path: root/debian/local/pref/user.js

/******
*    name: arkenfox user.js
*    date: 27 August 2023
* version: 115
*     url: https://github.com/arkenfox/user.js
* license: MIT: https://github.com/arkenfox/user.js/blob/master/LICENSE.txt

* INDEX:

  0100: STARTUP
  0200: GEOLOCATION / LANGUAGE / LOCALE
  0300: QUIETER FOX
  0400: SAFE BROWSING
  0600: BLOCK IMPLICIT OUTBOUND
  0700: DNS / DoH / PROXY / SOCKS
  0800: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS
  0900: PASSWORDS
  1000: DISK AVOIDANCE
  1200: HTTPS (SSL/TLS / OCSP / CERTS / HPKP)
  1700: CONTAINERS
  2400: DOM (DOCUMENT OBJECT MODEL)
  2600: MISCELLANEOUS
  2700: ETP (ENHANCED TRACKING PROTECTION)
  2800: SHUTDOWN & SANITIZING
  5000: OPTIONAL OPSEC
  9000: NON-PROJECT RELATED

******/

/* 0000: disable about:config warning ***/
user_pref("browser.aboutConfig.showWarning", false);

/*** [SECTION 0100]: STARTUP ***/
/* 0102: set startup page [SETUP-CHROME]
 * 0=blank, 1=home, 2=last visited page, 3=resume previous session
 * [NOTE] Session Restore is cleared with history (2811), and not used in Private Browsing mode
 * [SETTING] General>Startup>Restore previous session ***/
user_pref("browser.startup.page", 3);
/* 0103: set HOME+NEWWINDOW page
 * about:home=Firefox Home (default, see 0105), custom URL, about:blank
 * [SETTING] Home>New Windows and Tabs>Homepage and new windows ***/
user_pref("browser.startup.homepage", "about:blank");
/* 0104: set NEWTAB page
 * true=Firefox Home (default, see 0105), false=blank page
 * [SETTING] Home>New Windows and Tabs>New tabs ***/
user_pref("browser.newtabpage.enabled", false);
/* 0105: disable sponsored content on Firefox Home (Activity Stream)
 * [SETTING] Home>Firefox Home Content ***/
user_pref("browser.newtabpage.activity-stream.showSponsored", false); // [FF58+] Pocket > Sponsored Stories
user_pref("browser.newtabpage.activity-stream.showSponsoredTopSites", false); // [FF83+] Sponsored shortcuts
/* 0106: clear default topsites
 * [NOTE] This does not block you from adding your own ***/
user_pref("browser.newtabpage.activity-stream.default.sites", "");

/*** [SECTION 0200]: GEOLOCATION / LANGUAGE / LOCALE ***/
/* 0201: use Mozilla geolocation service instead of Google if permission is granted [FF74+]
 * Optionally enable logging to the console (defaults to false) ***/
user_pref("geo.provider.network.url", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
/* 0202: disable using the OS's geolocation service ***/
user_pref("geo.provider.use_gpsd", false); // [LINUX]
user_pref("geo.provider.use_geoclue", false); // [FF102+] [LINUX]

/*** [SECTION 0300]: QUIETER FOX ***/
/** RECOMMENDATIONS ***/
/* 0320: disable recommendation pane in about:addons (uses Google Analytics) ***/
user_pref("extensions.getAddons.showPane", false); // [HIDDEN PREF]
/* 0321: disable recommendations in about:addons' Extensions and Themes panes [FF68+] ***/
user_pref("extensions.htmlaboutaddons.recommendations.enabled", false);
/* 0322: disable personalized Extension Recommendations in about:addons and AMO [FF65+]
 * [NOTE] This pref has no effect when Health Reports (0331) are disabled
 * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to make personalized extension recommendations
 * [1] https://support.mozilla.org/kb/personalized-extension-recommendations ***/
user_pref("browser.discovery.enabled", false);

/** TELEMETRY ***/
/* 0330: disable new data submission [FF41+]
 * If disabled, no policy is shown or upload takes place, ever
 * [1] https://bugzilla.mozilla.org/1195552 ***/
user_pref("datareporting.policy.dataSubmissionEnabled", false);
/* 0331: disable Health Reports
 * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send technical... data ***/
user_pref("datareporting.healthreport.uploadEnabled", false);
/* 0332: disable telemetry
 * The "unified" pref affects the behavior of the "enabled" pref
 * - If "unified" is false then "enabled" controls the telemetry module
 * - If "unified" is true then "enabled" only controls whether to record extended data
 * [NOTE] "toolkit.telemetry.enabled" is now LOCKED to reflect prerelease (true) or release builds (false) [2]
 * [1] https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html
 * [2] https://medium.com/georg-fritzsche/data-preference-changes-in-firefox-58-2d5df9c428b5 ***/
user_pref("toolkit.telemetry.unified", false);
user_pref("toolkit.telemetry.enabled", false); // see [NOTE]
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+]
/* 0333: disable Telemetry Coverage
 * [1] https://blog.mozilla.org/data/2018/08/20/effectively-measuring-search-in-firefox/ ***/
user_pref("toolkit.telemetry.coverage.opt-out", true); // [HIDDEN PREF]
user_pref("toolkit.coverage.opt-out", true); // [FF64+] [HIDDEN PREF]
user_pref("toolkit.coverage.endpoint.base", "");
/* 0334: disable PingCentre telemetry (used in several System Add-ons) [FF57+]
 * Defense-in-depth: currently covered by 0331 ***/
user_pref("browser.ping-centre.telemetry", false);
/* 0335: disable Firefox Home (Activity Stream) telemetry ***/
user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false);
user_pref("browser.newtabpage.activity-stream.telemetry", false);

/** STUDIES ***/
/* 0340: disable Studies
 * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to install and run studies ***/
user_pref("app.shield.optoutstudies.enabled", false);
/* 0341: disable Normandy/Shield [FF60+]
 * Shield is a telemetry system that can push and test "recipes"
 * [1] https://mozilla.github.io/normandy/ ***/
user_pref("app.normandy.enabled", false);
user_pref("app.normandy.api_url", "");

/** CRASH REPORTS ***/
/* 0350: disable Crash Reports ***/
user_pref("breakpad.reportURL", "");
user_pref("browser.tabs.crashReporting.sendReport", false); // [FF44+]
/* 0351: enforce no submission of backlogged Crash Reports [FF58+]
 * [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send backlogged crash reports  ***/
user_pref("browser.crashReports.unsubmittedCheck.autoSubmit2", false); // [DEFAULT: false]

/** OTHER ***/
/* 0360: disable Captive Portal detection
 * [1] https://www.eff.org/deeplinks/2017/08/how-captive-portals-interfere-wireless-security-and-privacy ***/
user_pref("captivedetect.canonicalURL", "");
user_pref("network.captive-portal-service.enabled", false); // [FF52+]
/* 0361: disable Network Connectivity checks [FF65+]
 * [1] https://bugzilla.mozilla.org/1460537 ***/
user_pref("network.connectivity-service.enabled", false);

/*** [SECTION 0400]: SAFE BROWSING (SB)
   SB has taken many steps to preserve privacy. If required, a full url is never sent
   to Google, only a part-hash of the prefix, hidden with noise of other real part-hashes.
   Firefox takes measures such as stripping out identifying parameters and since SBv4 (FF57+)
   doesn't even use cookies. (#Turn on browser.safebrowsing.debug to monitor this activity)

   [1] https://feeding.cloud.geek.nz/posts/how-safe-browsing-works-in-firefox/
   [2] https://wiki.mozilla.org/Security/Safe_Browsing
   [3] https://support.mozilla.org/kb/how-does-phishing-and-malware-protection-work
   [4] https://educatedguesswork.org/posts/safe-browsing-privacy/
***/
/* 0401: disable SB (Safe Browsing)
 * [WARNING] Do this at your own risk! These are the master switches
 * [SETTING] Privacy & Security>Security>... Block dangerous and deceptive content ***/
user_pref("browser.safebrowsing.malware.enabled", false);
user_pref("browser.safebrowsing.phishing.enabled", false);
/* 0402: disable SB checks for downloads (both local lookups + remote)
 * This is the master switch for the safebrowsing.downloads* prefs (0403, 0404)
 * [SETTING] Privacy & Security>Security>... "Block dangerous downloads" ***/
user_pref("browser.safebrowsing.downloads.enabled", false);
/* 0403: disable SB checks for downloads (remote)
 * To verify the safety of certain executable files, Firefox may submit some information about the
 * file, including the name, origin, size and a cryptographic hash of the contents, to the Google
 * Safe Browsing service which helps Firefox determine whether or not the file should be blocked
 * [SETUP-SECURITY] If you do not understand this, or you want this protection, then override this ***/
user_pref("browser.safebrowsing.downloads.remote.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.url", ""); // Defense-in-depth
/* 0404: disable SB checks for unwanted software
 * [SETTING] Privacy & Security>Security>... "Warn you about unwanted and uncommon software" ***/
user_pref("browser.safebrowsing.downloads.remote.block_potentially_unwanted", false);
user_pref("browser.safebrowsing.downloads.remote.block_uncommon", false);
/* 0405: disable "ignore this warning" on SB warnings [FF45+]
 * If clicked, it bypasses the block for that session. This is a means for admins to enforce SB
 * [TEST] see https://github.com/arkenfox/user.js/wiki/Appendix-A-Test-Sites#-mozilla
 * [1] https://bugzilla.mozilla.org/1226490 ***/
user_pref("browser.safebrowsing.allowOverride", true);

/*** [SECTION 0600]: BLOCK IMPLICIT OUTBOUND [not explicitly asked for - e.g. clicked on] ***/
/* 0601: disable link prefetching
 * [1] https://developer.mozilla.org/docs/Web/HTTP/Link_prefetching_FAQ ***/
user_pref("network.prefetch-next", false);
/* 0602: disable DNS prefetching
 * [1] https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control ***/
user_pref("network.dns.disablePrefetch", true);
/* 0603: disable predictor / prefetching ***/
user_pref("network.predictor.enabled", false);
user_pref("network.predictor.enable-prefetch", false); // [FF48+] [DEFAULT: false]
/* 0604: disable link-mouseover opening connection to linked server
 * [1] https://news.slashdot.org/story/15/08/14/2321202/how-to-quash-firefoxs-silent-requests ***/
user_pref("network.http.speculative-parallel-limit", 0);
/* 0605: disable mousedown speculative connections on bookmarks and history [FF98+] ***/
user_pref("browser.places.speculativeConnect.enabled", false);

/*** [SECTION 0700]: DNS / DoH / PROXY / SOCKS ***/
/* 0702: set the proxy server to do any DNS lookups when using SOCKS
 * e.g. in Tor, this stops your local DNS server from knowing your Tor destination
 * as a remote Tor node will handle the DNS request
 * [1] https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers ***/
user_pref("network.proxy.socks_remote_dns", true);
/* 0703: disable using UNC (Uniform Naming Convention) paths [FF61+]
 * [SETUP-CHROME] Can break extensions for profiles on network shares
 * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/26424 ***/
user_pref("network.file.disable_unc_paths", true); // [HIDDEN PREF]
/* 0704: disable GIO as a potential proxy bypass vector
 * Gvfs/GIO has a set of supported protocols like obex, network, archive, computer,
 * dav, cdda, gphoto2, trash, etc. By default only sftp is accepted (FF87+)
 * [1] https://bugzilla.mozilla.org/1433507
 * [2] https://en.wikipedia.org/wiki/GVfs
 * [3] https://en.wikipedia.org/wiki/GIO_(software) ***/
user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF]
/* 0710: disable DNS-over-HTTPS (DoH) rollout [FF60+]
 * 0=default, 2=increased (TRR (Trusted Recursive Resolver) first), 3=max (TRR only), 5=off
 * see "doh-rollout.home-region": USA 2019, Canada 2021, Russia/Ukraine 2022 [3]
 * [SETTING] Privacy & Security>DNS over HTTPS
 * [1] https://hacks.mozilla.org/2018/05/a-cartoon-intro-to-dns-over-https/
 * [2] https://wiki.mozilla.org/Security/DOH-resolver-policy
 * [3] https://support.mozilla.org/en-US/kb/firefox-dns-over-https
 * [4] https://www.eff.org/deeplinks/2020/12/dns-doh-and-odoh-oh-my-year-review-2020 ***/
user_pref("network.trr.mode", 5);

/*** [SECTION 0800]: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS ***/
/* 0802: 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); // [DEFAULT: false FF104+]
/* 0804: disable live search suggestions
 * [NOTE] Both must be true for the location bar to work
 * [SETUP-CHROME] Override 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);
/* 0805: disable location bar making speculative connections [FF56+]
 * [1] https://bugzilla.mozilla.org/1348275 ***/
user_pref("browser.urlbar.speculativeConnect.enabled", false);
/* 0806: disable location bar leaking single words to a DNS provider **after searching** [FF78+]
 * 0=never resolve, 1=use heuristics, 2=always resolve
 * [1] https://bugzilla.mozilla.org/1642623 ***/
user_pref("browser.urlbar.dnsResolveSingleWordsAfterSearch", 0); // [DEFAULT: 0 FF104+]
/* 0807: disable location bar contextual suggestions [FF92+]
 * [SETTING] Privacy & Security>Address Bar>Suggestions from...
 * [1] https://blog.mozilla.org/data/2021/09/15/data-and-firefox-suggest/ ***/
user_pref("browser.urlbar.suggest.quicksuggest.nonsponsored", false); // [FF95+]
user_pref("browser.urlbar.suggest.quicksuggest.sponsored", false);
/* 0808: disable tab-to-search [FF85+]
 * Alternatively, you can exclude on a per-engine basis by unchecking them in Options>Search
 * [SETTING] Privacy & Security>Address Bar>When using the address bar, suggest>Search engines ***/
user_pref("browser.urlbar.suggest.engines", false);
/* 0810: disable search and form history
 * [SETUP-WEB] Be aware that autocomplete form data can be read by third parties [1][2]
 * [NOTE] We also clear formdata on exit (2811)
 * [SETTING] Privacy & Security>History>Custom Settings>Remember search and form history
 * [1] https://blog.mindedsecurity.com/2011/10/autocompleteagain.html
 * [2] https://bugzilla.mozilla.org/381681 ***/
user_pref("browser.formfill.enable", false);

/*** [SECTION 0900]: PASSWORDS
   [1] https://support.mozilla.org/kb/use-primary-password-protect-stored-logins-and-pas
***/
/* 0903: disable auto-filling username & password form fields
 * can leak in cross-site forms *and* be spoofed
 * [NOTE] Username & password is still available when you enter the field
 * [SETTING] Privacy & Security>Logins and Passwords>Autofill logins and passwords
 * [1] https://freedom-to-tinker.com/2017/12/27/no-boundaries-for-user-identities-web-trackers-exploit-browser-login-managers/
 * [2] https://homes.esat.kuleuven.be/~asenol/leaky-forms/ ***/
user_pref("signon.autofillForms", false);
/* 0904: disable formless login capture for Password Manager [FF51+] ***/
user_pref("signon.formlessCapture.enabled", false);
/* 0905: limit (or disable) HTTP authentication credentials dialogs triggered by sub-resources [FF41+]
 * hardens against potential credentials phishing
 * 0 = don't allow sub-resources to open HTTP authentication credentials dialogs
 * 1 = don't allow cross-origin sub-resources to open HTTP authentication credentials dialogs
 * 2 = allow sub-resources to open HTTP authentication credentials dialogs (default) ***/
user_pref("network.auth.subresource-http-auth-allow", 1);

/*** [SECTION 1000]: DISK AVOIDANCE ***/
/* 1006: disable favicons in shortcuts
 * URL shortcuts use a cached randomly named .ico file which is stored in your
 * profile/shortcutCache directory. The .ico remains after the shortcut is deleted
 * If set to false then the shortcuts use a generic Firefox icon ***/
user_pref("browser.shell.shortcutFavicons", false);

/*** [SECTION 1200]: HTTPS (SSL/TLS / OCSP / CERTS / HPKP)
   Your cipher and other settings can be used in server side fingerprinting
   [TEST] https://www.ssllabs.com/ssltest/viewMyClient.html
   [TEST] https://browserleaks.com/ssl
   [TEST] https://ja3er.com/
   [1] https://www.securityartwork.es/2017/02/02/tls-client-fingerprinting-with-bro/
***/
/** SSL (Secure Sockets Layer) / TLS (Transport Layer Security) ***/
/* 1201: require safe negotiation
 * Blocks connections to servers that don't support RFC 5746 [2] as they're potentially vulnerable to a
 * MiTM attack [3]. 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
 * [SETUP-WEB] SSL_ERROR_UNSAFE_NEGOTIATION: is it worth overriding this for that one site?
 * [STATS] SSL Labs (Feb 2023) reports over 99.3% of top sites have secure renegotiation [4]
 * [1] https://wiki.mozilla.org/Security:Renegotiation
 * [2] https://datatracker.ietf.org/doc/html/rfc5746
 * [3] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555
 * [4] https://www.ssllabs.com/ssl-pulse/ ***/
user_pref("security.ssl.require_safe_negotiation", true);
/* 1206: disable TLS1.3 0-RTT (round-trip time) [FF51+]
 * This data is not forward secret, as it is encrypted solely under keys derived using
 * the offered PSK. There are no guarantees of non-replay between connections
 * [1] https://github.com/tlswg/tls13-spec/issues/1001
 * [2] https://www.rfc-editor.org/rfc/rfc9001.html#name-replay-attacks-with-0-rtt
 * [3] https://blog.cloudflare.com/tls-1-3-overview-and-q-and-a/ ***/
user_pref("security.tls.enable_0rtt_data", false);

/** OCSP (Online Certificate Status Protocol)
   [1] https://scotthelme.co.uk/revocation-is-broken/
   [2] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
***/
/* 1211: enforce 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
 * [SETTING] Privacy & Security>Security>Certificates>Query OCSP responder servers...
 * [1] https://en.wikipedia.org/wiki/Ocsp ***/
user_pref("security.OCSP.enabled", 1); // [DEFAULT: 1]
/* 1212: set OCSP fetch failures (non-stapled, see 1211) to hard-fail
 * [SETUP-WEB] SEC_ERROR_OCSP_SERVER_ERROR
 * 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)
 * [1] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
 * [2] https://www.imperialviolet.org/2014/04/19/revchecking.html ***/
user_pref("security.OCSP.require", true);

/** CERTS / HPKP (HTTP Public Key Pinning) ***/
/* 1223: enable strict PKP (Public Key Pinning)
 * 0=disabled, 1=allow user MiTM (default; such as your antivirus), 2=strict
 * [SETUP-WEB] MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE ***/
user_pref("security.cert_pinning.enforcement_level", 2);
/* 1224: enable CRLite [FF73+]
 * 0 = disabled
 * 1 = consult CRLite but only collect telemetry
 * 2 = consult CRLite and enforce both "Revoked" and "Not Revoked" results
 * 3 = consult CRLite and enforce "Not Revoked" results, but defer to OCSP for "Revoked" (FF99+, default FF100+)
 * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1429800,1670985,1753071
 * [2] https://blog.mozilla.org/security/tag/crlite/ ***/
user_pref("security.remote_settings.crlite_filters.enabled", true);
user_pref("security.pki.crlite_mode", 2);

/** MIXED CONTENT ***/
/* 1244: enable HTTPS-Only mode in all windows [FF76+]
 * When the top-level is HTTPS, insecure subresources are also upgraded (silent fail)
 * [SETTING] to add site exceptions: Padlock>HTTPS-Only mode>On (after "Continue to HTTP Site")
 * [SETTING] Privacy & Security>HTTPS-Only Mode (and manage exceptions)
 * [TEST] http://example.com [upgrade]
 * [TEST] http://httpforever.com/ | http://http.rip [no upgrade] ***/
user_pref("dom.security.https_only_mode", true); // [FF76+]
/* 1246: disable HTTP background requests [FF82+]
 * When attempting to upgrade, if the server doesn't respond within 3 seconds, Firefox sends
 * a top-level HTTP request without path in order to check if the server supports HTTPS or not
 * This is done to avoid waiting for a timeout which takes 90 seconds
 * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1642387,1660945 ***/
user_pref("dom.security.https_only_mode_send_http_background_request", false);

/** UI (User Interface) ***/
/* 1270: display warning on the padlock for "broken security" (if 1201 is false)
 * Bug: warning padlock not indicated for subresources on a secure page! [2]
 * [1] https://wiki.mozilla.org/Security:Renegotiation
 * [2] https://bugzilla.mozilla.org/1353705 ***/
user_pref("security.ssl.treat_unsafe_negotiation_as_broken", true);
/* 1272: 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);

/*** [SECTION 1700]: CONTAINERS ***/
/* 1701: enable Container Tabs and its UI setting [FF50+]
 * [SETTING] General>Tabs>Enable Container Tabs
 * https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers ***/
user_pref("privacy.userContext.enabled", true);
user_pref("privacy.userContext.ui.enabled", true);

/*** [SECTION 2400]: DOM (DOCUMENT OBJECT MODEL) ***/
/* 2402: prevent scripts from moving and resizing open windows ***/
user_pref("dom.disable_window_move_resize", true);

/*** [SECTION 2600]: MISCELLANEOUS ***/
/* 2601: prevent accessibility services from accessing your browser [RESTART]
 * [1] https://support.mozilla.org/kb/accessibility-services ***/
user_pref("accessibility.force_disabled", 1);
/* 2603: remove temp files opened with an external application
 * [1] https://bugzilla.mozilla.org/302433 ***/
user_pref("browser.helperApps.deleteTempFileOnExit", true);
/* 2606: disable UITour backend so there is no chance that a remote page can use it ***/
user_pref("browser.uitour.enabled", false);
/* 2608: reset remote debugging to disabled
 * [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16222 ***/
user_pref("devtools.debugger.remote-enabled", false); // [DEFAULT: false]
/* 2616: remove special permissions for certain mozilla domains [FF35+]
 * [1] resource://app/defaults/permissions ***/
user_pref("permissions.manager.defaultsUrl", "");
/* 2617: remove webchannel whitelist ***/
user_pref("webchannel.allowObject.urlWhitelist", "");
/* 2619: use Punycode in Internationalized Domain Names to eliminate possible spoofing
 * [SETUP-WEB] Might be undesirable for non-latin alphabet users since legitimate IDN's are also punycoded
 * [TEST] https://www.xn--80ak6aa92e.com/ (www.apple.com)
 * [1] https://wiki.mozilla.org/IDN_Display_Algorithm
 * [2] https://en.wikipedia.org/wiki/IDN_homograph_attack
 * [3] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=punycode+firefox
 * [4] https://www.xudongz.com/blog/2017/idn-phishing/ ***/
user_pref("network.IDN_show_punycode", true);
/* 2620: enforce PDFJS, disable PDFJS scripting
 * 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")
 * [WHY] pdfjs is lightweight, open source, and secure: the last exploit was June 2015 [1]
 *   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.
 * [NOTE] JS can still force a pdf to open in-browser by bundling its own code
 * [SETUP-CHROME] You may prefer a different pdf reader for security/workflow reasons
 * [SETTING] General>Applications>Portable Document Format (PDF)
 * [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=pdf.js+firefox ***/
user_pref("pdfjs.disabled", false); // [DEFAULT: false]
user_pref("pdfjs.enableScripting", false); // [FF86+]
/* 2623: disable permissions delegation [FF73+]
 * Currently applies to cross-origin geolocation, camera, mic and screen-sharing
 * permissions, and fullscreen requests. Disabling delegation means any prompts
 * for these will show/use their correct 3rd party origin
 * [1] https://groups.google.com/forum/#!topic/mozilla.dev.platform/BdFOMAuCGW8/discussion ***/
user_pref("permissions.delegation.enabled", false);
/* 2624: disable middle click on new tab button opening URLs or searches using clipboard [FF115+] */
user_pref("browser.tabs.searchclipboardfor.middleclick", false); // [DEFAULT: false NON-LINUX]

/** DOWNLOADS ***/
/* 2652: disable downloads panel opening on every download [FF96+] ***/
user_pref("browser.download.alwaysOpenPanel", false);
/* 2653: disable adding downloads to the system's "recent documents" list ***/
user_pref("browser.download.manager.addToRecentDocs", false);
/* 2654: enable user interaction for security by always asking how to handle new mimetypes [FF101+]
 * [SETTING] General>Files and Applications>What should Firefox do with other files ***/
user_pref("browser.download.always_ask_before_handling_new_types", true);

/** EXTENSIONS ***/
/* 2661: disable bypassing 3rd party extension install prompts [FF82+]
 * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1659530,1681331 ***/
user_pref("extensions.postDownloadThirdPartyPrompt", false);

/*** [SECTION 2700]: ETP (ENHANCED TRACKING PROTECTION) ***/
/* 2701: enable ETP Strict Mode [FF86+]
 * ETP Strict Mode enables Total Cookie Protection (TCP)
 * [NOTE] Adding site exceptions disables all ETP protections for that site and increases the risk of
 * cross-site state tracking e.g. exceptions for SiteA and SiteB means PartyC on both sites is shared
 * [1] https://blog.mozilla.org/security/2021/02/23/total-cookie-protection/
 * [SETTING] to add site exceptions: Urlbar>ETP Shield
 * [SETTING] to manage site exceptions: Options>Privacy & Security>Enhanced Tracking Protection>Manage Exceptions ***/
user_pref("browser.contentblocking.category", "strict");
/* 2710: enable state partitioning of service workers [FF96+] ***/
user_pref("privacy.partition.serviceWorkers", true); // [DEFAULT: true FF105+]
/* 2720: enable APS (Always Partitioning Storage) ***/
user_pref("privacy.partition.always_partition_third_party_non_cookie_storage", true); // [FF104+] [DEFAULT: true FF109+]
user_pref("privacy.partition.always_partition_third_party_non_cookie_storage.exempt_sessionstorage", false); // [FF105+] [DEFAULT: false FF109+]

/*** [SECTION 2800]: SHUTDOWN & SANITIZING ***/
/** SANITIZE MANUAL: IGNORES "ALLOW" SITE EXCEPTIONS ***/
/* 2820: 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 "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);    // [DEFAULT: true]
user_pref("privacy.cpd.formdata", true); // [DEFAULT: true]
user_pref("privacy.cpd.history", true);  // [DEFAULT: true]
user_pref("privacy.cpd.sessions", true); // [DEFAULT: true]
user_pref("privacy.cpd.offlineApps", false); // [DEFAULT: false]
user_pref("privacy.cpd.cookies", true);
user_pref("privacy.cpd.siteSettings", true);
/* 2822: reset default "Time range to clear" for "Clear Recent History" (2820)
 * Firefox remembers your last choice. This will reset the value when you start Firefox
 * 0=everything, 1=last hour, 2=last two hours, 3=last four hours, 4=today
 * [NOTE] Values 5 (last 5 minutes) and 6 (last 24 hours) are not listed in the dropdown,
 * which will display a blank value, and are not guaranteed to work ***/
user_pref("privacy.sanitize.timeSpan", 1);

/*** [SECTION 5000]: OPTIONAL OPSEC
   Disk avoidance, application data isolation, eyeballs...
***/
/* 5018: limit events that can cause a pop-up ***/
user_pref("dom.popup_allowed_events", "click dblclick mousedown pointerdown");
/* 5019: disable page thumbnail collection ***/
user_pref("browser.pagethumbnails.capturing_disabled", true); // [HIDDEN PREF]
/* 5021: 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) ***/
user_pref("keyword.enabled", false);

/*** [SECTION 9000]: NON-PROJECT RELATED ***/
/* 9001: disable welcome notices ***/
user_pref("browser.startup.homepage_override.mstone", "ignore");
/* 9002: disable General>Browsing>Recommend extensions/features as you browse [FF67+] ***/
user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false);
user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", false);
/* 9003: disable What's New toolbar icon [FF69+] ***/
user_pref("browser.messaging-system.whatsNewPanel.enabled", false);
/* 9004: disable search terms [FF110+]
 * [SETTING] Search>Search Bar>Use the address bar for search and navigation>Show search terms instead of URL... ***/
user_pref("browser.urlbar.showSearchTerms.enabled", false);

user_pref("browser.tabs.warnOnClose", true);

user_pref("browser.toolbars.bookmarks.visibility", "never");

user_pref("extensions.pocket.enabled", false);

user_pref("full-screen-api.warning.delay", 0);
user_pref("full-screen-api.warning.timeout", 0);
user_pref("full-screen-api.transition.timeout", 0);

user_pref("general.smoothScroll", false);
user_pref("general.smoothScroll.lines", false);
user_pref("general.smoothScroll.mouseWheel", false);
user_pref("general.smoothScroll.other", false);
user_pref("general.smoothScroll.pages", false);
user_pref("general.smoothScroll.pixels", false);
user_pref("general.smoothScroll.scrollbars", false);
user_pref("toolkit.scrollbox.smoothScroll", false);

user_pref("layout.spellcheckDefault", 0);

user_pref("media.autoplay.default", 5);
user_pref("media.autoplay.blocking_policy", 2);

user_pref("network.http.max-connections", 1800);
user_pref("network.http.max-persistent-connections-per-proxy", 64);
user_pref("network.http.max-persistent-connections-per-server", 12);
user_pref("network.http.max-urgent-start-excessive-connections-per-host", 6);
user_pref("network.websocket.max-connections", 400);

user_pref("privacy.donottrackheader.enabled", true);

user_pref("signon.management.page.fileImport.enabled", true);