/****************************************************************************** * user.js * * https://github.com/pyllyukko/user.js * ******************************************************************************/ /***************************************************************************** * Avoid hardware based fingerprintings * * Canvas/Font's/Plugins * ******************************************************************************/ // https://wiki.mozilla.org/Platform/GFX/HardwareAcceleration // https://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html // https://github.com/dillbyrne/random-agent-spoofer/issues/74 pref("gfx.direct2d.disabled", true); pref("layers.acceleration.disabled", true); pref("gfx.downloadable_fonts.fallback_delay", -1); pref("intl.charset.default", "windows-1252"); pref("intl.locale.matchOS", false); pref("javascript.use_us_english_locale", true); pref("noscript.forbidFonts", true); /****************************************************************************** * HTML5 / APIs / DOM * * * ******************************************************************************/ // disable Location-Aware Browsing // http://www.mozilla.org/en-US/firefox/geolocation/ pref("geo.enabled", false); // Disable dom.mozTCPSocket.enabled (raw TCP socket support) // https://trac.torproject.org/projects/tor/ticket/18863 // https://www.mozilla.org/en-US/security/advisories/mfsa2015-97/ // https://developer.mozilla.org/docs/Mozilla/B2G_OS/API/TCPSocket pref("dom.mozTCPSocket.enabled", false); // Disable DOM Shared Workers // See https://bugs.torproject.org/15562 pref("dom.workers.sharedWorkers.enabled", false); // Disable WebSockets // https://www.infoq.com/news/2012/03/websockets-security // http://mdn.beonex.com/en/WebSockets.html pref("network.websocket.max-connections", 0); // Disable DOM Push API // https://developer.mozilla.org/en-US/docs/Web/API/Push_API // https://wiki.mozilla.org/Security/Reviews/Push_API // https://wiki.mozilla.org/Privacy/Reviews/Push_API // https://bugzilla.mozilla.org/show_bug.cgi?id=1038811 // https://bugzilla.mozilla.org/show_bug.cgi?id=1153499 pref("dom.push.enabled", false); pref("dom.push.serverURL", ""); pref("dom.push.userAgentID", ""); // https://hg.mozilla.org/releases/mozilla-beta/file/e549349b8d66/modules/libpref/init/all.js#l4237 pref("dom.push.connection.enabled", false); pref("dom.push.adaptive.enabled", false); pref("dom.push.udp.wakeupEnabled", false); // https://hg.mozilla.org/releases/mozilla-beta/file/00bcc10b3bdc/modules/libpref/init/all.js#l4445 // https://hg.mozilla.org/releases/mozilla-beta/file/00bcc10b3bdc/dom/push/PushRecord.jsm#l59 pref("dom.push.maxQuotaPerSubscription", 0); // https://wiki.mozilla.org/Security/Reviews/SimplePush pref("services.push.enabled", false); pref("services.push.serverURL", ""); // Disable Kinto Cloud // Note: Pref may change name in future release // https://bugzilla.mozilla.org/show_bug.cgi?id=1266235#c2 pref("services.kinto.base", ""); // Disable MDNS (Supposedly only for Android but is in Desktop version also) // https://hg.mozilla.org/releases/mozilla-beta/file/00bcc10b3bdc/dom/presentation/provider/MulticastDNSDeviceProvider.cpp#l18 pref("dom.presentation.discovery.enabled", false); pref("dom.presentation.discoverable", false); // http://kb.mozillazine.org/Dom.storage.enabled // http://dev.w3.org/html5/webstorage/#dom-localstorage // you can also see this with Panopticlick's "DOM localStorage" pref("dom.storage.enabled", false); // Whether JS can get information about the network/browser connection // Network Information API provides general information about the system's connection type (WiFi, cellular, etc.) // https://developer.mozilla.org/en-US/docs/Web/API/Network_Information_API // https://wicg.github.io/netinfo/#privacy-considerations // https://bugzilla.mozilla.org/show_bug.cgi?id=960426 pref("dom.netinfo.enabled", false); // fingerprinting due to differing OS implementations pref("dom.network.enabled", false); // Disable Web Audio API // https://bugzil.la/1288359 pref("dom.webaudio.enabled", false); // Audio_data is deprecated in future releases, but still present // in FF24. This is a dangerous combination (spotted by iSec) pref("media.audio_data.enabled", false); // Don't autoplay WebM and other embedded media files // https://support.mozilla.org/en-US/questions/1073167 pref("media.autoplay.enabled", false); pref("noscript.forbidMedia", true); // Don't reveal your internal IP // Check the settings with: http://net.ipcalf.com/ // https://wiki.mozilla.org/Media/WebRTC/Privacy pref("media.peerconnection.ice.default_address_only", true); // Firefox < 51 pref("media.peerconnection.ice.no_host", true); // Firefox >= 51 // Disable WebRTC entirely pref("media.peerconnection.enabled", false); // getUserMedia // https://wiki.mozilla.org/Media/getUserMedia pref("media.getusermedia.screensharing.allowed_domains", ""); pref("media.getusermedia.screensharing.enabled", false); // https://developer.mozilla.org/en-US/docs/Web/API/Navigator pref("media.navigator.enabled", false); // https://developer.mozilla.org/en-US/docs/Web/API/BatteryManager pref("dom.battery.enabled", false); // https://wiki.mozilla.org/WebAPI/Security/WebTelephony pref("dom.telephony.enabled", false); // https://developer.mozilla.org/en-US/docs/Web/API/navigator.sendBeacon pref("beacon.enabled", false); // https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/Preference_reference/dom.event.clipboardevents.enabled pref("dom.event.clipboardevents.enabled", false); // https://wiki.mozilla.org/Security/Reviews/Firefox/NavigationTimingAPI pref("dom.enable_performance", false); // https://wiki.mozilla.org/B2G/QA/WebAPI_Test_Plan/Vibration#API pref("dom.vibrator.enabled", false); // Speech recognition // https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html // https://wiki.mozilla.org/HTML5_Speech_API pref("media.webspeech.recognition.enable", false); pref("media.webspeech.synth.enabled", false); // Disable getUserMedia screen sharing // https://mozilla.github.io/webrtc-landing/gum_test.html pref("media.getusermedia.screensharing.enabled", false); // Disable sensor API // https://wiki.mozilla.org/Sensor_API pref("device.sensors.enabled", false); // Disable MMS pref("dom.mms.retrieval_mode", "never"); // http://kb.mozillazine.org/Browser.send_pings pref("browser.send_pings", false); // this shouldn't have any effect, since we block pings altogether, but we'll set it anyway. // http://kb.mozillazine.org/Browser.send_pings.require_same_host pref("browser.send_pings.require_same_host", true); // https://developer.mozilla.org/en-US/docs/IndexedDB // https://wiki.mozilla.org/Security/Reviews/Firefox4/IndexedDB_Security_Review // TODO: find out why html5test still reports this as available // Note: Disabled, Can be enable if it breaks plugins/sites which require it. Privacy Risk. // see: http://forums.mozillazine.org/viewtopic.php?p=13842047#p13842047 pref("dom.indexedDB.enabled", false); // TODO: "Access Your Location" "Maintain Offline Storage" "Show Notifications" // Disable gamepad input // http://www.w3.org/TR/gamepad/ pref("dom.gamepad.enabled", false); // Disable virtual reality devices // https://developer.mozilla.org/en-US/Firefox/Releases/36#Interfaces.2FAPIs.2FDOM pref("dom.vr.enabled", false); pref("dom.vr.cardboard.enabled", false); pref("dom.vr.oculus.enabled", false); pref("dom.vr.oculus050.enabled", false); pref("dom.vr.poseprediction.enabled", false); pref("dom.vr.add-test-devices", 0); // disable notifications pref("dom.webnotifications.enabled", false); // HTML5 privacy https://bugzilla.mozilla.org/show_bug.cgi?id=500328 pref("browser.history.allowPopState", false); pref("browser.history.allowPushState", false); pref("browser.history.allowReplaceState", false); // Idle Observation pref("dom.idle-observers-api.enabled", false); // Prevent Timing Attacks // https://network23.org/inputisevil/2015/09/06/how-html5-apis-can-fingerprint-users/ pref("dom.performance.enable_user_timing_logging", false); pref("dom.enable_resource_timing", false); // Bug 13024 pref("dom.enable_user_timing", false); // Bug 16336 pref("dom.event.highrestimestamp.enabled", true); // Bug 17046: Don't leak system uptime in Events // disable webGL // http://www.contextis.com/resources/blog/webgl-new-dimension-browser-exploitation/ pref("webgl.disabled", true); // https://bugzilla.mozilla.org/show_bug.cgi?id=1171228 // https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_debug_renderer_info pref("webgl.enable-debug-renderer-info", false); pref("webgl.disable-extensions", false); pref("webgl.min_capability_mode", true); // somewhat related... pref("pdfjs.enableWebGL", false); /****************************************************************************** * Misc * * * ******************************************************************************/ // Disable website autorefresh, user can still proceed with warning pref("accessibility.blockautorefresh", true); pref("browser.meta_refresh_when_inactive.disabled", true); pref("noscript.forbidMetaRefresh", true); // Disable face detection by default pref("camera.control.face_detection.enabled", false); pref("camera.control.autofocus_moving_callback.enabled", false); // Default search engine //pref("browser.search.defaultenginename", "DuckDuckGo"); // http://kb.mozillazine.org/Clipboard.autocopy //pref("clipboard.autocopy", false); // Display an error message indicating the entered information is not a valid // URL instead of asking from google. // http://kb.mozillazine.org/Keyword.enabled#Caveats pref("keyword.enabled", false); // Don't trim HTTP off of URLs in the address bar. // https://bugzilla.mozilla.org/show_bug.cgi?id=665580 pref("browser.urlbar.trimURLs", false); // Don't try to guess where i'm trying to go!!! e.g.: "http://foo" -> "http://(prefix)foo(suffix)" // http://www-archive.mozilla.org/docs/end-user/domain-guessing.html pref("browser.fixup.alternate.enabled", false); // Set TOR as default proxy pref("network.proxy.socks", "127.0.0.1"); pref("network.proxy.socks_port", 9050); // Proxy off by default, user can toggle it on. pref("network.proxy.type", 0); // Protect TOR ports pref("network.security.ports.banned", "9050,9051,9150,9151"); // https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers pref("network.proxy.socks_remote_dns", true); // For fingerprinting and local service vulns (#10419) pref("network.proxy.no_proxies_on", ""); // We not want to monitoring the connection state of users // https://trac.torproject.org/projects/tor/ticket/18945 pref("network.manage-offline-status", false); // Mixed content stuff // https://developer.mozilla.org/en-US/docs/Site_Compatibility_for_Firefox_23#Non-SSL_contents_on_SSL_pages_are_blocked_by_default // https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-blocking-enabled-in-firefox-23/ pref("security.mixed_content.block_active_content", true); // Mixed Passive Content (a.k.a. Mixed Display Content). pref("security.mixed_content.block_display_content", true); // https://secure.wikimedia.org/wikibooks/en/wiki/Grsecurity/Application-specific_Settings#Firefox_.28or_Iceweasel_in_Debian.29 pref("javascript.options.methodjit.chrome", false); pref("javascript.options.methodjit.content", false); // CIS Mozilla Firefox 24 ESR v1.0.0 - 3.7 Disable JAR from opening Unsafe File Types // http://kb.mozillazine.org/Network.jar.open-unsafe-types pref("network.jar.open-unsafe-types", false); // https://bugzilla.mozilla.org/show_bug.cgi?id=1173171 pref("network.jar.block-remote-files", true); // CIS 2.7.4 Disable Scripting of Plugins by JavaScript pref("security.xpconnect.plugin.unrestricted", false); // CIS Mozilla Firefox 24 ESR v1.0.0 - 3.8 Set File URI Origin Policy // http://kb.mozillazine.org/Security.fileuri.strict_origin_policy pref("security.fileuri.strict_origin_policy", true); // CIS 2.3.6 Disable Displaying Javascript in History URLs // http://kb.mozillazine.org/Browser.urlbar.filter.javascript pref("browser.urlbar.filter.javascript", true); // http://asmjs.org/ // https://www.mozilla.org/en-US/security/advisories/mfsa2015-29/ // https://www.mozilla.org/en-US/security/advisories/mfsa2015-50/ // https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2712 pref("javascript.options.asmjs", false); // https://hacks.mozilla.org/2016/03/a-webassembly-milestone/ pref("javascript.options.wasm", false); // https://trac.torproject.org/projects/tor/ticket/9387#comment:43 pref("javascript.options.typeinference", false); pref("javascript.options.baselinejit.content", false); pref("javascript.options.ion.content", false); // https://www.torproject.org/projects/torbrowser/design pref("mathml.disabled", true); // https://wiki.mozilla.org/SVGOpenTypeFonts // the iSEC Partners Report recommends to disable this pref("gfx.font_rendering.opentype_svg.enabled", false); // Disable SVG // Note: May only work in TBB due to upstream not implementing? // https://trac.torproject.org/projects/tor/ticket/18770 // https://bugzilla.mozilla.org/show_bug.cgi?id=1173199#c9 pref("svg.in-content.enabled", false); // https://bugzil.la/654550 // https://github.com/pyllyukko/user.js/issues/9#issuecomment-100468785 // https://github.com/pyllyukko/user.js/issues/9#issuecomment-148922065 pref("media.video_stats.enabled", false); // Don't reveal build ID // Value taken from Tor Browser // https://bugzil.la/583181 pref("general.buildID.override", "20100101"); // Prevent font fingerprinting // http://www.browserleaks.com/fonts // https://github.com/pyllyukko/user.js/issues/120 pref("browser.display.use_document_fonts", 0); // Prefer sans-serif pref("font.default.x-western", "sans-serif"); /****************************************************************************** * extensions / plugins * * * ******************************************************************************/ // Require signatures pref("xpinstall.signatures.required", true); // Opt-out of add-on metadata updates // https://blog.mozilla.org/addons/how-to-opt-out-of-add-on-metadata-updates/ pref("extensions.getAddons.cache.enabled", false); // Flash plugin state - never activate pref("plugin.state.flash", 0); pref("plugins.notifyMissingFlash", false); // Java plugin state - never activate pref("plugin.state.java", 0); // disable Gnome Shell Integration pref("plugin.state.libgnome-shell-browser-plugin", 0); // disable the bundled OpenH264 video codec // http://forums.mozillazine.org/viewtopic.php?p=13845077&sid=28af2622e8bd8497b9113851676846b1#p13845077 pref("media.gmp-provider.enabled", false); // https://wiki.mozilla.org/Firefox/Click_To_Play // https://blog.mozilla.org/security/2012/10/11/click-to-play-plugins-blocklist-style/ pref("plugins.click_to_play", true); // Updates addons automatically // Disabled due to Fingerprinting, you can update addons manually. // https://blog.mozilla.org/addons/how-to-turn-off-add-on-updates/ pref("extensions.update.enabled", false); pref("extensions.update.autoUpdateDefault", false); // User can still update manually, but we disable background updates. pref("extensions.update.background.url", ""); // The system add-ons infrastructure that's used to ship Hello and Pocket in Firefox pref("extensions.systemAddon.update.url", ""); // We can update our themes manually, may fingerprint the user. pref("lightweightThemes.update.enabled", false); // Only install extensions to user profile // https://developer.mozilla.org/en-US/Add-ons/Installing_extensions // https://mike.kaply.com/2012/02/21/understanding-add-on-scopes/ pref("extensions.enabledScopes", 1); // http://kb.mozillazine.org/Extensions.blocklist.enabled pref("extensions.blocklist.enabled", false); pref("extensions.blocklist.detailsURL", "about:blank"); pref("extensions.blocklist.itemURL", "about:blank"); pref("extensions.blocklist.url", "about:blank"); pref("extensions.getAddons.get.url", "about:blank"); pref("extensions.getAddons.getWithPerformance.url", "about:blank"); pref("extensions.getAddons.recommended.url", "about:blank"); pref("services.settings.server", ""); // If blocklist downloads, we want it to be signed. pref("services.blocklist.signing.enforced", true); // Disable Freedom Violating DRM Feature // https://bugzilla.mozilla.org/show_bug.cgi?id=1144903#c8 pref("media.eme.apiVisible", false); pref("media.eme.enabled", false); pref("browser.eme.ui.enabled", false); pref("media.gmp-eme-adobe.enabled", false); // Fingerprints the user, not HTTPS. Remove it. pref("pfs.datasource.url", "about:blank"); pref("pfs.filehint.url", "about:blank"); /****************************************************************************** * firefox features / components * * * ******************************************************************************/ // WebIDE // https://trac.torproject.org/projects/tor/ticket/16222 pref("devtools.webide.enabled", false); pref("devtools.webide.autoinstallADBHelper", false); pref("devtools.webide.autoinstallFxdtAdapters", false); // disable remote debugging // https://developer.mozilla.org/docs/Tools/Remote_Debugging/Debugging_Firefox_Desktop#Enable_remote_debugging // https://developer.mozilla.org/en-US/docs/Tools/Tools_Toolbox#Advanced_settings pref("devtools.debugger.remote-enabled", false); // "to use developer tools in the context of the browser itself, and not only web content" pref("devtools.chrome.enabled", false); // https://developer.mozilla.org/en-US/docs/Tools/Remote_Debugging/Debugging_Firefox_Desktop#Firefox_37_onwards pref("devtools.debugger.force-local", true); pref("devtools.devices.url", "about:blank"); pref("devtools.gcli.imgurUploadURL", "about:blank"); pref("devtools.gcli.jquerySrc", "about:blank"); pref("devtools.gcli.lodashSrc", "about:blank"); pref("devtools.gcli.underscoreSrc", "about:blank"); // http://forum.top-hat-sec.com/index.php?topic=4951.5;wap2 pref("devtools.remote.wifi.scan", false); pref("devtools.remote.wifi.visible", false); pref("devtools.webide.adaptersAddonURL", "about:blank"); pref("devtools.webide.adbAddonURL", "about:blank"); pref("devtools.webide.addonsURL", "about:blank"); //https://trac.torproject.org/projects/tor/ticket/16222 pref("devtools.webide.enabled", false); pref("devtools.webide.simulatorAddonsURL", "about:blank"); pref("devtools.webide.templatesURL", "about:blank"); // https://wiki.mozilla.org/Platform/Features/Telemetry // https://www.mozilla.org/en-US/legal/privacy/firefox.html#telemetry // https://wiki.mozilla.org/Security/Reviews/Firefox6/ReviewNotes/telemetry pref("toolkit.telemetry.enabled", false); // https://gecko.readthedocs.org/en/latest/toolkit/components/telemetry/telemetry/preferences.html pref("toolkit.telemetry.unified", false); pref("toolkit.telemetry.server", "about:blank"); pref("toolkit.telemetry.archive.enabled", false); // https://wiki.mozilla.org/Telemetry/Experiments pref("experiments.supported", false); pref("experiments.enabled", false); pref("experiments.manifest.uri", false); // https://trac.torproject.org/projects/tor/ticket/13170 pref("network.allow-experiments", false); // Disable the UITour backend so there is no chance that a remote page // can use it to confuse Tor Browser users. pref("browser.uitour.enabled", false); // https://wiki.mozilla.org/Security/Tracking_protection // https://support.mozilla.org/en-US/kb/tracking-protection-firefox pref("privacy.trackingprotection.enabled", true); // https://support.mozilla.org/en-US/kb/tracking-protection-pbm pref("privacy.trackingprotection.pbmode.enabled", true); // Third Party Isolation Enabled Always // https://github.com/arthuredelstein/tor-browser/commit/b8da7721a9df4af1b595eb046e94280fe8e32d31 pref("privacy.thirdparty.isolate", 2); // Resist fingerprinting via window.screen and CSS media queries and other techniques // https://bugzil.la/418986 // https://bugzil.la/1281949 // https://bugzil.la/1281963 pref("privacy.resistFingerprinting", true); // Disable the built-in PDF viewer (CVE-2015-2743) // https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2743 pref("pdfjs.disabled", true); // Disable sending of the health report // https://support.mozilla.org/en-US/kb/firefox-health-report-understand-your-browser-perf pref("datareporting.healthreport.uploadEnabled", false); // disable collection of the data (the healthreport.sqlite* files) pref("datareporting.healthreport.service.enabled", false); // https://gecko.readthedocs.org/en/latest/toolkit/components/telemetry/telemetry/preferences.html pref("datareporting.policy.dataSubmissionEnabled", false); pref("datareporting.healthreport.about.reportUrl", "about:blank"); pref("datareporting.healthreport.documentServerURI", "about:blank"); pref("datareporting.policy.firstRunTime", 0); // Disable new tab tile ads & preload // http://www.thewindowsclub.com/disable-remove-ad-tiles-from-firefox // http://forums.mozillazine.org/viewtopic.php?p=13876331#p13876331 pref("browser.newtabpage.enhanced", false); pref("browser.newtab.preload", false); pref("browser.newtabpage.introShown", true); // https://wiki.mozilla.org/Tiles/Technical_Documentation#Ping // https://gecko.readthedocs.org/en/latest/browser/browser/DirectoryLinksProvider.html#browser-newtabpage-directory-ping pref("browser.newtabpage.directory.ping", ""); // https://gecko.readthedocs.org/en/latest/browser/browser/DirectoryLinksProvider.html#browser-newtabpage-directory-source pref("browser.newtabpage.directory.source", "data:text/plain,{}"); // disable heartbeat // https://wiki.mozilla.org/Advocacy/heartbeat pref("browser.selfsupport.url", ""); // Disable firefox hello // https://wiki.mozilla.org/Loop //pref("loop.enabled", false); // https://groups.google.com/d/topic/mozilla.dev.platform/nyVkCx-_sFw/discussion pref("loop.logDomains", false); // Disable Crash Reporter (Massive browser fingerprinting) pref("dom.ipc.plugins.flash.subprocess.crashreporter.enabled", false); pref("browser.tabs.crashReporting.sendReport", false); pref("breakpad.reportURL", "about:blank"); // Disable Slow Startup Notifications pref("browser.slowStartup.maxSamples", 0); pref("browser.slowStartup.notificationDisabled", true); pref("browser.slowStartup.samples", 0); // CIS 2.1.1 Disable Auto Update / Balrog pref("app.update.auto", false); pref("app.update.checkInstallTime", false); pref("app.update.enabled", false); pref("app.update.staging.enabled", false); pref("app.update.url", "about:blank"); pref("media.gmp-manager.certs.1.commonName", ""); pref("media.gmp-manager.certs.2.commonName", ""); // CIS 2.3.4 Block Reported Web Forgeries // http://kb.mozillazine.org/Browser.safebrowsing.enabled // http://kb.mozillazine.org/Safe_browsing // https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work // http://forums.mozillazine.org/viewtopic.php?f=39&t=2711237&p=12896849#p12896849 pref("browser.safebrowsing.enabled", false); // CIS 2.3.5 Block Reported Attack Sites // http://kb.mozillazine.org/Browser.safebrowsing.malware.enabled pref("browser.safebrowsing.malware.enabled", false); // Disable safe browsing remote lookups for downloaded files. // This leaks information to google. // https://www.mozilla.org/en-US/firefox/39.0/releasenotes/ // https://wiki.mozilla.org/Security/Application_Reputation pref("browser.safebrowsing.downloads.remote.enabled", false); pref("browser.safebrowsing.appRepURL", "about:blank"); pref("browser.safebrowsing.provider.mozilla.gethashURL", "about:blank"); pref("browser.safebrowsing.provider.mozilla.updateURL", "about:blank"); pref("browser.safebrowsing.downloads.remote.block_dangerous", false); pref("browser.safebrowsing.downloads.remote.block_dangerous_host", false); pref("browser.safebrowsing.downloads.remote.block_potentially_unwanted", false); pref("browser.safebrowsing.downloads.remote.block_uncommon", false); pref("browser.safebrowsing.downloads.remote.enabled", false); pref("browser.safebrowsing.downloads.remote.url", ""); pref("browser.safebrowsing.provider.google.gethashURL", ""); pref("browser.safebrowsing.provider.google.updateURL", ""); pref("browser.safebrowsing.provider.google.lists", ""); // Disable pocket // https://support.mozilla.org/en-US/kb/save-web-pages-later-pocket-firefox pref("browser.pocket.enabled", false); // https://github.com/pyllyukko/user.js/issues/143 pref("extensions.pocket.enabled", false); pref("extensions.pocket.api", "about:blank"); pref("extensions.pocket.enabled", false); pref("browser.pocket.api", "about:blank"); pref("browser.pocket.enabledLocales", "about:blank"); pref("browser.pocket.oAuthConsumerKey", "about:blank"); pref("browser.pocket.site", "about:blank"); pref("browser.pocket.useLocaleList", false); pref("browser.toolbarbuttons.introduced.pocket-button", true); // Disable Hello (Soon to be removed upstream finally!) pref("loop.copy.throttler", "about:blank"); pref("loop.enabled",false); pref("loop.facebook.appId", "about:blank"); pref("loop.facebook.enabled", false); pref("loop.facebook.fallbackUrl", "about:blank"); pref("loop.facebook.shareUrl", "about:blank"); pref("loop.feedback.baseUrl", "about:blank"); pref("loop.feedback.formURL", "about:blank"); pref("loop.feedback.manualFormURL", "about:blank"); pref("loop.gettingStarted.url", "about:blank"); pref("loop.learnMoreUrl", "about:blank"); pref("loop.legal.ToS_url", "about:blank"); pref("loop.legal.privacy_url", "about:blank"); pref("loop.linkClicker.url", "about:blank"); pref("loop.oauth.google.redirect_uri", "about:blank"); pref("loop.oauth.google.scope", "about:blank"); pref("loop.remote.autostart", false); pref("loop.server", "about:blank"); pref("loop.soft_start_hostname", "about:blank"); pref("loop.support_url", "about:blank"); pref("loop.throttled2", false); // Disable Social pref("social.directories", ""); pref("social.enabled", false); // remote-install allows any website to activate a provider, with extended UI pref("social.remote-install.enabled", false); pref("social.shareDirectory", ""); pref("social.toast-notifications.enabled", false); pref("social.whitelist", ""); // Disable Snippets pref("browser.snippets.enabled", false); pref("browser.snippets.geoUrl", "about:blank"); pref("browser.snippets.statsUrl", "about:blank"); pref("browser.snippets.syncPromo.enabled", false); pref("browser.snippets.updateUrl", "about:blank"); // Disable WAN IP leaks pref("captivedetect.canonicalURL", "about:blank"); pref("noscript.ABE.wanIpAsLocal", false); // Disable Default Protocol Handlers, always warn user instead pref("network.protocol-handler.external-default", false); pref("network.protocol-handler.external.mailto", false); pref("network.protocol-handler.external.news", false); pref("network.protocol-handler.external.nntp", false); pref("network.protocol-handler.external.snews", false); pref("network.protocol-handler.warn-external.mailto", true); pref("network.protocol-handler.warn-external.news", true); pref("network.protocol-handler.warn-external.nntp", true); pref("network.protocol-handler.warn-external.snews", true); // Disable Sync pref("services.sync.engine.addons", false); // Never sync prefs, addons, or tabs with other browsers pref("services.sync.engine.prefs", false); pref("services.sync.engine.tabs", false); pref("services.sync.prefs.sync.addons.ignoreUserEnabledChanges", false); pref("services.sync.prefs.sync.extensions.update.enabled", false); pref("services.sync.serverURL", "about:blank"); pref("services.sync.jpake.serverURL", "about:blank"); // Disable Failed Sync Logs since we killed sync. pref("services.sync.log.appender.file.logOnError", false); /****************************************************************************** * automatic connections * * * ******************************************************************************/ // Disable link prefetching // http://kb.mozillazine.org/Network.prefetch-next // https://developer.mozilla.org/en-US/docs/Web/HTTP/Link_prefetching_FAQ#Is_there_a_preference_to_disable_link_prefetching.3F pref("network.prefetch-next", false); // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_geolocation-for-default-search-engine pref("browser.search.geoip.url", ""); pref("browser.search.geoSpecificDefaults.url", "about:blank"); pref("browser.search.geoSpecificDefaults", false); pref("browser.search.geoip.url", "about:blank"); // http://kb.mozillazine.org/Network.dns.disablePrefetch // https://developer.mozilla.org/en-US/docs/Web/HTTP/Controlling_DNS_prefetching pref("network.dns.disablePrefetch", true); pref("network.dns.disablePrefetchFromHTTPS", true); // https://bugzilla.mozilla.org/show_bug.cgi?id=1228457 pref("network.dns.blockDotOnion", true); // https://wiki.mozilla.org/Privacy/Reviews/Necko pref("network.predictor.enabled", false); // https://wiki.mozilla.org/Privacy/Reviews/Necko#Principle:_Real_Choice pref("network.seer.enabled", false); // http://kb.mozillazine.org/Browser.search.suggest.enabled pref("browser.search.suggest.enabled", false); // Disable "Show search suggestions in location bar results" pref("browser.urlbar.suggest.searches", false); // Disable SSDP // https://bugzil.la/1111967 pref("browser.casting.enabled", false); // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_media-capabilities // http://andreasgal.com/2014/10/14/openh264-now-in-firefox/ pref("media.gmp-gmpopenh264.enabled", false); // Disable Gecko media plugins: https://wiki.mozilla.org/GeckoMediaPlugins pref("media.gmp-manager.url", ""); pref("media.gmp-manager.url.override", "data:text/plain"); pref("media.gmp.trial-create.enabled", false); // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_speculative-pre-connections // https://bugzil.la/814169 pref("network.http.speculative-parallel-limit", 0); // https://github.com/arthuredelstein/tor-browser/blob/tbb-esr31.1.1/browser/app/profile/000-tor-browser.js pref("network.http.pipelining", true); pref("network.http.pipelining.aggressive", true); pref("network.http.pipelining.maxrequests", 12); pref("network.http.pipelining.ssl", true); pref("network.http.proxy.pipelining", true); pref("security.ssl.enable_false_start", true); pref("network.http.keep-alive.timeout", 20); pref("network.http.connection-retry-timeout", 0); pref("network.http.max-persistent-connections-per-proxy", 256); pref("network.http.pipelining.reschedule-timeout", 15000); pref("network.http.pipelining.read-timeout", 60000); pref("network.http.pipelining.max-optimistic-requests", 3); pref("network.http.spdy.enabled", false); // Stores state and may have keepalive issues (both fixable) pref("network.http.spdy.enabled.v2", false); // Seems redundant, but just in case pref("network.http.spdy.enabled.v3", false); // Seems redundant, but just in case // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_mozilla-content pref("browser.aboutHomeSnippets.updateUrl", ""); // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_auto-update-checking pref("browser.search.update", false); //Disable Link to FireFox Marketplace, currently loaded with non-free "apps" pref("browser.apps.URL", ""); pref("browser.webapps.checkForUpdates", 0); pref("browser.webapps.updateCheckUrl", "about:blank"); pref("dom.mozApps.signed_apps_installable_from", ""); // Disable Favicon lookups // http://kb.mozillazine.org/Browser.chrome.favicons // pref("browser.chrome.favicons", false); // pref("browser.chrome.site_icons", false); /****************************************************************************** * HTTP * * * ******************************************************************************/ // Disallow NTLMv1 // https://bugzilla.mozilla.org/show_bug.cgi?id=828183 pref("network.negotiate-auth.allow-insecure-ntlm-v1", false); // it is still allowed through HTTPS. uncomment the following to disable it completely. //pref("network.negotiate-auth.allow-insecure-ntlm-v1-https", false); // https://bugzilla.mozilla.org/show_bug.cgi?id=855326 pref("security.csp.experimentalEnabled", true); // CSP https://developer.mozilla.org/en-US/docs/Web/Security/CSP/Introducing_Content_Security_Policy pref("security.csp.enable", true); // Subresource integrity // https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity // https://wiki.mozilla.org/Security/Subresource_Integrity pref("security.sri.enable", true); // DNT HTTP header // http://dnt.mozilla.org/ // https://en.wikipedia.org/wiki/Do_not_track_header // https://dnt-dashboard.mozilla.org // https://github.com/pyllyukko/user.js/issues/11 // http://www.howtogeek.com/126705/why-enabling-do-not-track-doesnt-stop-you-from-being-tracked/ //pref("privacy.donottrackheader.enabled", true); // Disable HTTP Alternative Services header // https://trac.torproject.org/projects/tor/ticket/16673 pref("network.http.altsvc.enabled", false); pref("network.http.altsvc.oe", false); // http://kb.mozillazine.org/Network.http.sendRefererHeader#0 // https://bugzilla.mozilla.org/show_bug.cgi?id=822869 // Send a referer header with the target URI as the source //pref("network.http.sendRefererHeader", 1); pref("network.http.referer.spoofSource", true); // CIS 2.5.1 Accept Only 1st Party Cookies // http://kb.mozillazine.org/Network.cookie.cookieBehavior#1 // This breaks a number of payment gateways so you may need to comment it out. pref("network.cookie.cookieBehavior", 1); // Make sure that third-party cookies (if enabled) never persist beyond the session. // https://feeding.cloud.geek.nz/posts/tweaking-cookies-for-privacy-in-firefox/ // http://kb.mozillazine.org/Network.cookie.thirdparty.sessionOnly // https://developer.mozilla.org/en-US/docs/Cookies_Preferences_in_Mozilla#network.cookie.thirdparty.sessionOnly pref("network.cookie.thirdparty.sessionOnly", true); // user-agent //pref("general.useragent.override", "Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Firefox/31.0"); /****************************************************************************** * Caching * * * ******************************************************************************/ // Prevents the Permissions manager from writing to disk (regardless of whether we are in PBM) // https://bugzilla.mozilla.org/show_bug.cgi?id=967812#c9 pref("permissions.memory_only", true); // Ensures the intermediate certificate store is memory only. // Note: Conflicts with old HTTP Basic Authentication // https://bugzilla.mozilla.org/show_bug.cgi?id=1216882#c0 pref("security.nocertdb", true); // http://kb.mozillazine.org/Browser.sessionstore.postdata // NOTE: relates to CIS 2.5.7 pref("browser.sessionstore.postdata", 0); // http://kb.mozillazine.org/Browser.sessionstore.enabled pref("browser.sessionstore.enabled", false); // http://kb.mozillazine.org/Browser.cache.offline.enable pref("browser.cache.offline.enable", false); // Always use private browsing // https://support.mozilla.org/en-US/kb/Private-Browsing // https://wiki.mozilla.org/PrivateBrowsing // pref("browser.privatebrowsing.autostart", true); pref("extensions.ghostery.privateBrowsing", true); // Clear history when Firefox closes // https://support.mozilla.org/en-US/kb/Clear%20Recent%20History#w_how-do-i-make-firefox-clear-my-history-automatically pref("privacy.sanitize.sanitizeOnShutdown", true); pref("privacy.clearOnShutdown.cache", true); pref("privacy.clearOnShutdown.cookies", true); pref("privacy.clearOnShutdown.downloads", true); pref("privacy.clearOnShutdown.formdata", true); pref("privacy.clearOnShutdown.history", true); pref("privacy.clearOnShutdown.offlineApps", true); pref("privacy.clearOnShutdown.passwords", true); pref("privacy.clearOnShutdown.sessions", true); //pref("privacy.clearOnShutdown.siteSettings", false); // Firefox will store small amounts (less than 50 MB) of data without asking for permission, unless this is set to false // https://support.mozilla.org/en-US/questions/1014708 pref("offline-apps.allow_by_default", false); // don't remember browsing history pref("places.history.enabled", false); // The cookie expires at the end of the session (when the browser closes). // http://kb.mozillazine.org/Network.cookie.lifetimePolicy#2 pref("network.cookie.lifetimePolicy", 2); // http://kb.mozillazine.org/Browser.cache.disk.enable pref("browser.cache.disk.enable", false); // http://kb.mozillazine.org/Browser.cache.memory.enable //pref("browser.cache.memory.enable", false); // CIS Version 1.2.0 October 21st, 2011 2.5.8 Disable Caching of SSL Pages // http://kb.mozillazine.org/Browser.cache.disk_cache_ssl pref("browser.cache.disk_cache_ssl", false); // CIS Version 1.2.0 October 21st, 2011 2.5.2 Disallow Credential Storage pref("signon.rememberSignons", false); // CIS Version 1.2.0 October 21st, 2011 2.5.5 Delete Download History // Zero (0) is an indication that no download history is retained for the current profile. pref("browser.download.manager.retention", 0); // CIS Version 1.2.0 October 21st, 2011 2.5.6 Delete Search and Form History pref("browser.formfill.enable", false); pref("browser.formfill.expire_days", 0); // CIS Version 1.2.0 October 21st, 2011 2.5.7 Clear SSL Form Session Data // http://kb.mozillazine.org/Browser.sessionstore.privacy_level#2 // Store extra session data for unencrypted (non-HTTPS) sites only. // NOTE: CIS says 1, we use 2 pref("browser.sessionstore.privacy_level", 2); // https://bugzil.la/238789#c19 pref("browser.helperApps.deleteTempFileOnExit", true); // Disable the media cache, prvents HTML5 videos from being written to the OS temporary directory // https://www.torproject.org/projects/torbrowser/design/ pref("media.cache_size", 0); // https://support.mozilla.org/en-US/questions/973320 // https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/Preference_reference/browser.pagethumbnails.capturing_disabled pref("browser.pagethumbnails.capturing_disabled", true); /****************************************************************************** * UI related * * * ******************************************************************************/ // Webpages will not be able to affect the right-click menu //pref("dom.event.contextmenu.enabled", false); // Don't promote sync pref("browser.syncPromoViewsLeftMap", "{\"addons\":0, \"passwords\":0, \"bookmarks\":0}"); // CIS 2.3.2 Disable Downloading on Desktop pref("browser.download.folderList", 2); // always ask the user where to download // https://developer.mozilla.org/en/Download_Manager_preferences pref("browser.download.useDownloadDir", false); // https://wiki.mozilla.org/Privacy/Reviews/New_Tab pref("browser.newtabpage.enabled", false); // https://support.mozilla.org/en-US/kb/new-tab-page-show-hide-and-customize-top-sites#w_how-do-i-turn-the-new-tab-page-off pref("browser.newtab.url", "about:blank"); // CIS Version 1.2.0 October 21st, 2011 2.1.2 Enable Auto Notification of Outdated Plugins // https://wiki.mozilla.org/Firefox3.6/Plugin_Update_Awareness_Security_Review // Note: Disabled, we get plugin updates from repository. //pref("plugins.update.notifyUser", true); // CIS Version 1.2.0 October 21st, 2011 2.1.3 Enable Information Bar for Outdated Plugins pref("plugins.hide_infobar_for_outdated_plugin", false); // CIS Mozilla Firefox 24 ESR v1.0.0 - 3.6 Enable IDN Show Punycode // http://kb.mozillazine.org/Network.IDN_show_punycode pref("network.IDN_show_punycode", true); // http://kb.mozillazine.org/About:config_entries#Browser // http://kb.mozillazine.org/Inline_autocomplete pref("browser.urlbar.autoFill", false); pref("browser.urlbar.autoFill.typed", false); // http://www.labnol.org/software/browsers/prevent-firefox-showing-bookmarks-address-location-bar/3636/ // http://kb.mozillazine.org/Browser.urlbar.maxRichResults // "Setting the preference to 0 effectively disables the Location Bar dropdown entirely." pref("browser.urlbar.maxRichResults", 0); // https://blog.mozilla.org/security/2010/03/31/plugging-the-css-history-leak/ // http://dbaron.org/mozilla/visited-privacy pref("layout.css.visited_links_enabled", false); // http://kb.mozillazine.org/Places.frecency.unvisited%28place_type%29Bonus // http://kb.mozillazine.org/Disabling_autocomplete_-_Firefox#Firefox_3.5 pref("browser.urlbar.autocomplete.enabled", false); // http://kb.mozillazine.org/Signon.autofillForms // https://www.torproject.org/projects/torbrowser/design/#identifier-linkability pref("signon.autofillForms", false); // do not check if firefox is the default browser pref("browser.shell.checkDefaultBrowser", false); // CIS Version 1.2.0 October 21st, 2011 2.5.3 Disable Prompting for Credential Storage pref("security.ask_for_password", 0); // Bug 9881: Open popups in new tabs (to avoid fullscreen popups) pref("browser.link.open_newwindow.restriction", 0); // Enable Insecure login field contextual warning // https://bugzilla.mozilla.org/show_bug.cgi?id=1217162 pref("security.insecure_field_warning.contextual.enabled", true); /****************************************************************************** * TLS / HTTPS / OCSP related stuff * * * ******************************************************************************/ // https://blog.mozilla.org/security/2012/11/01/preloading-hsts/ // https://wiki.mozilla.org/Privacy/Features/HSTS_Preload_List pref("network.stricttransportsecurity.preloadlist", false); // CIS Version 1.2.0 October 21st, 2011 2.2.4 Enable Online Certificate Status Protocol // https://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol#Privacy_concerns pref("security.OCSP.enabled", 0); pref("security.OCSP.require", false); // https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/ pref("security.ssl.enable_ocsp_stapling", true); // require certificate revocation check through OCSP protocol. // NOTICE: this leaks information about the sites you visit to the CA. pref("security.OCSP.require", true); // https://www.blackhat.com/us-13/briefings.html#NextGen // https://media.blackhat.com/us-13/US-13-Daigniere-TLS-Secrets-Slides.pdf // https://media.blackhat.com/us-13/US-13-Daigniere-TLS-Secrets-WP.pdf // https://bugzil.la/917049 // https://bugzil.la/967977 pref("security.ssl.disable_session_identifiers", true); // https://www.torproject.org/projects/torbrowser/design/index.html.en pref("security.ssl.enable_false_start", true); pref("security.enable_tls_session_tickets", false); // TLS 1.[012] // http://kb.mozillazine.org/Security.tls.version.max // 1 = TLS 1.0 is the minimum required / maximum supported encryption protocol. (This is the current default for the maximum supported version.) // 2 = TLS 1.1 is the minimum required / maximum supported encryption protocol. pref("security.tls.version.min", 1); pref("security.tls.version.max", 3); // pinning // https://wiki.mozilla.org/SecurityEngineering/Public_Key_Pinning#How_to_use_pinning // "2. Strict. Pinning is always enforced." pref("security.cert_pinning.enforcement_level", 2); // disallow SHA-1 // https://bugzilla.mozilla.org/show_bug.cgi?id=1302140 //pref("security.pki.sha1_enforcement_level", 1); // https://wiki.mozilla.org/Security:Renegotiation#security.ssl.treat_unsafe_negotiation_as_broken // see also CVE-2009-3555 pref("security.ssl.treat_unsafe_negotiation_as_broken", true); // https://wiki.mozilla.org/Security:Renegotiation#security.ssl.require_safe_negotiation // this makes browsing next to impossible=) (13.2.2012) // update: the world is not ready for this! (6.5.2014) // see also CVE-2009-3555 // The world must comply with this! (11.20.2016) pref("security.ssl.require_safe_negotiation", true); // https://support.mozilla.org/en-US/kb/certificate-pinning-reports // // we could also disable security.ssl.errorReporting.enabled, but I think it's // good to leave the option to report potentially malicious sites if the user // chooses to do so. // // you can test this at https://pinningtest.appspot.com/ pref("security.ssl.errorReporting.automatic", false); // http://kb.mozillazine.org/Browser.ssl_override_behavior // Pre-populate the current URL but do not pre-fetch the certificate. pref("browser.ssl_override_behavior", 1); /****************************************************************************** * CIPHERS * * * * you can debug the SSL handshake with tshark: * * tshark -t ad -n -i wlan0 -T text -V -R ssl.handshake * ******************************************************************************/ // disable null ciphers pref("security.ssl3.rsa_null_sha", false); pref("security.ssl3.rsa_null_md5", false); pref("security.ssl3.ecdhe_rsa_null_sha", false); pref("security.ssl3.ecdhe_ecdsa_null_sha", false); pref("security.ssl3.ecdh_rsa_null_sha", false); pref("security.ssl3.ecdh_ecdsa_null_sha", false); // SEED // https://en.wikipedia.org/wiki/SEED pref("security.ssl3.rsa_seed_sha", false); // 40 bits... pref("security.ssl3.rsa_rc4_40_md5", false); pref("security.ssl3.rsa_rc2_40_md5", false); // 56 bits pref("security.ssl3.rsa_1024_rc4_56_sha", false); // 128 bits pref("security.ssl3.rsa_camellia_128_sha", false); pref("security.ssl3.ecdhe_rsa_aes_128_sha", false); pref("security.ssl3.ecdhe_ecdsa_aes_128_sha", false); pref("security.ssl3.ecdh_rsa_aes_128_sha", false); pref("security.ssl3.ecdh_ecdsa_aes_128_sha", false); pref("security.ssl3.dhe_rsa_camellia_128_sha", false); pref("security.ssl3.dhe_rsa_aes_128_sha", false); // RC4 (CVE-2013-2566) pref("security.ssl3.ecdh_ecdsa_rc4_128_sha", false); pref("security.ssl3.ecdh_rsa_rc4_128_sha", false); pref("security.ssl3.ecdhe_ecdsa_rc4_128_sha", false); pref("security.ssl3.ecdhe_rsa_rc4_128_sha", false); pref("security.ssl3.rsa_rc4_128_md5", false); pref("security.ssl3.rsa_rc4_128_sha", false); // https://developer.mozilla.org/en-US/Firefox/Releases/38#Security // https://bugzil.la/1138882 // https://rc4.io/ pref("security.tls.unrestricted_rc4_fallback", false); // 3DES -> false because effective key size < 128 // https://en.wikipedia.org/wiki/3des#Security // http://en.citizendium.org/wiki/Meet-in-the-middle_attack // http://www-archive.mozilla.org/projects/security/pki/nss/ssl/fips-ssl-ciphersuites.html pref("security.ssl3.dhe_dss_des_ede3_sha", false); pref("security.ssl3.dhe_rsa_des_ede3_sha", false); pref("security.ssl3.ecdh_ecdsa_des_ede3_sha", false); pref("security.ssl3.ecdh_rsa_des_ede3_sha", false); pref("security.ssl3.ecdhe_ecdsa_des_ede3_sha", false); pref("security.ssl3.ecdhe_rsa_des_ede3_sha", false); pref("security.ssl3.rsa_des_ede3_sha", false); pref("security.ssl3.rsa_fips_des_ede3_sha", false); // Ciphers with ECDH (without /e$/) pref("security.ssl3.ecdh_rsa_aes_256_sha", false); pref("security.ssl3.ecdh_ecdsa_aes_256_sha", false); // 256 bits without PFS pref("security.ssl3.rsa_camellia_256_sha", false); // Ciphers with ECDHE and > 128bits pref("security.ssl3.ecdhe_rsa_aes_256_sha", true); pref("security.ssl3.ecdhe_ecdsa_aes_256_sha", true); // GCM, yes please! pref("security.ssl3.ecdhe_ecdsa_aes_128_gcm_sha256", true); pref("security.ssl3.ecdhe_rsa_aes_128_gcm_sha256", true); // ChaCha20 and Poly1305. Supported since Firefox 47. // https://www.mozilla.org/en-US/firefox/47.0/releasenotes/ // https://tools.ietf.org/html/rfc7905 // https://bugzil.la/917571 // https://bugzil.la/1247860 // https://cr.yp.to/chacha.html pref("security.ssl3.ecdhe_ecdsa_chacha20_poly1305_sha256", true); pref("security.ssl3.ecdhe_rsa_chacha20_poly1305_sha256", true); // Susceptible to the logjam attack - https://weakdh.org/ pref("security.ssl3.dhe_rsa_camellia_256_sha", false); pref("security.ssl3.dhe_rsa_aes_256_sha", false); // Ciphers with DSA (max 1024 bits) pref("security.ssl3.dhe_dss_aes_128_sha", false); pref("security.ssl3.dhe_dss_aes_256_sha", false); pref("security.ssl3.dhe_dss_camellia_128_sha", false); pref("security.ssl3.dhe_dss_camellia_256_sha", false); // Fallbacks due compatibility reasons pref("security.ssl3.rsa_aes_256_sha", true); pref("security.ssl3.rsa_aes_128_sha", true); // Disable static TLS insecure fallback whitelist // https://bugzilla.mozilla.org/show_bug.cgi?id=1128227 pref("security.tls.insecure_fallback_hosts.use_static_list", false);