP covers this, and non-RFP users should use font vis
// [NOTE] In FF81+ the whitelist **overrides** RFP's font visibility
// https://bugzilla.mozilla.org/1121643 ***/
// user_pref("font.system.whitelist", ""); // [HIDDEN PREF]
// >>>>>>>>>>>>>>>>>>>>>
// HEADERS / REFERERS
// >>>>>>>>>>>>>>>>>>>>>
// 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); // [DEFAULT: 2]
// -------------------------------------
// 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", 2); // [DEFAULT: 0]
// -------------------------------------
// CROSS ORIGIN: control when to send a 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 ***/
user_pref("network.http.referer.XOriginPolicy", 2);
// -------------------------------------
// CROSS ORIGIN: control the amount of 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); // [DEFAULT: 0]
// -------------------------------------
// 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]
// -------------------------------------
// 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
// https://www.w3.org/TR/referrer-policy/
// https://developer.mozilla.org/docs/Web/HTTP/Headers/Referrer-Policy
// https://blog.mozilla.org/security/2018/01/31/preventing-data-leaks-by-stripping-path-information-in-http-referrers/ ***/
// user_pref("network.http.referer.defaultPolicy", 3); // [DEFAULT: 3]
// user_pref("network.http.referer.defaultPolicy.pbmode", 2); // [DEFAULT: 2]
// -------------------------------------
// TOR: hide (not spoof) referrer when leaving a .onion domain [FF54+]
// [NOTE] Firefox cannot access .onion sites by default. We recommend you use
// the Tor Browser which is specifically designed for hidden services
// https://bugzilla.mozilla.org/1305144 ***/
user_pref("network.http.referer.hideOnionSource", true);
// -------------------------------------
// ALL: enable the DNT (Do Not Track) HTTP header
// [NOTE] DNT is enforced with Enhanced Tracking Protection regardless of this pref
// [SETTING] Privacy & Security>Enhanced Tracking Protection>Send websites a "Do Not Track" signal... ***/
user_pref("privacy.donottrackheader.enabled", false);
// >>>>>>>>>>>>>>>>>>>>>
// CONTAINERS
// >>>>>>>>>>>>>>>>>>>>>
// Enable Container Tabs setting in preferences [FF50+]
// https://bugzilla.mozilla.org/1279029 ***/
user_pref("privacy.userContext.ui.enabled", true);
// -------------------------------------
// Enable Container Tabs [FF50+]
// [SETTING] General>Tabs>Enable Container Tabs ***/
user_pref("privacy.userContext.enabled", true);
// -------------------------------------
// 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);
// >>>>>>>>>>>>>>>>>>>>>
// PLUGINS ***/
// >>>>>>>>>>>>>>>>>>>>>
// 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 ***/
user_pref("plugin.state.flash", 0);
// -------------------------------------
// Disable GMP (Gecko Media Plugins)
// https://wiki.mozilla.org/GeckoMediaPlugins ***/
user_pref("media.gmp-provider.enabled", false);
// -------------------------------------
// Disable widevine CDM (Content Decryption Module)
// [SETUP-WEB] if you *need* CDM, e.g. Netflix, Amazon Prime, Hulu, whatever ***/
user_pref("media.gmp-widevinecdm.visible", false);
user_pref("media.gmp-widevinecdm.enabled", false);
user_pref("media.gmp-manager.url", "");
user_pref("media.gmp-manager.url.override", "");
// -------------------------------------
// Disable all DRM content (EME: Encryption Media Extension)
// [SETUP-WEB] if you *need* EME, e.g. Netflix, Amazon Prime, Hulu, whatever
// [SETTING] General>DRM Content>Play DRM-controlled content
// 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);
// >>>>>>>>>>>>>>>>>>>>>
// MEDIA / CAMERA / MIC ***/
// >>>>>>>>>>>>>>>>>>>>>
// Disable WebRTC (Web Real-Time Communication)
// [SETUP-WEB] WebRTC can leak your IP address from behind your VPN, but if this is not
// in your threat model, and you want Real-Time Communication, this is the pref for you
// https://www.privacytools.io/#webrtc ***/
user_pref("media.peerconnection.enabled", false);
// -------------------------------------
// Limit WebRTC IP leaks if using WebRTC
// In FF70+ these settings match Mode 4 (Mode 3 in older versions)
// [TEST] https://browserleaks.com/webrtc
// https://bugzilla.mozilla.org/buglist.cgi?bug_id=1189041,1297416,1452713
// https://wiki.mozilla.org/Media/WebRTC/Privacy
// https://tools.ietf.org/html/draft-ietf-rtcweb-ip-handling-12#section-5.2 ***/
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+]
// -------------------------------------
// 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
// https://www.contextis.com/resources/blog/webgl-new-dimension-browser-exploitation/
// https://security.stackexchange.com/questions/13799/is-webgl-a-security-concern ***/
user_pref("webgl.disabled", true);
user_pref("webgl.enable-webgl2", false);
// -------------------------------------
// Limit WebGL ***/
user_pref("webgl.min_capability_mode", true);
user_pref("webgl.disable-fail-if-major-performance-caveat", true);
// -------------------------------------
// Disable screensharing ***/
user_pref("media.getusermedia.screensharing.enabled", false);
user_pref("media.getusermedia.browser.enabled", false);
user_pref("media.getusermedia.audiocapture.enabled", false);
// -------------------------------------
// Set a default permission for Camera/Microphone [FF58+]
// 0=always ask (default), 1=allow, 2=block
// [SETTING] to add site exceptions: Page Info>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);
// -------------------------------------
// 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+)
// [NOTE] You can set exceptions under site permissions
// [SETTING] Privacy & Security>Permissions>Autoplay>Settings>Default for all websites ***/
// user_pref("media.autoplay.default", 5);
// -------------------------------------
// Disable autoplay of HTML5 media if you interacted with the site [FF78+]
// 0=sticky (default), 1=transient, 2=user
// [NOTE] If you have trouble with some video sites, then add an exception
// https://support.mozilla.org/questions/1293231 ***/
user_pref("media.autoplay.blocking_policy", 2);
// >>>>>>>>>>>>>>>>>>>>>
// WINDOW MEDDLING & LEAKS / POPUPS ***/
// >>>>>>>>>>>>>>>>>>>>>
// Prevent scripts from moving and resizing open windows ***/
user_pref("dom.disable_window_move_resize", true);
// -------------------------------------
// 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
// 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);
// -------------------------------------
// 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);
// -------------------------------------
// Block popup windows
// [SETTING] Privacy & Security>Permissions>Block pop-up windows ***/
user_pref("dom.disable_open_during_load", true);
// -------------------------------------
// Limit events that can cause a popup [SETUP-WEB]
// default is "change click dblclick auxclick mouseup pointerup notificationclick reset submit touchend contextmenu" ***/
user_pref("dom.popup_allowed_events", "click dblclick");
// >>>>>>>>>>>>>>>>>>>>>
// WEB WORKERS
// >>>>>>>>>>>>>>>>>>>>>
// 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
// 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.
// [SETUP-WEB] Disabling service workers will break some sites. This pref is required true for
// service worker notifications, push notifications and service worker
// cache. If you enable this pref, then check those settings as well ***/
user_pref("dom.serviceWorkers.enabled", false);
// -------------------------------------
// Disable Web Notifications
// [NOTE] Web Notifications can also use service workers and are behind a prompt
// https://developer.mozilla.org/docs/Web/API/Notifications_API ***/
// user_pref("dom.webnotifications.enabled", false); // [FF22+]
// user_pref("dom.webnotifications.serviceworker.enabled", false); // [FF44+]
// -------------------------------------
// 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.
// [NOTE] Push requires service workers to subscribe to and display, and is behind
// a prompt. 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.
// https://support.mozilla.org/en-US/kb/push-notifications-firefox
// https://developer.mozilla.org/en-US/docs/Web/API/Push_API ***/
user_pref("dom.push.enabled", false);
user_pref("dom.push.connection.enabled", false);
user_pref("dom.push.serverURL", "");
user_pref("dom.push.userAgentID", "");
// -------------------------------------
// Set a default permission for Notifications [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: Page Info>Permissions>Receive Notifications
// [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Notifications>Settings ***/
// user_pref("permissions.default.desktop-notification", 2);
// >>>>>>>>>>>>>>>>>>>>>
// DOM (DOCUMENT OBJECT MODEL) & JAVASCRIPT ***/
// >>>>>>>>>>>>>>>>>>>>>
// 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);
// -------------------------------------
// 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] If both 'middlemouse.paste' and 'general.autoScroll' are true (at least one
// is default false) then enabling this pref can leak clipboard content
// https://bugzilla.mozilla.org/1528289 */
user_pref("dom.event.clipboardevents.enabled", false);
// -------------------------------------
// Disable clipboard commands (cut/copy) from "non-privileged" content [FF41+]
// this disables document.execCommand("cut"/"copy") to protect your clipboard
// https://bugzilla.mozilla.org/1170911 ***/
user_pref("dom.allow_cut_copy", false);
// -------------------------------------
// Disable "Confirm you want to leave" dialog on page close
// Does not prevent JS leaks of the page close event.
// https://developer.mozilla.org/docs/Web/Events/beforeunload
// https://support.mozilla.org/questions/1043508 ***/
user_pref("dom.disable_beforeunload", true);
// -------------------------------------
// Disable shaking the screen ***/
user_pref("dom.vibrator.enabled", false);
// -------------------------------------
// Dsable asm.js [FF22+] [SETUP-PERF]
// http://asmjs.org/
// https://www.mozilla.org/security/advisories/mfsa2015-29/
// https://www.mozilla.org/security/advisories/mfsa2015-50/
// https://www.mozilla.org/security/advisories/mfsa2017-01/#CVE-2017-5375
// https://www.mozilla.org/security/advisories/mfsa2017-05/#CVE-2017-5400
// https://rh0dev.github.io/blog/2017/the-return-of-the-jit/ ***/
user_pref("javascript.options.asmjs", false);
// -------------------------------------
// 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
// 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]
// -------------------------------------
// Disable WebAssembly [FF52+] [SETUP-PERF]
// Vulnerabilities have increasingly been found, including those known and fixed
// in native programs years ago. 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
// https://developer.mozilla.org/docs/WebAssembly
// https://spectrum.ieee.org/tech-talk/telecom/security/more-worries-over-the-security-of-web-assembly
// https://www.zdnet.com/article/half-of-the-websites-using-webassembly-use-it-for-malicious-purposes ***/
user_pref("javascript.options.wasm", false);
// -------------------------------------
// 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+]
// >>>>>>>>>>>>>>>>>>>>>
// HARDWARE FINGERPRINTING ***/
// >>>>>>>>>>>>>>>>>>>>>
// 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
// https://bugzilla.mozilla.org/1313580 ***/
user_pref("dom.battery.enabled", false);
// -------------------------------------
// Disable media device enumeration [FF29+]
// [NOTE] media.peerconnection.enabled should also be set to false
// https://wiki.mozilla.org/Media/getUserMedia
// https://developer.mozilla.org/docs/Web/API/MediaDevices/enumerateDevices ***/
user_pref("media.navigator.enabled", false);
// -------------------------------------
// 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
// https://wiki.mozilla.org/Platform/GFX/HardwareAcceleration ***/
// user_pref("gfx.direct2d.disabled", true); // [WINDOWS]
// user_pref("layers.acceleration.disabled", true);
// -------------------------------------
// Disable Web Audio API [FF51+]
// https://bugzilla.mozilla.org/1288359 ***/
user_pref("dom.webaudio.enabled", false);
// -------------------------------------
// Disable Media Capabilities API [FF63+]
// [WARNING] This *may* affect media performance if disabled, no one is sure
// https://github.com/WICG/media-capabilities
// https://wicg.github.io/media-capabilities/#security-privacy-considerations ***/
// user_pref("media.media-capabilities.enabled", false);
// -------------------------------------
// Disable virtual reality devices
// Optional protection depending on your connected devices
// https://developer.mozilla.org/docs/Web/API/WebVR_API ***/
// user_pref("dom.vr.enabled", false);
// -------------------------------------
// Set a default permission for Virtual Reality [FF73+]
// 0=always ask (default), 1=allow, 2=block
// [SETTING] to add site exceptions: Page Info>Permissions>Access Virtual Reality Devices
// [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Virtual Reality>Settings ***/
// user_pref("permissions.default.xr", 0);
// >>>>>>>>>>>>>>>>>>>>>
// MISCELLANEOUS ***/
// >>>>>>>>>>>>>>>>>>>>>
// Prevent accessibility services from accessing your browser [RESTART]
// [SETTING] Privacy & Security>Permissions>Prevent accessibility services from accessing your browser (FF80 or lower)
// https://support.mozilla.org/kb/accessibility-services ***/
user_pref("accessibility.force_disabled", 1);
// -------------------------------------
// Disable sending additional analytics to web servers
// https://developer.mozilla.org/docs/Web/API/Navigator/sendBeacon ***/
user_pref("beacon.enabled", false);
// -------------------------------------
// Rremove temp files opened with an external application
// https://bugzilla.mozilla.org/302433 ***/
user_pref("browser.helperApps.deleteTempFileOnExit", true);
// -------------------------------------
// Disable page thumbnail collection
// look in profile/thumbnails directory - you may want to clean that out ***/
user_pref("browser.pagethumbnails.capturing_disabled", true); // [HIDDEN PREF]
// -------------------------------------
// Disable UITour backend so there is no chance that a remote page can use it ***/
user_pref("browser.uitour.enabled", false);
user_pref("browser.uitour.url", "");
// -------------------------------------
// Disable various developer tools in browser context
// [SETTING] Devtools>Advanced Settings>Enable browser chrome and add-on debugging toolboxes
// https://github.com/pyllyukko/user.js/issues/179#issuecomment-246468676 ***/
user_pref("devtools.chrome.enabled", false);
// -------------------------------------
// Reset remote debugging to disabled
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16222 ***/
user_pref("devtools.debugger.remote-enabled", false); // [DEFAULT: false]
user_pref("devtools.webide.autoinstallADBHelper", false);
// -------------------------------------
// Disable MathML (Mathematical Markup Language) [FF51+] [SETUP-HARDEN]
// [TEST] https://arkenfox.github.io/TZP/tzp.html#misc
// https://bugzilla.mozilla.org/1173199 ***/
// user_pref("mathml.disabled", true);
// -------------------------------------
// Disable in-content SVG (Scalable Vector Graphics) [FF53+]
// [WARNING] Expect breakage incl. youtube player controls. Best left for a "hardened" profile.
// https://bugzilla.mozilla.org/1216893 ***/
// user_pref("svg.disabled", true);
// -------------------------------------
// Disable middle mouse click opening links from clipboard
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/10089 ***/
user_pref("middlemouse.contentLoadURL", false);
// -------------------------------------
// Limit HTTP redirects (this does not control redirects with HTML meta tags or JS)
// [NOTE] A low setting of 5 or under will probably break some sites (e.g. gmail logins)
// To control HTML Meta tag and JS redirects, use an extension. Default is 20 ***/
user_pref("network.http.redirection-limit", 10);
// -------------------------------------
// Disable websites overriding Firefox's keyboard shortcuts [FF58+]
// 0 (default) or 1=allow, 2=block
// [SETTING] to add site exceptions: Page Info>Permissions>Override Keyboard Shortcuts ***/
// user_pref("permissions.default.shortcuts", 2);
// -------------------------------------
// Remove special permissions for certain mozilla domains [FF35+]
// resource://app/defaults/permissions ***/
user_pref("permissions.manager.defaultsUrl", "");
// -------------------------------------
// Remove webchannel whitelist ***/
user_pref("webchannel.allowObject.urlWhitelist", "");
// -------------------------------------
// Enforce Punycode for Internationalized Domain Names to eliminate possible spoofing
// Firefox has *some* protections, but it is better to be safe than sorry
// [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)
// https://wiki.mozilla.org/IDN_Display_Algorithm
// https://en.wikipedia.org/wiki/IDN_homograph_attack
// CVE-2017-5383: https://www.mozilla.org/security/advisories/mfsa2017-02/
// https://www.xudongz.com/blog/2017/idn-phishing/ ***/
user_pref("network.IDN_show_punycode", true);
// -------------------------------------
// Enforce Firefox's built-in PDF reader [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)
// Exploits are rare (1 serious case in 4 yrs), 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)
// [SETTING] General>Applications>Portable Document Format (PDF) ***/
user_pref("pdfjs.disabled", false); // [DEFAULT: false]
// -------------------------------------
// Disable links launching Windows Store on Windows 8/8.1/10 [WINDOWS] ***/
user_pref("network.protocol-handler.external.ms-windows-store", false);
// -------------------------------------
// 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]
// -------------------------------------
// 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
// https://groups.google.com/forum/#!topic/mozilla.dev.platform/BdFOMAuCGW8/discussion */
user_pref("permissions.delegation.enabled", false);
// >>>>>>>>>>>>>>>>>>>>>
// DOWNLOADS ***/
// >>>>>>>>>>>>>>>>>>>>>
// 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);
// -------------------------------------
// Enforce 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);
// -------------------------------------
// Disable adding downloads to the system's "recent documents" list ***/
user_pref("browser.download.manager.addToRecentDocs", false);
// -------------------------------------
// Disable hiding mime types (Options>General>Applications) not associated with a plugin ***/
user_pref("browser.download.hide_plugins_without_extensions", 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
// https://bugzilla.mozilla.org/1281959 ***/
// user_pref("browser.download.forbid_open_with", true);
// >>>>>>>>>>>>>>>>>>>>>
// EXTENSIONS ***/
// >>>>>>>>>>>>>>>>>>>>>
// 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
// https://mike.kaply.com/2012/02/21/understanding-add-on-scopes/
// archived: https://archive.is/DYjAM ***/
user_pref("extensions.enabledScopes", 5); // [HIDDEN PREF]
user_pref("extensions.autoDisableScopes", 15); // [DEFAULT: 15]
// -------------------------------------
// Disable webextension restrictions on certain mozilla domains [FF60+]
// https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/
// user_pref("extensions.webextensions.restrictedDomains", "");
// >>>>>>>>>>>>>>>>>>>>>
// SECURITY ***/
// >>>>>>>>>>>>>>>>>>>>>
// Enforce CSP (Content Security Policy)
// [WARNING] CSP is a very important and widespread security feature. Don't disable it!
// https://developer.mozilla.org/docs/Web/HTTP/CSP ***/
user_pref("security.csp.enable", true); // [DEFAULT: true]
// -------------------------------------
// Enforce a security delay on some confirmation dialogs such as install, open/save
// https://www.squarefree.com/2004/07/01/race-conditions-in-security-dialogs/ ***/
user_pref("security.dialog_enable_delay", 700);
// >>>>>>>>>>>>>>>>>>>>>
// PERSISTENT STORAGE
// >>>>>>>>>>>>>>>>>>>>>
// Disable 3rd-party cookies and site-data [SETUP-WEB]
// 0=Accept cookies and site data, 1=(Block) All third-party cookies, 2=(Block) All cookies,
// 3=(Block) Cookies from unvisited websites, 4=(Block) Cross-site and social media trackers (default)
// [NOTE] You can set exceptions under site permissions or use an extension
// [NOTE] Enforcing category to custom ensures ETP related prefs are always honored
// [SETTING] Privacy & Security>Enhanced Tracking Protection>Custom>Cookies ***/
user_pref("network.cookie.cookieBehavior", 1);
user_pref("browser.contentblocking.category", "custom");
// -------------------------------------
// Set third-party cookies (i.e ALL) (if enabled) to session-only
// [NOTE] .sessionOnly overrides .nonsecureSessionOnly except when .sessionOnly=false and
// .nonsecureSessionOnly=true. This allows you to keep HTTPS cookies, but session-only HTTP ones
// https://feeding.cloud.geek.nz/posts/tweaking-cookies-for-privacy-in-firefox/ ***/
user_pref("network.cookie.thirdparty.sessionOnly", true);
user_pref("network.cookie.thirdparty.nonsecureSessionOnly", true); // [FF58+]
// -------------------------------------
// Delete cookies and site data on close
// 0=keep until they expire (default), 2=keep until you close Firefox
// [NOTE] The setting below is disabled (but not changed) if you block all cookies
// [SETTING] Privacy & Security>Cookies and Site Data>Delete cookies and site data when Firefox is closed ***/
user_pref("network.cookie.lifetimePolicy", 2);
// -------------------------------------
// 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);
// -------------------------------------
// Disable offline cache ***/
user_pref("browser.cache.offline.enable", false);
// -------------------------------------
// Disable service worker cache and cache storage
// [NOTE] We clear service worker cache on exiting Firefox
// https://w3c.github.io/ServiceWorker/#privacy ***/
// user_pref("dom.caches.enabled", false);
// -------------------------------------
// Disable Storage API [FF51+]
// The API gives sites the ability to find out how much space they can use, how much
// they are already using, and even control whether or not they need to be alerted
// before the user agent disposes of site data in order to make room for other things.
// https://developer.mozilla.org/docs/Web/API/StorageManager
// https://developer.mozilla.org/docs/Web/API/Storage_API
// https://blog.mozilla.org/l10n/2017/03/07/firefox-l10n-report-aurora-54/ ***/
// user_pref("dom.storageManager.enabled", false);
// -------------------------------------
// Disable Storage Access API [FF65+]
// https://developer.mozilla.org/en-US/docs/Web/API/Storage_Access_API ***/
// user_pref("dom.storage_access.enabled", false);
// >>>>>>>>>>>>>>>>>>>>>
// SHUTDOWN
// >>>>>>>>>>>>>>>>>>>>>
// Enable Firefox to clear items on shutdown
// [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes ***/
user_pref("privacy.sanitize.sanitizeOnShutdown", true);
// -------------------------------------
// Set what items to clear on shutdown [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 ***/
user_pref("privacy.clearOnShutdown.cache", true);
user_pref("privacy.clearOnShutdown.cookies", true);
user_pref("privacy.clearOnShutdown.downloads", true); // see note above
user_pref("privacy.clearOnShutdown.formdata", true); // Form & Search History
user_pref("privacy.clearOnShutdown.history", true); // Browsing & Download History
user_pref("privacy.clearOnShutdown.offlineApps", true); // Offline Website Data
user_pref("privacy.clearOnShutdown.sessions", true); // Active Logins
user_pref("privacy.clearOnShutdown.siteSettings", true); // Site Preferences
// -------------------------------------
// Reset default items to clear with Ctrl-Shift-Del [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' ***/
user_pref("privacy.cpd.cache", true);
user_pref("privacy.cpd.cookies", true);
// user_pref("privacy.cpd.downloads", true); // not used, see note above
user_pref("privacy.cpd.formdata", true); // Form & Search History
user_pref("privacy.cpd.history", true); // Browsing & Download History
user_pref("privacy.cpd.offlineApps", true); // Offline Website Data
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
// -------------------------------------
// Clear Session Restore data when sanitizing on shutdown or manually [FF34+]
// [NOTE] Not needed if Session Restore is not used or is already cleared with history
// [NOTE] privacy.clearOnShutdown.openWindows prevents resuming from crashes
// [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);
// -------------------------------------
// Reset default 'Time range to clear' for 'Clear Recent History'
// 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 ***/
user_pref("privacy.sanitize.timeSpan", 0);
// >>>>>>>>>>>>>>>>>>>>>
// FPI (FIRST PARTY ISOLATION)
// >>>>>>>>>>>>>>>>>>>>>
// Enable First Party Isolation [FF51+]
// [SETUP-WEB] May break cross-domain logins and site functionality until perfected
// https://bugzilla.mozilla.org/1260931
// https://bugzilla.mozilla.org/1299996 [META] ***/
user_pref("privacy.firstparty.isolate", true);
// -------------------------------------
// Enforce FPI restriction for window.opener [FF54+]
// [NOTE] Setting this to false may reduce the breakage
// FF65+ blocks postMessage with targetOrigin "*" if originAttributes don't match. But
// to reduce breakage it ignores the 1st-party domain (FPD) originAttribute
// The 2nd pref removes that limitation and will only allow communication if FPDs also match.
// https://bugzilla.mozilla.org/1319773#c22
// https://bugzilla.mozilla.org/1492607
// https://developer.mozilla.org/en-US/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);
// -------------------------------------
// Enable site partitioning (FF78+)
// https://bugzilla.mozilla.org/1590107 [META] */
user_pref("privacy.partition.network_state", true);
// >>>>>>>>>>>>>>>>>>>>>
// RFP (RESIST FINGERPRINTING)
// >>>>>>>>>>>>>>>>>>>>>
// 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.
// https://bugzilla.mozilla.org/418986 ***/
user_pref("privacy.resistFingerprinting", true);
// -------------------------------------
// 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
// https://bugzilla.mozilla.org/1330882
// https://hardware.metrics.mozilla.com/ ***/
// user_pref("privacy.window.maxInnerWidth", 1000);
// user_pref("privacy.window.maxInnerHeight", 1000);
// -------------------------------------
// Disable mozAddonManager Web API [FF57+]
// [NOTE] As a side-effect in FF57-59 this allowed extensions to work on AMO. In FF60+ you also need
// to sanitize or clear extensions.webextensions.restrictedDomains to keep that side-effect
// https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/
user_pref("privacy.resistFingerprinting.block_mozAddonManager", true); // [HIDDEN PREF]
// -------------------------------------
// Enable RFP letterboxing [FF67+]
// Dynamically resizes the inner window by applying margins in stepped ranges
// If you use the dimension pref, then it will only apply those resolutions. The format is
// "width1xheight1, width2xheight2, ..." (e.g. "800x600, 1000x1000, 1600x900")
// [WARNING] The dimension pref is only meant for testing, and we recommend you DO NOT USE it
// https://bugzilla.mozilla.org/1407366
// 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]
// -------------------------------------
// Disable showing about:blank as soon as possible during startup [FF60+]
// When default true this no longer masks the RFP chrome resizing activity
// https://bugzilla.mozilla.org/1448423 ***/
user_pref("browser.startup.blankWindow", false);
// -------------------------------------
// 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]
// >>>>>>>>>>>>>>>>>>>>>
// RFP ALTERNATIVES
// >>>>>>>>>>>>>>>>>>>>>
// Spoof (or limit?) number of CPU cores [FF48+]
// [NOTE] *may* affect core chrome/Firefox performance, will affect content.
// https://bugzilla.mozilla.org/1008453
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21675
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/22127
// https://html.spec.whatwg.org/multipage/workers.html#navigator.hardwareconcurrency
// user_pref("dom.maxHardwareConcurrency", 2);
// -------------------------------------
// Disable resource/navigation timing
user_pref("dom.enable_resource_timing", false);
// -------------------------------------
// Disable timing attacks
// https://wiki.mozilla.org/Security/Reviews/Firefox/NavigationTimingAPI
user_pref("dom.enable_performance", false);
// -------------------------------------
// 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("device.sensors.enabled", false);
// -------------------------------------
// 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);
// -------------------------------------
// Disable gamepad API - USB device ID enumeration
// Optional protection depending on your connected devices
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/13023
// user_pref("dom.gamepad.enabled", false);
// -------------------------------------
// Disable giving away network info [FF31+]
// e.g. bluetooth, cellular, ethernet, wifi, wimax, other, mixed, unknown, none
// https://developer.mozilla.org/docs/Web/API/Network_Information_API
// https://wicg.github.io/netinfo/
// https://bugzilla.mozilla.org/960426
user_pref("dom.netinfo.enabled", false); // [DEFAULT: true on Android]
// -------------------------------------
// Disable the SpeechSynthesis (Text-to-Speech) part of the Web Speech API
// https://developer.mozilla.org/docs/Web/API/Web_Speech_API
// https://developer.mozilla.org/docs/Web/API/SpeechSynthesis
// https://wiki.mozilla.org/HTML5_Speech_API
user_pref("media.webspeech.synth.enabled", false);
// -------------------------------------
// Disable video statistics - JS performance fingerprinting [FF25+]
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/15757
// https://bugzilla.mozilla.org/654550
user_pref("media.video_stats.enabled", false);
// -------------------------------------
// Disable touch events
// fingerprinting attack vector - leaks screen res & actual screen coordinates
// 0=disabled, 1=enabled, 2=autodetect
// Optional protection depending on your device
// https://developer.mozilla.org/docs/Web/API/Touch_events
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/10286
// user_pref("dom.w3c_touch_events.enabled", 0);
// -------------------------------------
// Disable MediaDevices change detection [FF51+]
// https://developer.mozilla.org/docs/Web/Events/devicechange
// https://developer.mozilla.org/docs/Web/API/MediaDevices/ondevicechange
user_pref("media.ondevicechange.enabled", false);
// -------------------------------------
// Disable WebGL debug info being available to websites
// https://bugzilla.mozilla.org/1171228
// https://developer.mozilla.org/docs/Web/API/WEBGL_debug_renderer_info
user_pref("webgl.enable-debug-renderer-info", false);
// -------------------------------------
// Enforce prefers-reduced-motion as no-preference [FF63+] [RESTART]
// 0=no-preference, 1=reduce
user_pref("ui.prefersReducedMotion", 0); // [HIDDEN PREF]
// -------------------------------------
// Disable PointerEvents
// https://developer.mozilla.org/en-US/docs/Web/API/PointerEvent
user_pref("dom.w3c_pointer_events.enabled", false);
// -------------------------------------
// 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
// https://bugzilla.mozilla.org/buglist.cgi?bug_id=232227,1330876
user_pref("ui.use_standins_for_native_colors", true);
// -------------------------------------
// Enforce prefers-color-scheme as light [FF67+]
// 0=light, 1=dark : This overrides your OS value
user_pref("ui.systemUsesDarkTheme", 0); // [HIDDEN PREF]
// -------------------------------------
// Limit font visbility (non-ANDROID) [FF79+]
// Uses hardcoded lists with two parts: kBaseFonts + kLangPackFonts
// 1=only base system fonts, 2=also fonts from optional language packs, 3=also user-installed fonts
// [NOTE] Bundled fonts are auto-allowed
// https://searchfox.org/mozilla-central/search?path=StandardFonts*.inc
user_pref("layout.css.font-visibility.level", 1);
// >>>>>>>>>>>>>>>>>>>>>
// RFP ALTERNATIVES (NAVIGATOR / USER AGENT SPOOFING)
// >>>>>>>>>>>>>>>>>>>>>
// Navigator DOM object overrides
// [WARNING] DO NOT USE ***/
// 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]
// >>>>>>>>>>>>>>>>>>>>>
// PERSONAL
// >>>>>>>>>>>>>>>>>>>>>
user_pref("browser.startup.homepage_override.mstone", "ignore"); // master switch
user_pref("startup.homepage_welcome_url", "");
user_pref("startup.homepage_welcome_url.additional", "");
user_pref("startup.homepage_override_url", ""); // What's New page after updates
// >>>>>>>>>>>>>>>>>>>>>
// WARNINGS ***/
// >>>>>>>>>>>>>>>>>>>>>
user_pref("browser.tabs.warnOnClose", false);
user_pref("browser.tabs.warnOnCloseOtherTabs", false);
user_pref("browser.tabs.warnOnOpen", false);
user_pref("full-screen-api.warning.delay", 0);
user_pref("full-screen-api.warning.timeout", 0);
user_pref("browser.warnOnQuit", false);
// >>>>>>>>>>>>>>>>>>>>>
// APPEARANCE ***/
// >>>>>>>>>>>>>>>>>>>>>
// user_pref("browser.download.autohideButton", false); // [FF57+]
// user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true); // [FF68+] allow userChrome/userContent
// >>>>>>>>>>>>>>>>>>>>>
// CONTENT BEHAVIOR ***/
// >>>>>>>>>>>>>>>>>>>>>
user_pref("accessibility.typeaheadfind", false); // enable "Find As You Type"
user_pref("clipboard.autocopy", false); // disable autocopy default [LINUX]
user_pref("layout.spellcheckDefault", 0); // 0=none, 1-multi-line, 2=multi-line & single-line
// >>>>>>>>>>>>>>>>>>>>>
// UX BEHAVIOR ***/
// >>>>>>>>>>>>>>>>>>>>>
// user_pref("browser.backspace_action", 2); // 0=previous page, 1=scroll up, 2=do nothing
// user_pref("browser.tabs.closeWindowWithLastTab", false);
// user_pref("browser.tabs.loadBookmarksInTabs", true); // open bookmarks in a new tab [FF57+]
// user_pref("browser.urlbar.decodeURLsOnCopy", true); // see bugzilla 1320061 [FF53+]
// 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 ***/
// >>>>>>>>>>>>>>>>>>>>>
user_pref("browser.messaging-system.whatsNewPanel.enabled", false); // What's New [FF69+]
user_pref("messaging-system.rsexperimentloader.enabled", false);
user_pref("extensions.pocket.enabled", false); // Pocket Account [FF46+]
user_pref("identity.fxaccounts.enabled", false); // Firefox Accounts & Sync [FF60+] [RESTART]
user_pref("reader.parse-on-load.enabled", false); // Reader View
// >>>>>>>>>>>>>>>>>>>>>
// OTHER ***/
// user_pref("browser.bookmarks.max_backups", 2);
user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false); // disable CFR [FF67+]
user_pref("browser.newtabpage.activity-stream.improvesearch.topSiteSearchShortcuts.searchEngines" "");
// [SETTING] General>Browsing>Recommend extensions as you browse
user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", false); // disable CFR [FF67+]
// [SETTING] General>Browsing>Recommend features as you browse
user_pref("network.manage-offline-status", false); // see bugzilla 620472
// user_pref("xpinstall.signatures.required", false); // enforced extension signing (Nightly/ESR)
// >>>>>>>>>>>>>>>>>>>>>
// DEPRECATED / REMOVED / LEGACY / RENAMED
// >>>>>>>>>>>>>>>>>>>>>
// ESR78.x still uses all the following prefs
// [NOTE] replace the * with a slash in the line above to re-enable them
// FF79
// 0212: enforce fallback text encoding to match en-US
// When the content or server doesn't declare a charset the browser will
// fallback to the "Current locale" based on your application language
// [TEST] https://hsivonen.com/test/moz/check-charset.htm
// https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/20025
// https://bugzilla.mozilla.org/1603712
user_pref("intl.charset.fallback.override", "windows-1252");
// FF82
// Disable geographically specific results/search engines e.g. "browser.search.*.US"
// i.e. ignore all of Mozilla's various search engines in multiple locales
// https://bugzilla.mozilla.org/1619926
user_pref("browser.search.geoSpecificDefaults", false);
user_pref("browser.search.geoSpecificDefaults.url", "");
// >>>>>>>>>>>>>>>>>>>>>
//