/****** * name: arkenfox user.js * date: 7 June 2024 * version: 126 * urls: https://github.com/arkenfox/user.js [repo] * : https://arkenfox.github.io/gui/ [interactive] * license: MIT: https://github.com/arkenfox/user.js/blob/master/LICENSE.txt * INDEX: 0100: STARTUP 0200: GEOLOCATION 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 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+] user_pref("browser.newtabpage.activity-stream.showSponsoredTopSites", false); // [FF83+] Shortcuts>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 ***/ /* 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] [HIDDEN PREF] 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); /* 0323: disable shopping experience [FF116+] * [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1840156#c0 ***/ user_pref("browser.shopping.experience2023.enabled", false); // [DEFAULT: 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", ""); /* 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://bugzilla.mozilla.org/1413868 ***/ 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. From FF87-117, by default only sftp was accepted * [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] [DEFAULT: "" FF118+] /* 0710: enable DNS-over-HTTPS (DoH) [FF60+] * 0=default, 2=increased (TRR (Trusted Recursive Resolver) first), 3=max (TRR only), 5=off (no rollout) * 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 ***/ /* 0801: disable location bar making speculative connections [FF56+] * [1] https://bugzilla.mozilla.org/1348275 ***/ user_pref("browser.urlbar.speculativeConnect.enabled", false); /* 0803: disable live search suggestions * [NOTE] Both must be true for live search to work in the location bar * [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 urlbar trending search suggestions [FF118+] * [SETTING] Search>Search Suggestions>Show trending search suggestions (FF119) ***/ user_pref("browser.urlbar.trending.featureGate", false); /* 0806: disable urlbar suggestions ***/ user_pref("browser.urlbar.addons.featureGate", false); // [FF115+] user_pref("browser.urlbar.mdn.featureGate", false); // [FF117+] [HIDDEN PREF] user_pref("browser.urlbar.pocket.featureGate", false); // [FF116+] [DEFAULT: false] user_pref("browser.urlbar.weather.featureGate", false); // [FF108+] [DEFAULT: 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); /* 0815: disable tab-to-search [FF85+] * Alternatively, you can exclude on a per-engine basis by unchecking them in Options>Search * [SETTING] Search>Address Bar>When using the address bar, suggest>Search engines ***/ user_pref("browser.urlbar.suggest.engines", false); /* 0830: enable separate default search engine in Private Windows and its UI setting * [SETTING] Search>Default Search Engine>Choose a different default search engine for Private Windows only ***/ user_pref("browser.search.separatePrivateDefault", true); // [FF70+] user_pref("browser.search.separatePrivateDefault.ui.enabled", true); // [FF71+] /*** [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 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 (May 2024) reports over 99.7% 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" (default) * [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 * 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 ***/ /* 2603: remove temp files opened from non-PB windows with an external application * [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=302433,1738574 ***/ user_pref("browser.download.start_downloads_in_tmp_dir", true); // [FF102+] 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+] /* 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] /* 2630: disable content analysis by DLP (Data Loss Prevention) agents * DLP agents are background processes on managed computers that allow enterprises to monitor locally running * applications for data exfiltration events, which they can allow/block based on customer defined DLP policies. * [1] https://github.com/chromium/content_analysis_sdk */ user_pref("browser.contentanalysis.default_allow", false); // [FF124+] [DEFAULT: false] /** 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"); // [HIDDEN PREF] /*** [SECTION 2800]: SHUTDOWN & SANITIZING ***/ /** SANITIZE SITE DATA: IGNORES "ALLOW" SITE EXCEPTIONS ***/ /* 2820: set manual "Clear Data" items [SETUP-CHROME] [FF128+] * Firefox remembers your last choices. This will reset them when you start Firefox * [SETTING] Privacy & Security>Browser Privacy>Cookies and Site Data>Clear Data ***/ user_pref("privacy.clearSiteData.cache", true); user_pref("privacy.clearSiteData.cookiesAndStorage", false); // keep false until it respects "allow" site exceptions user_pref("privacy.clearSiteData.historyFormDataAndDownloads", true); /** SANITIZE HISTORY: IGNORES "ALLOW" SITE EXCEPTIONS | clearHistory migration is FF128+ ***/ /* 2830: set manual "Clear History" items, also via Ctrl-Shift-Del [SETUP-CHROME] * 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" * [SETTING] Privacy & Security>History>Custom Settings>Clear History ***/ user_pref("privacy.cpd.cache", true); // [DEFAULT: true] user_pref("privacy.clearHistory.cache", true); user_pref("privacy.cpd.formdata", true); // [DEFAULT: true] user_pref("privacy.cpd.history", true); // [DEFAULT: true] user_pref("privacy.clearHistory.historyFormDataAndDownloads", true); user_pref("privacy.cpd.cookies", true); user_pref("privacy.cpd.sessions", true); // [DEFAULT: true] user_pref("privacy.cpd.offlineApps", false); // [DEFAULT: false] user_pref("privacy.clearHistory.cookiesAndStorage", false); user_pref("privacy.cpd.siteSettings", true); /** SANITIZE MANUAL: TIMERANGE ***/ /* 2840: set "Time range to clear" for "Clear Data" (2820) and "Clear History" (2830) * 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"); // [HIDDEN PREF] /* 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); /* 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.firefox-view", false); user_pref("browser.tabs.firefox-view-next", false); user_pref("browser.tabs.warnOnClose", true); user_pref("browser.toolbars.bookmarks.visibility", "never"); user_pref("browser.translations.automaticallyPopup", false); user_pref("browser.promo.focus.enabled", false); user_pref("browser.promo.pin.enabled", false); user_pref("browser.vpn_promo.enabled", false); 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);