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@ -1,7 +1,7 @@
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/******
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* name: arkenfox user.js
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* date: 6 November 2022
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* version: 106
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* date: 9 January 2023
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* version: 108
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* url: https://github.com/arkenfox/user.js
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* license: MIT: https://github.com/arkenfox/user.js/blob/master/LICENSE.txt
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@ -110,13 +110,6 @@ user_pref("geo.provider.ms-windows-location", false); // [WINDOWS]
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user_pref("geo.provider.use_corelocation", false); // [MAC]
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user_pref("geo.provider.use_gpsd", false); // [LINUX]
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user_pref("geo.provider.use_geoclue", false); // [FF102+] [LINUX]
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/* 0203: disable region updates
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* [1] https://firefox-source-docs.mozilla.org/toolkit/modules/toolkit_modules/Region.html ***/
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user_pref("browser.region.network.url", ""); // [FF78+]
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user_pref("browser.region.update.enabled", false); // [FF79+]
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/* 0204: set search region
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* [NOTE] May not be hidden if Firefox has changed your settings due to your region (0203) ***/
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// user_pref("browser.search.region", "US"); // [HIDDEN PREF]
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/* 0210: set preferred language for displaying pages
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* [SETTING] General>Language and Appearance>Language>Choose your preferred language...
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* [TEST] https://addons.mozilla.org/about ***/
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@ -268,6 +261,7 @@ user_pref("_user.js.parrot", "0700 syntax error: the parrot's given up the ghost
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/* 0701: disable IPv6
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* IPv6 can be abused, especially with MAC addresses, and can leak with VPNs: assuming
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* your ISP and/or router and/or website is IPv6 capable. Most sites will fall back to IPv4
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* [SETUP-WEB] PR_CONNECT_RESET_ERROR: this pref *might* be the cause
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* [STATS] Firefox telemetry (Sept 2022) shows ~8% of successful connections are IPv6
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* [NOTE] This is an application level fallback. Disabling IPv6 is best done at an
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* OS/network level, and/or configured properly in VPN setups. If you are not masking your IP,
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@ -477,7 +471,7 @@ user_pref("security.OCSP.require", true);
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user_pref("security.family_safety.mode", 0);
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/* 1223: enable strict PKP (Public Key Pinning)
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* 0=disabled, 1=allow user MiTM (default; such as your antivirus), 2=strict
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* [SETUP-WEB] MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE: If you rely on an AV (antivirus) to protect
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* [SETUP-WEB] MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE
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* your web browsing by inspecting ALL your web traffic, then override to current default ***/
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user_pref("security.cert_pinning.enforcement_level", 2);
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/* 1224: enable CRLite [FF73+]
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@ -491,8 +485,8 @@ user_pref("security.remote_settings.crlite_filters.enabled", true);
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user_pref("security.pki.crlite_mode", 2);
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/** MIXED CONTENT ***/
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/* 1241: disable insecure passive content (such as images) on https pages [SETUP-WEB] ***/
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user_pref("security.mixed_content.block_display_content", true);
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/* 1241: disable insecure passive content (such as images) on https pages ***/
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// user_pref("security.mixed_content.block_display_content", true); // Defense-in-depth (see 1244)
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/* 1244: enable HTTPS-Only mode in all windows [FF76+]
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* When the top-level is HTTPS, insecure subresources are also upgraded (silent fail)
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* [SETTING] to add site exceptions: Padlock>HTTPS-Only mode>On (after "Continue to HTTP Site")
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@ -565,10 +559,8 @@ user_pref("privacy.userContext.ui.enabled", true);
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/*** [SECTION 2000]: PLUGINS / MEDIA / WEBRTC ***/
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user_pref("_user.js.parrot", "2000 syntax error: the parrot's snuffed it!");
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/* 2001: disable WebRTC (Web Real-Time Communication)
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* Firefox uses mDNS hostname obfuscation on desktop (except Windows7/8) and the
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* private IP is NEVER exposed, except if required in TRUSTED scenarios; i.e. after
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* you grant device (microphone or camera) access
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* [SETUP-HARDEN] Test first. Windows7/8 users only: behind a proxy who never use WebRTC
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* Firefox desktop uses mDNS hostname obfuscation and the private IP is never exposed until
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* required in TRUSTED scenarios; i.e. after you grant device (microphone or camera) access
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* [TEST] https://browserleaks.com/webrtc
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* [1] https://groups.google.com/g/discuss-webrtc/c/6stQXi72BEU/m/2FwZd24UAQAJ
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* [2] https://datatracker.ietf.org/doc/html/draft-ietf-mmusic-mdns-ice-candidates#section-3.1.1 ***/
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@ -603,10 +595,7 @@ user_pref("media.eme.enabled", false);
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user_pref("_user.js.parrot", "2400 syntax error: the parrot's kicked the bucket!");
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/* 2402: prevent scripts from moving and resizing open windows ***/
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user_pref("dom.disable_window_move_resize", true);
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/* 2403: block popup windows
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* [SETTING] Privacy & Security>Permissions>Block pop-up windows ***/
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user_pref("dom.disable_open_during_load", true);
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/* 2404: limit events that can cause a popup [SETUP-WEB] ***/
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/* 2404: limit events that can cause a pop-up [SETUP-WEB] ***/
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user_pref("dom.popup_allowed_events", "click dblclick mousedown pointerdown");
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/*** [SECTION 2600]: MISCELLANEOUS ***/
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@ -614,9 +603,6 @@ user_pref("_user.js.parrot", "2600 syntax error: the parrot's run down the curta
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/* 2601: prevent accessibility services from accessing your browser [RESTART]
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* [1] https://support.mozilla.org/kb/accessibility-services ***/
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user_pref("accessibility.force_disabled", 1);
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/* 2602: disable sending additional analytics to web servers
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* [1] https://developer.mozilla.org/docs/Web/API/Navigator/sendBeacon ***/
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user_pref("beacon.enabled", false);
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/* 2603: remove temp files opened with an external application
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* [1] https://bugzilla.mozilla.org/302433 ***/
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user_pref("browser.helperApps.deleteTempFileOnExit", true);
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@ -624,7 +610,7 @@ user_pref("browser.helperApps.deleteTempFileOnExit", true);
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user_pref("browser.pagethumbnails.capturing_disabled", true); // [HIDDEN PREF]
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/* 2606: disable UITour backend so there is no chance that a remote page can use it ***/
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user_pref("browser.uitour.enabled", false);
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user_pref("browser.uitour.url", "");
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// user_pref("browser.uitour.url", ""); // Defense-in-depth
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/* 2608: reset remote debugging to disabled
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* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16222 ***/
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user_pref("devtools.debugger.remote-enabled", false); // [DEFAULT: false]
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@ -648,16 +634,16 @@ user_pref("webchannel.allowObject.urlWhitelist", "");
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* [3] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=punycode+firefox
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* [4] https://www.xudongz.com/blog/2017/idn-phishing/ ***/
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user_pref("network.IDN_show_punycode", true);
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/* 2620: enforce PDFJS, disable PDFJS scripting [SETUP-CHROME]
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/* 2620: enforce PDFJS, disable PDFJS scripting
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* This setting controls if the option "Display in Firefox" is available in the setting below
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* and by effect controls whether PDFs are handled in-browser or externally ("Ask" or "Open With")
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* PROS: pdfjs is lightweight, open source, and more secure/vetted than most
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* Exploits are rare (one serious case in seven years), treated seriously and patched quickly.
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* [WHY] pdfjs is lightweight, open source, and secure: the last exploit was June 2015 [1]
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* It doesn't break "state separation" of browser content (by not sharing with OS, independent apps).
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* It maintains disk avoidance and application data isolation. It's convenient. You can still save to disk.
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* CONS: You may prefer a different pdf reader for security reasons
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* CAVEAT: JS can still force a pdf to open in-browser by bundling its own code
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* [SETTING] General>Applications>Portable Document Format (PDF) ***/
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* [NOTE] JS can still force a pdf to open in-browser by bundling its own code
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* [SETUP-CHROME] You may prefer a different pdf reader for security/workflow reasons
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* [SETTING] General>Applications>Portable Document Format (PDF)
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* [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=pdf.js+firefox ***/
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user_pref("pdfjs.disabled", false); // [DEFAULT: false]
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user_pref("pdfjs.enableScripting", false); // [FF86+]
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/* 2621: disable links launching Windows Store on Windows 8/8.1/10 [WINDOWS] ***/
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@ -717,8 +703,8 @@ user_pref("browser.contentblocking.category", "strict");
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/* 2710: enable state partitioning of service workers [FF96+] ***/
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user_pref("privacy.partition.serviceWorkers", true); // [DEFAULT: true FF105+]
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/* 2720: enable APS (Always Partitioning Storage) ***/
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user_pref("privacy.partition.always_partition_third_party_non_cookie_storage", true); // [FF104+]
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user_pref("privacy.partition.always_partition_third_party_non_cookie_storage.exempt_sessionstorage", false); // [FF105+]
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user_pref("privacy.partition.always_partition_third_party_non_cookie_storage", true); // [FF104+] [DEFAULT: true FF109+]
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user_pref("privacy.partition.always_partition_third_party_non_cookie_storage.exempt_sessionstorage", false); // [FF105+] [DEFAULT: false FF109+]
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/*** [SECTION 2800]: SHUTDOWN & SANITIZING ***/
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user_pref("_user.js.parrot", "2800 syntax error: the parrot's bleedin' demised!");
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@ -809,7 +795,6 @@ user_pref("privacy.sanitize.timeSpan", 0);
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1382545 - reduce fingerprinting in Animation API
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1354633 - limit MediaError.message to a whitelist
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FF58+
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967895 - spoof canvas and enable site permission prompt (FF58)
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1372073 - spoof/block fingerprinting in MediaDevices API (FF59)
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Spoof: enumerate devices as one "Internal Camera" and one "Internal Microphone"
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Block: suppresses the ondevicechange event
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@ -833,6 +818,7 @@ user_pref("privacy.sanitize.timeSpan", 0);
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531915 - use fdlibm's sin, cos and tan in jsmath (FF93, ESR91.1)
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1756280 - enforce navigator.pdfViewerEnabled as true and plugins/mimeTypes as hard-coded values (FF100)
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1692609 - reduce JS timing precision to 16.67ms (previously FF55+ was 100ms) (FF102)
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1422237 - return "srgb" with color-gamut (FF110)
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***/
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user_pref("_user.js.parrot", "4500 syntax error: the parrot's popped 'is clogs");
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/* 4501: enable privacy.resistFingerprinting [FF41+]
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@ -925,7 +911,7 @@ user_pref("_user.js.parrot", "5000 syntax error: the parrot's taken 'is last bow
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/* 5005: disable intermediate certificate caching [FF41+] [RESTART]
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* [NOTE] This affects login/cert/key dbs. The effect is all credentials are session-only.
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* Saved logins and passwords are not available. Reset the pref and restart to return them ***/
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// user_pref("security.nocertdb", true); // [HIDDEN PREF in FF101 or lower]
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// user_pref("security.nocertdb", true);
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/* 5006: disable favicons in history and bookmarks
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* [NOTE] Stored as data blobs in favicons.sqlite, these don't reveal anything that your
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* actual history (and bookmarks) already do. Your history is more detailed, so
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@ -1038,21 +1024,24 @@ user_pref("privacy.firstparty.isolate", false); // [DEFAULT: false]
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* In FF96+ these are listed in about:compat
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* [1] https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/ ***/
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user_pref("extensions.webcompat.enable_shims", true); // [DEFAULT: true]
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/* 6010: enforce/reset TLS 1.0/1.1 downgrades to session only
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* [NOTE] In FF97+ the TLS 1.0/1.1 downgrade UX was removed
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/* 6010: enforce no TLS 1.0/1.1 downgrades
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* [TEST] https://tls-v1-1.badssl.com:1010/ ***/
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user_pref("security.tls.version.enable-deprecated", false); // [DEFAULT: false]
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/* 6011: enforce disabling of Web Compatibility Reporter [FF56+]
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* Web Compatibility Reporter adds a "Report Site Issue" button to send data to Mozilla
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* [WHY] To prevent wasting Mozilla's time with a custom setup ***/
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user_pref("extensions.webcompat-reporter.enabled", false); // [DEFAULT: false]
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/* 6050: prefsCleaner: reset items removed from arkenfox FF102+ ***/
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/* 6050: prefsCleaner: reset previously active items removed from arkenfox FF102+ ***/
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// user_pref("beacon.enabled", "");
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// user_pref("browser.newtab.preload", "");
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// user_pref("browser.newtabpage.activity-stream.feeds.discoverystreamfeed", "");
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// user_pref("browser.newtabpage.activity-stream.feeds.snippets", "");
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// user_pref("browser.region.network.url", "");
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// user_pref("browser.region.update.enabled", "");
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// user_pref("browser.ssl_override_behavior", "");
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// user_pref("devtools.chrome.enabled", "");
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// user_pref("dom.disable_beforeunload", "");
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// user_pref("dom.disable_open_during_load", "");
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// user_pref("extensions.formautofill.available", "");
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// user_pref("extensions.formautofill.addresses.supported", "");
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// user_pref("extensions.formautofill.creditCards.available", "");
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@ -1082,8 +1071,8 @@ user_pref("_user.js.parrot", "7000 syntax error: the parrot's pushing up daisies
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/* 7003: disable non-modern cipher suites [1]
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* [WHY] Passive fingerprinting. Minimal/non-existent threat of downgrade attacks
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* [1] https://browserleaks.com/ssl ***/
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// user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha", false);
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// user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false);
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// user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false); // [DEFAULT: false FF109+]
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// user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha", false); // [DEFAULT: false FF109+]
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// user_pref("security.ssl3.ecdhe_rsa_aes_128_sha", false);
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// user_pref("security.ssl3.ecdhe_rsa_aes_256_sha", false);
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// user_pref("security.ssl3.rsa_aes_128_gcm_sha256", false); // no PFS
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@ -1097,7 +1086,7 @@ user_pref("_user.js.parrot", "7000 syntax error: the parrot's pushing up daisies
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/* 7005: disable SSL session IDs [FF36+]
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* [WHY] Passive fingerprinting and perf costs. These are session-only
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* and isolated with network partitioning (FF85+) and/or containers ***/
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// user_pref("security.ssl.disable_session_identifiers", true); // [HIDDEN PREF in FF101 or lower]
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// user_pref("security.ssl.disable_session_identifiers", true);
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/* 7006: onions
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* [WHY] Firefox doesn't support hidden services. Use Tor Browser ***/
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// user_pref("dom.securecontext.allowlist_onions", true); // [FF97+] 1382359/1744006
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@ -1146,8 +1135,7 @@ user_pref("_user.js.parrot", "7000 syntax error: the parrot's pushing up daisies
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// user_pref("privacy.trackingprotection.cryptomining.enabled", true); // [DEFAULT: true]
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// user_pref("privacy.trackingprotection.fingerprinting.enabled", true); // [DEFAULT: true]
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/* 7017: disable service workers
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* [WHY] Already isolated (FF96+) with TCP (2701) behind a pref (2710)
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* or blocked with TCP in 3rd parties (FF95 or lower) ***/
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* [WHY] Already isolated with TCP (2701) behind a pref (2710) ***/
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// user_pref("dom.serviceWorkers.enabled", false);
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/* 7018: disable Web Notifications
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* [WHY] Web Notifications are behind a prompt (7002)
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@ -1198,6 +1186,9 @@ user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", fa
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user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", false);
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/* 9003: disable What's New toolbar icon [FF69+] ***/
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user_pref("browser.messaging-system.whatsNewPanel.enabled", false);
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/* 9004: disable seach terms [FF110+]
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* [SETTING] Search > SearchBar > Use the address bar for search and navigation > Show search terms instead of URL... ***/
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user_pref("browser.urlbar.showSearchTerms.enabled", false);
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/*** [SECTION 9999]: DEPRECATED / REMOVED / LEGACY / RENAMED
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Documentation denoted as [-]. Items deprecated prior to FF91 have been archived at [1]
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