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1 //
2 /******************************************************************************
3  * user.js                                                                    *
4  * https://github.com/pyllyukko/user.js                                       *
5  ******************************************************************************/
6
7 /******************************************************************************
8  * SECTION: HTML5 / APIs / DOM                                                *
9  ******************************************************************************/
10
11 // PREF: Disable Service Workers
12 // https://developer.mozilla.org/en-US/docs/Web/API/Worker
13 // https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker_API
14 // https://wiki.mozilla.org/Firefox/Push_Notifications#Service_Workers
15 // NOTICE: Disabling ServiceWorkers breaks functionality on some sites (Google Street View...)
16 // Unknown security implications
17 // CVE-2016-5259, CVE-2016-2812, CVE-2016-1949, CVE-2016-5287 (fixed)
18 user_pref("dom.serviceWorkers.enabled",                         false);
19
20 // PREF: Disable web notifications
21 // https://support.mozilla.org/en-US/questions/1140439
22 user_pref("dom.webnotifications.enabled",                       false);
23
24 // PREF: Disable DOM timing API
25 // https://wiki.mozilla.org/Security/Reviews/Firefox/NavigationTimingAPI
26 // https://www.w3.org/TR/navigation-timing/#privacy
27 user_pref("dom.enable_performance",                             false);
28
29 // PREF: Make sure the User Timing API does not provide a new high resolution timestamp
30 // https://trac.torproject.org/projects/tor/ticket/16336
31 // https://www.w3.org/TR/2013/REC-user-timing-20131212/#privacy-security
32 user_pref("dom.enable_user_timing",                             false);
33
34 // PREF: Disable Web Audio API
35 // https://bugzilla.mozilla.org/show_bug.cgi?id=1288359
36 // NOTICE: Web Audio API is required for Unity web player/games
37 user_pref("dom.webaudio.enabled",                               false);
38
39 // PREF: Disable Location-Aware Browsing (geolocation)
40 // https://www.mozilla.org/en-US/firefox/geolocation/
41 user_pref("geo.enabled",                                        false);
42
43 // PREF: When geolocation is enabled, use Mozilla geolocation service instead of Google
44 // https://bugzilla.mozilla.org/show_bug.cgi?id=689252
45 user_pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
46
47 // PREF: When geolocation is enabled, don't log geolocation requests to the console
48 user_pref("geo.wifi.logging.enabled", false);
49
50 // PREF: Disable raw TCP socket support (mozTCPSocket)
51 // https://trac.torproject.org/projects/tor/ticket/18863
52 // https://www.mozilla.org/en-US/security/advisories/mfsa2015-97/
53 // https://developer.mozilla.org/docs/Mozilla/B2G_OS/API/TCPSocket
54 user_pref("dom.mozTCPSocket.enabled",                           false);
55
56 // PREF: Disable DOM storage (disabled)
57 // http://kb.mozillazine.org/Dom.storage.enabled
58 // https://html.spec.whatwg.org/multipage/webstorage.html
59 // NOTICE-DISABLED: Disabling DOM storage is known to cause`TypeError: localStorage is null` errors
60 //user_pref("dom.storage.enabled",              false);
61
62 // PREF: Disable leaking network/browser connection information via Javascript
63 // Network Information API provides general information about the system's connection type (WiFi, cellular, etc.)
64 // https://developer.mozilla.org/en-US/docs/Web/API/Network_Information_API
65 // https://wicg.github.io/netinfo/#privacy-considerations
66 // https://bugzilla.mozilla.org/show_bug.cgi?id=960426
67 user_pref("dom.netinfo.enabled",                                false);
68
69 // PREF: Disable network API (Firefox < 32)
70 // https://developer.mozilla.org/en-US/docs/Web/API/Connection/onchange
71 // https://www.torproject.org/projects/torbrowser/design/#fingerprinting-defenses
72 user_pref("dom.network.enabled",                                false);
73
74 // PREF: Disable WebRTC entirely to prevent leaking internal IP addresses (Firefox < 42)
75 // NOTICE: Disabling WebRTC breaks peer-to-peer file sharing tools (reep.io ...)
76 user_pref("media.peerconnection.enabled",                       false);
77
78 // PREF: Don't reveal your internal IP when WebRTC is enabled (Firefox >= 42)
79 // https://wiki.mozilla.org/Media/WebRTC/Privacy
80 // https://github.com/beefproject/beef/wiki/Module%3A-Get-Internal-IP-WebRTC
81 user_pref("media.peerconnection.ice.default_address_only",      true); // Firefox 42-51
82 user_pref("media.peerconnection.ice.no_host",                   true); // Firefox >= 52
83
84 // PREF: Disable WebRTC getUserMedia, screen sharing, audio capture, video capture
85 // https://wiki.mozilla.org/Media/getUserMedia
86 // https://blog.mozilla.org/futurereleases/2013/01/12/capture-local-camera-and-microphone-streams-with-getusermedia-now-enabled-in-firefox/
87 // https://developer.mozilla.org/en-US/docs/Web/API/Navigator
88 user_pref("media.navigator.enabled",                            false);
89 user_pref("media.navigator.video.enabled",                      false);
90 user_pref("media.getusermedia.screensharing.enabled",           false);
91 user_pref("media.getusermedia.audiocapture.enabled",            false);
92
93 // PREF: Disable battery API (Firefox < 52)
94 // https://developer.mozilla.org/en-US/docs/Web/API/BatteryManager
95 // https://bugzilla.mozilla.org/show_bug.cgi?id=1313580
96 user_pref("dom.battery.enabled",                                false);
97
98 // PREF: Disable telephony API
99 // https://wiki.mozilla.org/WebAPI/Security/WebTelephony
100 user_pref("dom.telephony.enabled",                              false);
101
102 // PREF: Disable "beacon" asynchronous HTTP transfers (used for analytics)
103 // https://developer.mozilla.org/en-US/docs/Web/API/navigator.sendBeacon
104 user_pref("beacon.enabled",                                     false);
105
106 // PREF: Disable clipboard event detection (onCut/onCopy/onPaste) via Javascript
107 // NOTICE: Disabling clipboard events breaks Ctrl+C/X/V copy/cut/paste functionaility in JS-based web applications (Google Docs...)
108 // https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/Preference_reference/dom.event.clipboardevents.enabled
109 user_pref("dom.event.clipboardevents.enabled",                  false);
110
111 // PREF: Disable "copy to clipboard" functionality via Javascript (Firefox >= 41)
112 // NOTICE: Disabling clipboard operations will break legitimate JS-based "copy to clipboard" functionality
113 // https://hg.mozilla.org/mozilla-central/rev/2f9f8ea4b9c3
114 user_pref("dom.allow_cut_copy", false);
115
116 // PREF: Disable speech recognition
117 // https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
118 // https://developer.mozilla.org/en-US/docs/Web/API/SpeechRecognition
119 // https://wiki.mozilla.org/HTML5_Speech_API
120 user_pref("media.webspeech.recognition.enable",                 false);
121
122 // PREF: Disable speech synthesis
123 // https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis
124 user_pref("media.webspeech.synth.enabled",                      false);
125
126 // PREF: Disable sensor API
127 // https://wiki.mozilla.org/Sensor_API
128 user_pref("device.sensors.enabled",                             false);
129
130 // PREF: Disable pinging URIs specified in HTML <a> ping= attributes
131 // http://kb.mozillazine.org/Browser.send_pings
132 user_pref("browser.send_pings",                                 false);
133
134 // PREF: When browser pings are enabled, only allow pinging the same host as the origin page
135 // http://kb.mozillazine.org/Browser.send_pings.require_same_host
136 user_pref("browser.send_pings.require_same_host",               true);
137
138 // PREF: Disable IndexedDB (disabled)
139 // https://developer.mozilla.org/en-US/docs/IndexedDB
140 // https://en.wikipedia.org/wiki/Indexed_Database_API
141 // https://wiki.mozilla.org/Security/Reviews/Firefox4/IndexedDB_Security_Review
142 // http://forums.mozillazine.org/viewtopic.php?p=13842047
143 // https://github.com/pyllyukko/user.js/issues/8
144 // NOTICE-DISABLED: IndexedDB could be used for tracking purposes, but is required for some add-ons to work (notably uBlock), so is left enabled
145 //user_pref("dom.indexedDB.enabled",            false);
146
147 // TODO: "Access Your Location" "Maintain Offline Storage" "Show Notifications"
148
149 // PREF: Disable gamepad API to prevent USB device enumeration
150 // https://www.w3.org/TR/gamepad/
151 // https://trac.torproject.org/projects/tor/ticket/13023
152 user_pref("dom.gamepad.enabled",                                false);
153
154 // PREF: Disable virtual reality devices APIs
155 // https://developer.mozilla.org/en-US/Firefox/Releases/36#Interfaces.2FAPIs.2FDOM
156 // https://developer.mozilla.org/en-US/docs/Web/API/WebVR_API
157 user_pref("dom.vr.enabled",                                     false);
158
159 // PREF: Disable vibrator API
160 user_pref("dom.vibrator.enabled",           false);
161
162 // PREF: Disable resource timing API
163 // https://www.w3.org/TR/resource-timing/#privacy-security
164 user_pref("dom.enable_resource_timing",                         false);
165
166 // PREF: Disable Archive API (Firefox < 54)
167 // https://wiki.mozilla.org/WebAPI/ArchiveAPI
168 // https://bugzilla.mozilla.org/show_bug.cgi?id=1342361
169 user_pref("dom.archivereader.enabled",                          false);
170
171 // PREF: Disable webGL
172 // https://en.wikipedia.org/wiki/WebGL
173 // https://www.contextis.com/resources/blog/webgl-new-dimension-browser-exploitation/
174 user_pref("webgl.disabled",                                     true);
175 // PREF: When webGL is enabled, use the minimum capability mode
176 user_pref("webgl.min_capability_mode",                          true);
177 // PREF: When webGL is enabled, disable webGL extensions
178 // https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API#WebGL_debugging_and_testing
179 user_pref("webgl.disable-extensions",                           true);
180 // PREF: When webGL is enabled, force enabling it even when layer acceleration is not supported
181 // https://trac.torproject.org/projects/tor/ticket/18603
182 user_pref("webgl.disable-fail-if-major-performance-caveat",     true);
183 // PREF: When webGL is enabled, do not expose information about the graphics driver
184 // https://bugzilla.mozilla.org/show_bug.cgi?id=1171228
185 // https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_debug_renderer_info
186 user_pref("webgl.enable-debug-renderer-info",                   false);
187 // somewhat related...
188 //user_pref("pdfjs.enableWebGL",                                        false);
189
190 // PREF: Spoof dual-core CPU
191 // https://trac.torproject.org/projects/tor/ticket/21675
192 // https://bugzilla.mozilla.org/show_bug.cgi?id=1360039
193 user_pref("dom.maxHardwareConcurrency",                         2);
194
195 // PREF: Disable WebAssembly
196 // https://webassembly.org/
197 // https://en.wikipedia.org/wiki/WebAssembly
198 // https://trac.torproject.org/projects/tor/ticket/21549
199 // NOTICE: WebAssembly is required for Unity web player/games
200 user_pref("javascript.options.wasm",                            false);
201
202 /******************************************************************************
203  * SECTION: Misc                                                              *
204  ******************************************************************************/
205
206 // PREF: Disable face detection
207 user_pref("camera.control.face_detection.enabled",              false);
208
209 // PREF: Disable GeoIP lookup on your address to set default search engine region
210 // https://trac.torproject.org/projects/tor/ticket/16254
211 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_geolocation-for-default-search-engine
212 user_pref("browser.search.countryCode",                         "US");
213 user_pref("browser.search.region",                              "US");
214 user_pref("browser.search.geoip.url",                           "");
215
216 // PREF: Set Accept-Language HTTP header to en-US regardless of Firefox localization
217 // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language
218 user_pref("intl.accept_languages",                              "en-US, en");
219
220 // PREF: Don't use OS values to determine locale, force using Firefox locale setting
221 // http://kb.mozillazine.org/Intl.locale.matchOS
222 user_pref("intl.locale.matchOS",                                false);
223
224 // PREF: Don't use Mozilla-provided location-specific search engines
225 user_pref("browser.search.geoSpecificDefaults",                 false);
226
227 // PREF: Do not automatically send selection to clipboard on some Linux platforms
228 // http://kb.mozillazine.org/Clipboard.autocopy
229 user_pref("clipboard.autocopy",                                 false);
230
231 // PREF: Prevent leaking application locale/date format using JavaScript
232 // https://bugzilla.mozilla.org/show_bug.cgi?id=867501
233 // https://hg.mozilla.org/mozilla-central/rev/52d635f2b33d
234 user_pref("javascript.use_us_english_locale",                   true);
235
236 // PREF: Do not submit invalid URIs entered in the address bar to the default search engine
237 // http://kb.mozillazine.org/Keyword.enabled
238 user_pref("keyword.enabled",                                    false);
239
240 // PREF: Don't trim HTTP off of URLs in the address bar.
241 // https://bugzilla.mozilla.org/show_bug.cgi?id=665580
242 user_pref("browser.urlbar.trimURLs",                            false);
243
244 // PREF: Don't try to guess domain names when entering an invalid domain name in URL bar
245 // http://www-archive.mozilla.org/docs/end-user/domain-guessing.html
246 user_pref("browser.fixup.alternate.enabled",                    false);
247
248 // PREF: When browser.fixup.alternate.enabled is enabled, strip password from 'user:password@...' URLs
249 // https://github.com/pyllyukko/user.js/issues/290#issuecomment-303560851
250 user_pref("browser.fixup.hide_user_pass", true);
251
252 // PREF: Send DNS request through SOCKS when SOCKS proxying is in use
253 // https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers
254 user_pref("network.proxy.socks_remote_dns",                     true);
255
256 // PREF: Don't monitor OS online/offline connection state
257 // https://trac.torproject.org/projects/tor/ticket/18945
258 user_pref("network.manage-offline-status",                      false);
259
260 // PREF: Enforce Mixed Active Content Blocking
261 // https://support.mozilla.org/t5/Protect-your-privacy/Mixed-content-blocking-in-Firefox/ta-p/10990
262 // https://developer.mozilla.org/en-US/docs/Site_Compatibility_for_Firefox_23#Non-SSL_contents_on_SSL_pages_are_blocked_by_default
263 // https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-blocking-enabled-in-firefox-23/
264 user_pref("security.mixed_content.block_active_content",        true);
265
266 // PREF: Enforce Mixed Passive Content blocking (a.k.a. Mixed Display Content)
267 // NOTICE: Enabling Mixed Display Content blocking can prevent images/styles... from loading properly when connection to the website is only partially secured
268 user_pref("security.mixed_content.block_display_content",       true);
269
270 // PREF: Disable JAR from opening Unsafe File Types
271 // http://kb.mozillazine.org/Network.jar.open-unsafe-types
272 // CIS Mozilla Firefox 24 ESR v1.0.0 - 3.7 
273 user_pref("network.jar.open-unsafe-types",                      false);
274
275 // CIS 2.7.4 Disable Scripting of Plugins by JavaScript
276 // http://forums.mozillazine.org/viewtopic.php?f=7&t=153889
277 user_pref("security.xpconnect.plugin.unrestricted",             false);
278
279 // PREF: Set File URI Origin Policy
280 // http://kb.mozillazine.org/Security.fileuri.strict_origin_policy
281 // CIS Mozilla Firefox 24 ESR v1.0.0 - 3.8
282 user_pref("security.fileuri.strict_origin_policy",              true);
283
284 // PREF: Disable Displaying Javascript in History URLs
285 // http://kb.mozillazine.org/Browser.urlbar.filter.javascript
286 // CIS 2.3.6 
287 user_pref("browser.urlbar.filter.javascript",                   true);
288
289 // PREF: Disable asm.js
290 // http://asmjs.org/
291 // https://www.mozilla.org/en-US/security/advisories/mfsa2015-29/
292 // https://www.mozilla.org/en-US/security/advisories/mfsa2015-50/
293 // https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2712
294 user_pref("javascript.options.asmjs",                           false);
295
296 // PREF: Disable SVG in OpenType fonts
297 // https://wiki.mozilla.org/SVGOpenTypeFonts
298 // https://github.com/iSECPartners/publications/tree/master/reports/Tor%20Browser%20Bundle
299 user_pref("gfx.font_rendering.opentype_svg.enabled",            false);
300
301 // PREF: Disable in-content SVG rendering (Firefox >= 53) (disabled)
302 // NOTICE-DISABLED: Disabling SVG support breaks many UI elements on many sites
303 // https://bugzilla.mozilla.org/show_bug.cgi?id=1216893
304 // https://github.com/iSECPartners/publications/raw/master/reports/Tor%20Browser%20Bundle/Tor%20Browser%20Bundle%20-%20iSEC%20Deliverable%201.3.pdf#16
305 //user_pref("svg.disabled", true);
306
307
308 // PREF: Disable video stats to reduce fingerprinting threat
309 // https://bugzilla.mozilla.org/show_bug.cgi?id=654550
310 // https://github.com/pyllyukko/user.js/issues/9#issuecomment-100468785
311 // https://github.com/pyllyukko/user.js/issues/9#issuecomment-148922065
312 user_pref("media.video_stats.enabled",                          false);
313
314 // PREF: Don't reveal build ID
315 // Value taken from Tor Browser
316 // https://bugzilla.mozilla.org/show_bug.cgi?id=583181
317 user_pref("general.buildID.override",                           "20100101");
318 user_pref("browser.startup.homepage_override.buildID",          "20100101");
319
320 // PREF: Don't use document specified fonts to prevent installed font enumeration (fingerprinting)
321 // https://github.com/pyllyukko/user.js/issues/395
322 // https://browserleaks.com/fonts
323 // https://github.com/pyllyukko/user.js/issues/120
324 user_pref("browser.display.use_document_fonts",                 0);
325
326 // PREF: Enable only whitelisted URL protocol handlers
327 // http://kb.mozillazine.org/Network.protocol-handler.external-default
328 // http://kb.mozillazine.org/Network.protocol-handler.warn-external-default
329 // http://kb.mozillazine.org/Network.protocol-handler.expose.%28protocol%29
330 // https://news.ycombinator.com/item?id=13047883
331 // https://bugzilla.mozilla.org/show_bug.cgi?id=167475
332 // https://github.com/pyllyukko/user.js/pull/285#issuecomment-298124005
333 // NOTICE: Disabling nonessential protocols breaks all interaction with custom protocols such as mailto:, irc:, magnet: ... and breaks opening third-party mail/messaging/torrent/... clients when clicking on links with these protocols
334 // TODO: Add externally-handled protocols from Windows 8.1 and Windows 10 (currently contains protocols only from Linux and Windows 7) that might pose a similar threat (see e.g. https://news.ycombinator.com/item?id=13044991)
335 // TODO: Add externally-handled protocols from Mac OS X that might pose a similar threat (see e.g. https://news.ycombinator.com/item?id=13044991)
336 // If you want to enable a protocol, set network.protocol-handler.expose.(protocol) to true and network.protocol-handler.external.(protocol) to:
337 //   * true, if the protocol should be handled by an external application
338 //   * false, if the protocol should be handled internally by Firefox
339 user_pref("network.protocol-handler.warn-external-default",     true);
340 user_pref("network.protocol-handler.external.http",             false);
341 user_pref("network.protocol-handler.external.https",            false);
342 user_pref("network.protocol-handler.external.javascript",       false);
343 user_pref("network.protocol-handler.external.moz-extension",    false);
344 user_pref("network.protocol-handler.external.ftp",              false);
345 user_pref("network.protocol-handler.external.file",             false);
346 user_pref("network.protocol-handler.external.about",            false);
347 user_pref("network.protocol-handler.external.chrome",           false);
348 user_pref("network.protocol-handler.external.blob",             false);
349 user_pref("network.protocol-handler.external.data",             false);
350 user_pref("network.protocol-handler.expose-all",                false);
351 user_pref("network.protocol-handler.expose.http",               true);
352 user_pref("network.protocol-handler.expose.https",              true);
353 user_pref("network.protocol-handler.expose.javascript",         true);
354 user_pref("network.protocol-handler.expose.moz-extension",      true);
355 user_pref("network.protocol-handler.expose.ftp",                true);
356 user_pref("network.protocol-handler.expose.file",               true);
357 user_pref("network.protocol-handler.expose.about",              true);
358 user_pref("network.protocol-handler.expose.chrome",             true);
359 user_pref("network.protocol-handler.expose.blob",               true);
360 user_pref("network.protocol-handler.expose.data",               true);
361
362 /******************************************************************************
363  * SECTION: Extensions / plugins                                                       *
364  ******************************************************************************/
365
366 // PREF: Ensure you have a security delay when installing add-ons (milliseconds)
367 // http://kb.mozillazine.org/Disable_extension_install_delay_-_Firefox
368 // http://www.squarefree.com/2004/07/01/race-conditions-in-security-dialogs/
369 user_pref("security.dialog_enable_delay",                       1000);
370
371 // PREF: Require signatures
372 // https://wiki.mozilla.org/Addons/Extension_Signing
373 //user_pref("xpinstall.signatures.required",            true);
374
375 // PREF: Opt-out of add-on metadata updates
376 // https://blog.mozilla.org/addons/how-to-opt-out-of-add-on-metadata-updates/
377 user_pref("extensions.getAddons.cache.enabled",                 false);
378
379 // PREF: Opt-out of themes (Persona) updates
380 // https://support.mozilla.org/t5/Firefox/how-do-I-prevent-autoamtic-updates-in-a-50-user-environment/td-p/144287
381 user_pref("lightweightThemes.update.enabled",                   false);
382
383 // PREF: Disable Flash Player NPAPI plugin
384 // http://kb.mozillazine.org/Flash_plugin
385 user_pref("plugin.state.flash",                                 0);
386
387 // PREF: Disable Java NPAPI plugin
388 user_pref("plugin.state.java",                                  0);
389
390 // PREF: Disable sending Flash Player crash reports
391 user_pref("dom.ipc.plugins.flash.subprocess.crashreporter.enabled",     false);
392
393 // PREF: When Flash crash reports are enabled, don't send the visited URL in the crash report
394 user_pref("dom.ipc.plugins.reportCrashURL",                     false);
395
396 // PREF: When Flash is enabled, download and use Mozilla SWF URIs blocklist
397 // https://bugzilla.mozilla.org/show_bug.cgi?id=1237198
398 // https://github.com/mozilla-services/shavar-plugin-blocklist
399 user_pref("browser.safebrowsing.blockedURIs.enabled", true);
400
401 // PREF: Disable Gnome Shell Integration NPAPI plugin
402 user_pref("plugin.state.libgnome-shell-browser-plugin",         0);
403
404 // PREF: Disable the bundled OpenH264 video codec (disabled)
405 // http://forums.mozillazine.org/viewtopic.php?p=13845077&sid=28af2622e8bd8497b9113851676846b1#p13845077
406 //user_pref("media.gmp-provider.enabled",               false);
407
408 // PREF: Enable plugins click-to-play
409 // https://wiki.mozilla.org/Firefox/Click_To_Play
410 // https://blog.mozilla.org/security/2012/10/11/click-to-play-plugins-blocklist-style/
411 user_pref("plugins.click_to_play",                              true);
412
413 // PREF: Updates addons automatically
414 // https://blog.mozilla.org/addons/how-to-turn-off-add-on-updates/
415 user_pref("extensions.update.enabled",                          true);
416
417 // PREF: Enable add-on and certificate blocklists (OneCRL) from Mozilla
418 // https://wiki.mozilla.org/Blocklisting
419 // https://blocked.cdn.mozilla.net/
420 // http://kb.mozillazine.org/Extensions.blocklist.enabled
421 // http://kb.mozillazine.org/Extensions.blocklist.url
422 // https://blog.mozilla.org/security/2015/03/03/revoking-intermediate-certificates-introducing-onecrl/
423 // Updated at interval defined in extensions.blocklist.interval (default: 86400)
424 user_pref("extensions.blocklist.enabled",                       true);
425 user_pref("services.blocklist.update_enabled",                  true);
426
427 // PREF: Decrease system information leakage to Mozilla blocklist update servers
428 // https://trac.torproject.org/projects/tor/ticket/16931
429 user_pref("extensions.blocklist.url",                           "https://blocklist.addons.mozilla.org/blocklist/3/%APP_ID%/%APP_VERSION%/");
430
431 // PREF: Disable system add-on updates (hidden & always-enabled add-ons from Mozilla)
432 // https://firefox-source-docs.mozilla.org/toolkit/mozapps/extensions/addon-manager/SystemAddons.html
433 // https://blog.mozilla.org/data/2018/08/20/effectively-measuring-search-in-firefox/
434 // https://github.com/pyllyukko/user.js/issues/419
435 // https://dxr.mozilla.org/mozilla-central/source/toolkit/mozapps/extensions/AddonManager.jsm#1248-1257
436 // NOTICE: Disabling system add-on updates prevents Mozilla from "hotfixing" your browser to patch critical problems (one possible use case from the documentation)
437 user_pref("extensions.systemAddon.update.enabled",              false);
438
439 /******************************************************************************
440  * SECTION: Firefox (anti-)features / components                              *                            *
441  ******************************************************************************/
442
443 // PREF: Disable Extension recommendations (Firefox >= 65)
444 // https://support.mozilla.org/en-US/kb/extension-recommendations
445 user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr",  false);
446
447 // PREF: Trusted Recursive Resolver (DNS-over-HTTPS) (disabled)
448 // https://wiki.mozilla.org/Trusted_Recursive_Resolver
449 //user_pref("network.trr.mode",                                 0);
450
451 // PREF: Disable WebIDE
452 // https://trac.torproject.org/projects/tor/ticket/16222
453 // https://developer.mozilla.org/docs/Tools/WebIDE
454 user_pref("devtools.webide.enabled",                            false);
455 user_pref("devtools.webide.autoinstallADBHelper",               false);
456 user_pref("devtools.webide.autoinstallFxdtAdapters",            false);
457
458 // PREF: Disable remote debugging
459 // https://developer.mozilla.org/en-US/docs/Tools/Remote_Debugging/Debugging_Firefox_Desktop
460 // https://developer.mozilla.org/en-US/docs/Tools/Tools_Toolbox#Advanced_settings
461 user_pref("devtools.debugger.remote-enabled",                   false);
462 user_pref("devtools.chrome.enabled",                            false);
463 user_pref("devtools.debugger.force-local",                      true);
464
465 // PREF: Disable Mozilla telemetry/experiments
466 // https://wiki.mozilla.org/Platform/Features/Telemetry
467 // https://wiki.mozilla.org/Privacy/Reviews/Telemetry
468 // https://wiki.mozilla.org/Telemetry
469 // https://www.mozilla.org/en-US/legal/privacy/firefox.html#telemetry
470 // https://support.mozilla.org/t5/Firefox-crashes/Mozilla-Crash-Reporter/ta-p/1715
471 // https://wiki.mozilla.org/Security/Reviews/Firefox6/ReviewNotes/telemetry
472 // https://gecko.readthedocs.io/en/latest/browser/experiments/experiments/manifest.html
473 // https://wiki.mozilla.org/Telemetry/Experiments
474 // https://support.mozilla.org/en-US/questions/1197144
475 // https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html#id1
476 user_pref("toolkit.telemetry.enabled",                          false);
477 user_pref("toolkit.telemetry.unified",                          false);
478 user_pref("toolkit.telemetry.archive.enabled",                  false);
479 user_pref("experiments.supported",                              false);
480 user_pref("experiments.enabled",                                false);
481 user_pref("experiments.manifest.uri",                           "");
482
483 // PREF: Disallow Necko to do A/B testing
484 // https://trac.torproject.org/projects/tor/ticket/13170
485 user_pref("network.allow-experiments",                          false);
486
487 // PREF: Disable sending Firefox crash reports to Mozilla servers
488 // https://wiki.mozilla.org/Breakpad
489 // http://kb.mozillazine.org/Breakpad
490 // https://dxr.mozilla.org/mozilla-central/source/toolkit/crashreporter
491 // https://bugzilla.mozilla.org/show_bug.cgi?id=411490
492 // A list of submitted crash reports can be found at about:crashes
493 user_pref("breakpad.reportURL",                                 "");
494
495 // PREF: Disable sending reports of tab crashes to Mozilla (about:tabcrashed), don't nag user about unsent crash reports
496 // https://hg.mozilla.org/mozilla-central/file/tip/browser/app/profile/firefox.js
497 user_pref("browser.tabs.crashReporting.sendReport",             false);
498 user_pref("browser.crashReports.unsubmittedCheck.enabled",      false);
499
500 // PREF: Disable FlyWeb (discovery of LAN/proximity IoT devices that expose a Web interface)
501 // https://wiki.mozilla.org/FlyWeb
502 // https://wiki.mozilla.org/FlyWeb/Security_scenarios
503 // https://docs.google.com/document/d/1eqLb6cGjDL9XooSYEEo7mE-zKQ-o-AuDTcEyNhfBMBM/edit
504 // http://www.ghacks.net/2016/07/26/firefox-flyweb
505 user_pref("dom.flyweb.enabled",                                 false);
506
507 // PREF: Disable the UITour backend
508 // https://trac.torproject.org/projects/tor/ticket/19047#comment:3
509 user_pref("browser.uitour.enabled",                             false);
510
511 // PREF: Enable Firefox Tracking Protection
512 // https://wiki.mozilla.org/Security/Tracking_protection
513 // https://support.mozilla.org/en-US/kb/tracking-protection-firefox
514 // https://support.mozilla.org/en-US/kb/tracking-protection-pbm
515 // https://kontaxis.github.io/trackingprotectionfirefox/
516 // https://feeding.cloud.geek.nz/posts/how-tracking-protection-works-in-firefox/
517 user_pref("privacy.trackingprotection.enabled",                 true);
518 user_pref("privacy.trackingprotection.pbmode.enabled",          true);
519
520 // PREF: Enable contextual identity Containers feature (Firefox >= 52)
521 // NOTICE: Containers are not available in Private Browsing mode
522 // https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers
523 user_pref("privacy.userContext.enabled",                        true);
524
525 // PREF: Enable Firefox's anti-fingerprinting mode ("resist fingerprinting" or RFP) (Tor Uplift project)
526 // https://wiki.mozilla.org/Security/Tor_Uplift/Tracking
527 // https://bugzilla.mozilla.org/show_bug.cgi?id=1333933
528 // https://wiki.mozilla.org/Security/Fingerprinting
529 // NOTICE: RFP breaks some keyboard shortcuts used in certain websites (see #443)
530 // NOTICE: RFP changes your time zone
531 user_pref("privacy.resistFingerprinting",                       true);
532
533 // PREF: disable mozAddonManager Web API [FF57+]
534 // https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330
535 // https://bugzilla.mozilla.org/buglist.cgi?bug_id=1406795
536 // https://bugzilla.mozilla.org/buglist.cgi?bug_id=1415644
537 // https://bugzilla.mozilla.org/buglist.cgi?bug_id=1453988
538 // https://trac.torproject.org/projects/tor/ticket/26114
539 user_pref("privacy.resistFingerprinting.block_mozAddonManager", true);
540 user_pref("extensions.webextensions.restrictedDomains", "");
541
542 // PREF: enable RFP letterboxing / resizing of inner window [FF67+] (disabled)
543 // https://bugzilla.mozilla.org/1407366
544 //user_pref("privacy.resistFingerprinting.letterboxing", true);
545 //user_pref("privacy.resistFingerprinting.letterboxing.dimensions", "800x600, 1000x1000, 1600x900");
546
547 // PREF: disable showing about:blank/maximized window as soon as possible during startup [FF60+]
548 // https://bugzilla.mozilla.org/1448423
549 user_pref("browser.startup.blankWindow", false);
550
551 // PREF: Disable the built-in PDF viewer
552 // https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2743
553 // https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in-the-wild/
554 // https://www.mozilla.org/en-US/security/advisories/mfsa2015-69/
555 user_pref("pdfjs.disabled",                                     true);
556
557 // PREF: Disable collection/sending of the health report (healthreport.sqlite*)
558 // https://support.mozilla.org/en-US/kb/firefox-health-report-understand-your-browser-perf
559 // https://gecko.readthedocs.org/en/latest/toolkit/components/telemetry/telemetry/preferences.html
560 user_pref("datareporting.healthreport.uploadEnabled",           false);
561 user_pref("datareporting.healthreport.service.enabled",         false);
562 user_pref("datareporting.policy.dataSubmissionEnabled",         false);
563 // "Allow Firefox to make personalized extension recommendations"
564 user_pref("browser.discovery.enabled",                          false);
565
566 // PREF: Disable Shield/Heartbeat/Normandy (Mozilla user rating telemetry)
567 // https://wiki.mozilla.org/Advocacy/heartbeat
568 // https://trac.torproject.org/projects/tor/ticket/19047
569 // https://trac.torproject.org/projects/tor/ticket/18738
570 // https://wiki.mozilla.org/Firefox/Shield
571 // https://github.com/mozilla/normandy
572 // https://support.mozilla.org/en-US/kb/shield
573 // https://bugzilla.mozilla.org/show_bug.cgi?id=1370801
574 user_pref("app.normandy.enabled", false);
575 user_pref("app.normandy.api_url", "");
576 user_pref("extensions.shield-recipe-client.enabled",            false);
577 user_pref("app.shield.optoutstudies.enabled",                   false);
578
579
580 // PREF: Disable Firefox Hello (disabled) (Firefox < 49)
581 // https://wiki.mozilla.org/Loop
582 // https://support.mozilla.org/t5/Chat-and-share/Support-for-Hello-discontinued-in-Firefox-49/ta-p/37946
583 // NOTICE-DISABLED: Firefox Hello requires setting `media.peerconnection.enabled` and `media.getusermedia.screensharing.enabled` to true, `security.OCSP.require` to false to work.
584 //user_pref("loop.enabled",             false);
585
586 // PREF: Disable Firefox Hello metrics collection
587 // https://groups.google.com/d/topic/mozilla.dev.platform/nyVkCx-_sFw/discussion
588 user_pref("loop.logDomains",                                    false);
589
590 // PREF: Enable Auto Update (disabled)
591 // NOTICE: Fully automatic updates are disabled and left to package management systems on Linux. Windows users may want to change this setting.
592 // CIS 2.1.1
593 //user_pref("app.update.auto",                                  true);
594
595 // PREF: Enforce checking for Firefox updates
596 // http://kb.mozillazine.org/App.update.enabled
597 // NOTICE: Update check page might incorrectly report Firefox ESR as out-of-date
598 user_pref("app.update.enabled",                 true);
599
600 // PREF: Enable blocking reported web forgeries
601 // https://wiki.mozilla.org/Security/Safe_Browsing
602 // http://kb.mozillazine.org/Safe_browsing
603 // https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work
604 // http://forums.mozillazine.org/viewtopic.php?f=39&t=2711237&p=12896849#p12896849
605 // CIS 2.3.4
606 user_pref("browser.safebrowsing.enabled",                       true); // Firefox < 50
607 user_pref("browser.safebrowsing.phishing.enabled",              true); // firefox >= 50
608
609 // PREF: Enable blocking reported attack sites
610 // http://kb.mozillazine.org/Browser.safebrowsing.malware.enabled
611 // CIS 2.3.5
612 user_pref("browser.safebrowsing.malware.enabled",               true);
613
614 // PREF: Disable querying Google Application Reputation database for downloaded binary files
615 // https://www.mozilla.org/en-US/firefox/39.0/releasenotes/
616 // https://wiki.mozilla.org/Security/Application_Reputation
617 user_pref("browser.safebrowsing.downloads.remote.enabled",      false);
618
619 // PREF: Disable Pocket
620 // https://support.mozilla.org/en-US/kb/save-web-pages-later-pocket-firefox
621 // https://github.com/pyllyukko/user.js/issues/143
622 user_pref("browser.pocket.enabled",                             false);
623 user_pref("extensions.pocket.enabled",                          false);
624
625 // PREF: Disable "Recommended by Pocket" in Firefox Quantum
626 user_pref("browser.newtabpage.activity-stream.feeds.section.topstories",        false);
627
628 /******************************************************************************
629  * SECTION: Automatic connections                                             *
630  ******************************************************************************/
631
632 // PREF: Limit the connection keep-alive timeout to 15 seconds (disabled)
633 // https://github.com/pyllyukko/user.js/issues/387
634 // http://kb.mozillazine.org/Network.http.keep-alive.timeout
635 // https://httpd.apache.org/docs/current/mod/core.html#keepalivetimeout
636 //user_pref("network.http.keep-alive.timeout",                  15);
637
638 // PREF: Disable prefetching of <link rel="next"> URLs
639 // http://kb.mozillazine.org/Network.prefetch-next
640 // https://developer.mozilla.org/en-US/docs/Web/HTTP/Link_prefetching_FAQ#Is_there_a_preference_to_disable_link_prefetching.3F
641 user_pref("network.prefetch-next",                              false);
642
643 // PREF: Disable DNS prefetching
644 // http://kb.mozillazine.org/Network.dns.disablePrefetch
645 // https://developer.mozilla.org/en-US/docs/Web/HTTP/Controlling_DNS_prefetching
646 user_pref("network.dns.disablePrefetch",                        true);
647 user_pref("network.dns.disablePrefetchFromHTTPS",               true);
648
649 // PREF: Disable the predictive service (Necko)
650 // https://wiki.mozilla.org/Privacy/Reviews/Necko
651 user_pref("network.predictor.enabled",                          false);
652
653 // PREF: Reject .onion hostnames before passing the to DNS
654 // https://bugzilla.mozilla.org/show_bug.cgi?id=1228457
655 // RFC 7686
656 user_pref("network.dns.blockDotOnion",                          true);
657
658 // PREF: Disable search suggestions in the search bar
659 // http://kb.mozillazine.org/Browser.search.suggest.enabled
660 user_pref("browser.search.suggest.enabled",                     false);
661
662 // PREF: Disable "Show search suggestions in location bar results"
663 user_pref("browser.urlbar.suggest.searches",                    false);
664 // PREF: When using the location bar, don't suggest URLs from browsing history
665 user_pref("browser.urlbar.suggest.history",                     false);
666
667 // PREF: Disable SSDP
668 // https://bugzilla.mozilla.org/show_bug.cgi?id=1111967
669 user_pref("browser.casting.enabled",                            false);
670
671 // PREF: Disable automatic downloading of OpenH264 codec
672 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_media-capabilities
673 // https://andreasgal.com/2014/10/14/openh264-now-in-firefox/
674 user_pref("media.gmp-gmpopenh264.enabled",                      false);
675 user_pref("media.gmp-manager.url",                              "");
676
677 // PREF: Disable speculative pre-connections
678 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_speculative-pre-connections
679 // https://bugzilla.mozilla.org/show_bug.cgi?id=814169
680 user_pref("network.http.speculative-parallel-limit",            0);
681
682 // PREF: Disable downloading homepage snippets/messages from Mozilla
683 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_mozilla-content
684 // https://wiki.mozilla.org/Firefox/Projects/Firefox_Start/Snippet_Service
685 user_pref("browser.aboutHomeSnippets.updateUrl",                "");
686
687 // PREF: Never check updates for search engines
688 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_auto-update-checking
689 user_pref("browser.search.update",                              false);
690
691 // PREF: Disable automatic captive portal detection (Firefox >= 52.0)
692 // https://support.mozilla.org/en-US/questions/1157121
693 user_pref("network.captive-portal-service.enabled",             false);
694
695 /******************************************************************************
696  * SECTION: HTTP                                                              *
697  ******************************************************************************/
698
699 // PREF: Disallow NTLMv1
700 // https://bugzilla.mozilla.org/show_bug.cgi?id=828183
701 user_pref("network.negotiate-auth.allow-insecure-ntlm-v1",      false);
702 // it is still allowed through HTTPS. uncomment the following to disable it completely.
703 //user_pref("network.negotiate-auth.allow-insecure-ntlm-v1-https",              false);
704
705 // PREF: Enable CSP 1.1 script-nonce directive support
706 // https://bugzilla.mozilla.org/show_bug.cgi?id=855326
707 user_pref("security.csp.experimentalEnabled",                   true);
708
709 // PREF: Enable Content Security Policy (CSP)
710 // https://developer.mozilla.org/en-US/docs/Web/Security/CSP/Introducing_Content_Security_Policy
711 // https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
712 user_pref("security.csp.enable",                                true);
713
714 // PREF: Enable Subresource Integrity
715 // https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity
716 // https://wiki.mozilla.org/Security/Subresource_Integrity
717 user_pref("security.sri.enable",                                true);
718
719 // PREF: DNT HTTP header (disabled)
720 // https://www.mozilla.org/en-US/firefox/dnt/
721 // https://en.wikipedia.org/wiki/Do_not_track_header
722 // https://dnt-dashboard.mozilla.org
723 // https://github.com/pyllyukko/user.js/issues/11
724 // NOTICE: Do No Track must be enabled manually
725 //user_pref("privacy.donottrackheader.enabled",         true);
726
727 // PREF: Send a referer header with the target URI as the source (disabled)
728 // https://bugzilla.mozilla.org/show_bug.cgi?id=822869
729 // https://github.com/pyllyukko/user.js/issues/227
730 // NOTICE-DISABLED: Spoofing referers breaks functionality on websites relying on authentic referer headers
731 // NOTICE-DISABLED: Spoofing referers breaks visualisation of 3rd-party sites on the Lightbeam addon
732 // NOTICE-DISABLED: Spoofing referers disables CSRF protection on some login pages not implementing origin-header/cookie+token based CSRF protection
733 // TODO: https://github.com/pyllyukko/user.js/issues/94, commented-out XOriginPolicy/XOriginTrimmingPolicy = 2 prefs
734 //user_pref("network.http.referer.spoofSource",                 true);
735
736 // PREF: Don't send referer headers when following links across different domains
737 // https://github.com/pyllyukko/user.js/issues/227
738 // https://github.com/pyllyukko/user.js/issues/328
739 // https://feeding.cloud.geek.nz/posts/tweaking-referrer-for-privacy-in-firefox/
740 user_pref("network.http.referer.XOriginPolicy",         2);
741
742 // PREF: Accept Only 1st Party Cookies
743 // http://kb.mozillazine.org/Network.cookie.cookieBehavior#1
744 // NOTICE: Blocking 3rd-party cookies breaks a number of payment gateways
745 // CIS 2.5.1
746 user_pref("network.cookie.cookieBehavior",                      1);
747
748 // PREF: Enable first-party isolation
749 // https://bugzilla.mozilla.org/show_bug.cgi?id=1299996
750 // https://bugzilla.mozilla.org/show_bug.cgi?id=1260931
751 // https://wiki.mozilla.org/Security/FirstPartyIsolation
752 // NOTICE: First-party isolation breaks Microsoft Teams
753 // NOTICE: First-party isolation causes HTTP basic auth to ask for credentials for every new tab (see #425)
754 user_pref("privacy.firstparty.isolate",                         true);
755
756 // PREF: Make sure that third-party cookies (if enabled) never persist beyond the session.
757 // https://feeding.cloud.geek.nz/posts/tweaking-cookies-for-privacy-in-firefox/
758 // http://kb.mozillazine.org/Network.cookie.thirdparty.sessionOnly
759 // https://developer.mozilla.org/en-US/docs/Cookies_Preferences_in_Mozilla#network.cookie.thirdparty.sessionOnly
760 user_pref("network.cookie.thirdparty.sessionOnly",              true);
761
762 // PREF: Spoof User-agent (disabled)
763 //user_pref("general.useragent.override",                               "Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Firefox/45.0");
764 //user_pref("general.appname.override",                         "Netscape");
765 //user_pref("general.appversion.override",                      "5.0 (Windows)");
766 //user_pref("general.platform.override",                                "Win32");
767 //user_pref("general.oscpu.override",                           "Windows NT 6.1");
768
769 /*******************************************************************************
770  * SECTION: Caching                                                            *
771  ******************************************************************************/
772
773 // PREF: Permanently enable private browsing mode
774 // https://support.mozilla.org/en-US/kb/Private-Browsing
775 // https://wiki.mozilla.org/PrivateBrowsing
776 // NOTICE: You can not view or inspect cookies when in private browsing: https://bugzilla.mozilla.org/show_bug.cgi?id=823941
777 // NOTICE: When Javascript is enabled, Websites can detect use of Private Browsing mode
778 // NOTICE: Private browsing breaks Kerberos authentication
779 // NOTICE: Disables "Containers" functionality (see below)
780 // NOTICE: "Always use private browsing mode" (browser.privatebrowsing.autostart) disables the possibility to use password manager: https://support.mozilla.org/en-US/kb/usernames-and-passwords-are-not-saved#w_private-browsing
781 user_pref("browser.privatebrowsing.autostart",                  true);
782
783 // PREF: Do not download URLs for the offline cache
784 // http://kb.mozillazine.org/Browser.cache.offline.enable
785 user_pref("browser.cache.offline.enable",                       false);
786
787 // PREF: Clear history when Firefox closes
788 // https://support.mozilla.org/en-US/kb/Clear%20Recent%20History#w_how-do-i-make-firefox-clear-my-history-automatically
789 // NOTICE: Installing user.js will remove your browsing history, caches and local storage.
790 // NOTICE: Installing user.js **will remove your saved passwords** (https://github.com/pyllyukko/user.js/issues/27)
791 // NOTICE: Clearing open windows on Firefox exit causes 2 windows to open when Firefox starts https://bugzilla.mozilla.org/show_bug.cgi?id=1334945
792 user_pref("privacy.sanitize.sanitizeOnShutdown",                true);
793 user_pref("privacy.clearOnShutdown.cache",                      true);
794 user_pref("privacy.clearOnShutdown.cookies",                    true);
795 user_pref("privacy.clearOnShutdown.downloads",                  true);
796 user_pref("privacy.clearOnShutdown.formdata",                   true);
797 user_pref("privacy.clearOnShutdown.history",                    true);
798 user_pref("privacy.clearOnShutdown.offlineApps",                true);
799 user_pref("privacy.clearOnShutdown.sessions",                   true);
800 user_pref("privacy.clearOnShutdown.openWindows",                true);
801
802 // PREF: Set time range to "Everything" as default in "Clear Recent History"
803 user_pref("privacy.sanitize.timeSpan",                          0);
804
805 // PREF: Clear everything but "Site Preferences" in "Clear Recent History"
806 user_pref("privacy.cpd.offlineApps",                            true);
807 user_pref("privacy.cpd.cache",                                  true);
808 user_pref("privacy.cpd.cookies",                                true);
809 user_pref("privacy.cpd.downloads",                              true);
810 user_pref("privacy.cpd.formdata",                               true);
811 user_pref("privacy.cpd.history",                                true);
812 user_pref("privacy.cpd.sessions",                               true);
813
814 // PREF: Don't remember browsing history
815 user_pref("places.history.enabled",                             false);
816
817 // PREF: Disable disk cache
818 // http://kb.mozillazine.org/Browser.cache.disk.enable
819 user_pref("browser.cache.disk.enable",                          false);
820
821 // PREF: Disable memory cache (disabled)
822 // http://kb.mozillazine.org/Browser.cache.memory.enable
823 //user_pref("browser.cache.memory.enable",              false);
824
825 // PREF: Disable Caching of SSL Pages
826 // CIS Version 1.2.0 October 21st, 2011 2.5.8
827 // http://kb.mozillazine.org/Browser.cache.disk_cache_ssl
828 user_pref("browser.cache.disk_cache_ssl",                       false);
829
830 // PREF: Disable download history
831 // CIS Version 1.2.0 October 21st, 2011 2.5.5
832 user_pref("browser.download.manager.retention",                 0);
833
834 // PREF: Disable password manager (use an external password manager!)
835 // CIS Version 1.2.0 October 21st, 2011 2.5.2
836 user_pref("signon.rememberSignons",                             false);
837
838 // PREF: Disable form autofill, don't save information entered in web page forms and the Search Bar
839 user_pref("browser.formfill.enable",                            false);
840
841 // PREF: Cookies expires at the end of the session (when the browser closes)
842 // http://kb.mozillazine.org/Network.cookie.lifetimePolicy#2
843 user_pref("network.cookie.lifetimePolicy",                      2);
844
845 // PREF: Require manual intervention to autofill known username/passwords sign-in forms
846 // http://kb.mozillazine.org/Signon.autofillForms
847 // https://www.torproject.org/projects/torbrowser/design/#identifier-linkability
848 user_pref("signon.autofillForms",                               false);
849
850 // PREF: Disable formless login capture
851 // https://bugzilla.mozilla.org/show_bug.cgi?id=1166947
852 user_pref("signon.formlessCapture.enabled",                     false);
853
854 // PREF: When username/password autofill is enabled, still disable it on non-HTTPS sites
855 // https://hg.mozilla.org/integration/mozilla-inbound/rev/f0d146fe7317
856 user_pref("signon.autofillForms.http",                          false);
857
858 // PREF: Show in-content login form warning UI for insecure login fields
859 // https://hg.mozilla.org/integration/mozilla-inbound/rev/f0d146fe7317
860 user_pref("security.insecure_field_warning.contextual.enabled", true);
861
862 // PREF: Disable the password manager for pages with autocomplete=off (disabled)
863 // https://bugzilla.mozilla.org/show_bug.cgi?id=956906
864 // OWASP ASVS V9.1
865 // Does not prevent any kind of auto-completion (see browser.formfill.enable, signon.autofillForms)
866 //user_pref("signon.storeWhenAutocompleteOff",                  false);
867
868 // PREF: Delete Search and Form History
869 // CIS Version 1.2.0 October 21st, 2011 2.5.6
870 user_pref("browser.formfill.expire_days",                       0);
871
872 // PREF: Clear SSL Form Session Data
873 // http://kb.mozillazine.org/Browser.sessionstore.privacy_level#2
874 // Store extra session data for unencrypted (non-HTTPS) sites only.
875 // CIS Version 1.2.0 October 21st, 2011 2.5.7
876 // NOTE: CIS says 1, we use 2
877 user_pref("browser.sessionstore.privacy_level",                 2);
878
879 // PREF: Delete temporary files on exit
880 // https://bugzilla.mozilla.org/show_bug.cgi?id=238789
881 user_pref("browser.helperApps.deleteTempFileOnExit",            true);
882
883 // PREF: Do not create screenshots of visited pages (relates to the "new tab page" feature)
884 // https://support.mozilla.org/en-US/questions/973320
885 // https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/Preference_reference/browser.pagethumbnails.capturing_disabled
886 user_pref("browser.pagethumbnails.capturing_disabled",          true);
887
888 // PREF: Don't fetch and permanently store favicons for Windows .URL shortcuts created by drag and drop
889 // NOTICE: .URL shortcut files will be created with a generic icon
890 // Favicons are stored as .ico files in $profile_dir\shortcutCache
891 user_pref("browser.shell.shortcutFavicons",                                     false);
892
893 // PREF: Disable bookmarks backups (default: 15)
894 // http://kb.mozillazine.org/Browser.bookmarks.max_backups
895 user_pref("browser.bookmarks.max_backups", 0);
896
897 // PREF: Export bookmarks to HTML automatically when closing Firefox (disabled)
898 // https://support.mozilla.org/en-US/questions/1176242
899 //user_pref("browser.bookmarks.autoExportHTML",                                 true);
900 //user_pref("browser.bookmarks.file",   '/path/to/bookmarks-export.html');
901
902 // PREF: Disable downloading of favicons in response to favicon fingerprinting techniques
903 // https://github.com/jonasstrehle/supercookie
904 // http://kb.mozillazine.org/Browser.chrome.site_icons
905 // https://blog.mozilla.org/security/2021/01/26/supercookie-protections/
906 user_pref("browser.chrome.site_icons",                          false);
907
908 /*******************************************************************************
909  * SECTION: UI related                                                         *
910  *******************************************************************************/
911
912 // PREF: Enable insecure password warnings (login forms in non-HTTPS pages)
913 // https://blog.mozilla.org/tanvi/2016/01/28/no-more-passwords-over-http-please/
914 // https://bugzilla.mozilla.org/show_bug.cgi?id=1319119
915 // https://bugzilla.mozilla.org/show_bug.cgi?id=1217156
916 user_pref("security.insecure_password.ui.enabled",              true);
917
918 // PREF: Disable right-click menu manipulation via JavaScript (disabled)
919 //user_pref("dom.event.contextmenu.enabled",            false);
920
921 // PREF: Disable "Are you sure you want to leave this page?" popups on page close
922 // https://support.mozilla.org/en-US/questions/1043508
923 // NOTICE: disabling "beforeunload" events may lead to losing data entered in web forms
924 // Does not prevent JS leaks of the page close event.
925 // https://developer.mozilla.org/en-US/docs/Web/Events/beforeunload
926 //user_pref("dom.disable_beforeunload",    true);
927
928 // PREF: Disable Downloading on Desktop
929 // CIS 2.3.2
930 user_pref("browser.download.folderList",                        2);
931
932 // PREF: Always ask the user where to download
933 // https://developer.mozilla.org/en/Download_Manager_preferences (obsolete)
934 user_pref("browser.download.useDownloadDir",                    false);
935
936 // PREF: Disable the "new tab page" feature and show a blank tab instead
937 // https://wiki.mozilla.org/Privacy/Reviews/New_Tab
938 // 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
939 user_pref("browser.newtabpage.enabled",                         false);
940 user_pref("browser.newtab.url",                                 "about:blank");
941
942 // PREF: Disable Snippets
943 // https://wiki.mozilla.org/Firefox/Projects/Firefox_Start/Snippet_Service
944 // https://support.mozilla.org/en-US/kb/snippets-firefox-faq
945 user_pref("browser.newtabpage.activity-stream.feeds.snippets",  false);
946
947 // PREF: Disable Activity Stream
948 // https://wiki.mozilla.org/Firefox/Activity_Stream
949 user_pref("browser.newtabpage.activity-stream.enabled",         false);
950
951 // PREF: Disable new tab tile ads & preload
952 // http://www.thewindowsclub.com/disable-remove-ad-tiles-from-firefox
953 // http://forums.mozillazine.org/viewtopic.php?p=13876331#p13876331
954 // https://wiki.mozilla.org/Tiles/Technical_Documentation#Ping
955 // https://gecko.readthedocs.org/en/latest/browser/browser/DirectoryLinksProvider.html#browser-newtabpage-directory-source
956 // https://gecko.readthedocs.org/en/latest/browser/browser/DirectoryLinksProvider.html#browser-newtabpage-directory-ping
957 // TODO: deprecated? not in DXR, some dead links
958 user_pref("browser.newtabpage.enhanced",                        false);
959 user_pref("browser.newtab.preload",                             false);
960 user_pref("browser.newtabpage.directory.ping",                  "");
961 user_pref("browser.newtabpage.directory.source",                "data:text/plain,{}");
962
963 // PREF: Enable Auto Notification of Outdated Plugins (Firefox < 50)
964 // https://wiki.mozilla.org/Firefox3.6/Plugin_Update_Awareness_Security_Review
965 // CIS Version 1.2.0 October 21st, 2011 2.1.2
966 // https://hg.mozilla.org/mozilla-central/rev/304560
967 user_pref("plugins.update.notifyUser",                          true);
968
969 // PREF: Force Punycode for Internationalized Domain Names
970 // http://kb.mozillazine.org/Network.IDN_show_punycode
971 // https://www.xudongz.com/blog/2017/idn-phishing/
972 // https://wiki.mozilla.org/IDN_Display_Algorithm
973 // https://en.wikipedia.org/wiki/IDN_homograph_attack
974 // https://www.mozilla.org/en-US/security/advisories/mfsa2017-02/
975 // CIS Mozilla Firefox 24 ESR v1.0.0 - 3.6
976 user_pref("network.IDN_show_punycode",                          true);
977
978 // PREF: Disable inline autocomplete in URL bar
979 // http://kb.mozillazine.org/Inline_autocomplete
980 user_pref("browser.urlbar.autoFill",                            false);
981 user_pref("browser.urlbar.autoFill.typed",                      false);
982
983 // PREF: Disable CSS :visited selectors
984 // https://blog.mozilla.org/security/2010/03/31/plugging-the-css-history-leak/
985 // https://dbaron.org/mozilla/visited-privacy
986 user_pref("layout.css.visited_links_enabled",                   false);
987
988 // PREF: Disable URL bar autocomplete and history/bookmarks suggestions dropdown
989 // http://kb.mozillazine.org/Disabling_autocomplete_-_Firefox#Firefox_3.5
990 user_pref("browser.urlbar.autocomplete.enabled",                false);
991
992 // PREF: Do not check if Firefox is the default browser
993 user_pref("browser.shell.checkDefaultBrowser",                  false);
994
995 // PREF: When password manager is enabled, lock the password storage periodically
996 // CIS Version 1.2.0 October 21st, 2011 2.5.3 Disable Prompting for Credential Storage
997 user_pref("security.ask_for_password",                          2);
998
999 // PREF: Lock the password storage every 1 minutes (default: 30)
1000 user_pref("security.password_lifetime",                         1);
1001
1002 // PREF: Display a notification bar when websites offer data for offline use
1003 // http://kb.mozillazine.org/Browser.offline-apps.notify
1004 user_pref("browser.offline-apps.notify",                        true);
1005
1006 /******************************************************************************
1007  * SECTION: Cryptography                                                      *
1008  ******************************************************************************/
1009
1010 // PREF: Enable HTTPS-Only Mode
1011 // https://blog.mozilla.org/security/2020/11/17/firefox-83-introduces-https-only-mode/
1012 // https://www.feistyduck.com/bulletproof-tls-newsletter/issue_71_firefox_introduces_https_only_mode
1013 user_pref("dom.security.https_only_mode",                       true);
1014
1015 // PREF: Enable HSTS preload list (pre-set HSTS sites list provided by Mozilla)
1016 // https://blog.mozilla.org/security/2012/11/01/preloading-hsts/
1017 // https://wiki.mozilla.org/Privacy/Features/HSTS_Preload_List
1018 // https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security
1019 user_pref("network.stricttransportsecurity.preloadlist",        true);
1020
1021 // PREF: Enable Online Certificate Status Protocol
1022 // https://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol
1023 // https://www.imperialviolet.org/2014/04/19/revchecking.html
1024 // https://www.maikel.pro/blog/current-state-certificate-revocation-crls-ocsp/
1025 // https://wiki.mozilla.org/CA:RevocationPlan
1026 // https://wiki.mozilla.org/CA:ImprovingRevocation
1027 // https://wiki.mozilla.org/CA:OCSP-HardFail
1028 // https://news.netcraft.com/archives/2014/04/24/certificate-revocation-why-browsers-remain-affected-by-heartbleed.html
1029 // https://news.netcraft.com/archives/2013/04/16/certificate-revocation-and-the-performance-of-ocsp.html
1030 // NOTICE: OCSP leaks your IP and domains you visit to the CA when OCSP Stapling is not available on visited host
1031 // NOTICE: OCSP is vulnerable to replay attacks when nonce is not configured on the OCSP responder
1032 // NOTICE: OCSP adds latency (performance)
1033 // NOTICE: Short-lived certificates are not checked for revocation (security.pki.cert_short_lifetime_in_days, default:10)
1034 // CIS Version 1.2.0 October 21st, 2011 2.2.4
1035 user_pref("security.OCSP.enabled",                              1);
1036
1037 // PREF: Enable OCSP Stapling support
1038 // https://en.wikipedia.org/wiki/OCSP_stapling
1039 // https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
1040 // https://www.digitalocean.com/community/tutorials/how-to-configure-ocsp-stapling-on-apache-and-nginx
1041 user_pref("security.ssl.enable_ocsp_stapling",                  true);
1042
1043 // PREF: Enable OCSP Must-Staple support (Firefox >= 45)
1044 // https://blog.mozilla.org/security/2015/11/23/improving-revocation-ocsp-must-staple-and-short-lived-certificates/
1045 // https://www.entrust.com/ocsp-must-staple/
1046 // https://github.com/schomery/privacy-settings/issues/40
1047 // NOTICE: Firefox falls back on plain OCSP when must-staple is not configured on the host certificate
1048 user_pref("security.ssl.enable_ocsp_must_staple",               true);
1049
1050 // PREF: Require a valid OCSP response for OCSP enabled certificates
1051 // https://groups.google.com/forum/#!topic/mozilla.dev.security/n1G-N2-HTVA
1052 // Disabling this will make OCSP bypassable by MitM attacks suppressing OCSP responses
1053 // NOTICE: `security.OCSP.require` will make the connection fail when the OCSP responder is unavailable
1054 // NOTICE: `security.OCSP.require` is known to break browsing on some [captive portals](https://en.wikipedia.org/wiki/Captive_portal)
1055 user_pref("security.OCSP.require",                              true);
1056
1057 // PREF: Disable TLS Session Tickets
1058 // https://www.blackhat.com/us-13/briefings.html#NextGen
1059 // https://media.blackhat.com/us-13/US-13-Daigniere-TLS-Secrets-Slides.pdf
1060 // https://media.blackhat.com/us-13/US-13-Daigniere-TLS-Secrets-WP.pdf
1061 // https://bugzilla.mozilla.org/show_bug.cgi?id=917049
1062 // https://bugzilla.mozilla.org/show_bug.cgi?id=967977
1063 user_pref("security.ssl.disable_session_identifiers",           true);
1064
1065 // PREF: Only allow TLS 1.[0-3]
1066 // http://kb.mozillazine.org/Security.tls.version.*
1067 // 1 = TLS 1.0 is the minimum required / maximum supported encryption protocol. (This is the current default for the maximum supported version.)
1068 // 2 = TLS 1.1 is the minimum required / maximum supported encryption protocol.
1069 // 3 = TLS 1.2 is the minimum required / maximum supported encryption protocol.
1070 // 4 = TLS 1.3 is the minimum required / maximum supported encryption protocol.
1071 user_pref("security.tls.version.min",                           1);
1072 user_pref("security.tls.version.max",                           4);
1073
1074 // PREF: Disable insecure TLS version fallback
1075 // https://bugzilla.mozilla.org/show_bug.cgi?id=1084025
1076 // https://github.com/pyllyukko/user.js/pull/206#issuecomment-280229645
1077 user_pref("security.tls.version.fallback-limit",                3);
1078
1079 // PREF: Enforce Public Key Pinning
1080 // https://en.wikipedia.org/wiki/HTTP_Public_Key_Pinning
1081 // https://wiki.mozilla.org/SecurityEngineering/Public_Key_Pinning
1082 // "2. Strict. Pinning is always enforced."
1083 user_pref("security.cert_pinning.enforcement_level",            2);
1084
1085 // PREF: Disallow SHA-1
1086 // https://bugzilla.mozilla.org/show_bug.cgi?id=1302140
1087 // https://shattered.io/
1088 user_pref("security.pki.sha1_enforcement_level",                1);
1089
1090 // PREF: Warn the user when server doesn't support RFC 5746 ("safe" renegotiation)
1091 // https://wiki.mozilla.org/Security:Renegotiation#security.ssl.treat_unsafe_negotiation_as_broken
1092 // https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-3555
1093 user_pref("security.ssl.treat_unsafe_negotiation_as_broken",    true);
1094
1095 // PREF: Disallow connection to servers not supporting safe renegotiation (disabled)
1096 // https://wiki.mozilla.org/Security:Renegotiation#security.ssl.require_safe_negotiation
1097 // https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-3555
1098 // TODO: `security.ssl.require_safe_negotiation` is more secure but makes browsing next to impossible (2012-2014-... - `ssl_error_unsafe_negotiation` errors), so is left disabled
1099 //user_pref("security.ssl.require_safe_negotiation",            true);
1100
1101 // PREF: Disable automatic reporting of TLS connection errors
1102 // https://support.mozilla.org/en-US/kb/certificate-pinning-reports
1103 // we could also disable security.ssl.errorReporting.enabled, but I think it's
1104 // good to leave the option to report potentially malicious sites if the user
1105 // chooses to do so.
1106 // you can test this at https://pinningtest.appspot.com/
1107 user_pref("security.ssl.errorReporting.automatic",              false);
1108
1109 // PREF: Pre-populate the current URL but do not pre-fetch the certificate in the "Add Security Exception" dialog
1110 // http://kb.mozillazine.org/Browser.ssl_override_behavior
1111 // https://github.com/pyllyukko/user.js/issues/210
1112 user_pref("browser.ssl_override_behavior",                      1);
1113
1114 // PREF: Encrypted SNI (when TRR is enabled)
1115 // https://www.cloudflare.com/ssl/encrypted-sni/
1116 // https://wiki.mozilla.org/Trusted_Recursive_Resolver#ESNI
1117 // https://en.wikipedia.org/wiki/Server_Name_Indication#Security_implications_(ESNI)
1118 user_pref("network.security.esni.enabled",                      true);
1119
1120 /******************************************************************************
1121  * SECTION: Cipher suites                                                     *
1122  ******************************************************************************/
1123
1124 // PREF: Disable null ciphers
1125 user_pref("security.ssl3.rsa_null_sha",                         false);
1126 user_pref("security.ssl3.rsa_null_md5",                         false);
1127 user_pref("security.ssl3.ecdhe_rsa_null_sha",                   false);
1128 user_pref("security.ssl3.ecdhe_ecdsa_null_sha",                 false);
1129 user_pref("security.ssl3.ecdh_rsa_null_sha",                    false);
1130 user_pref("security.ssl3.ecdh_ecdsa_null_sha",                  false);
1131
1132 // PREF: Disable SEED cipher
1133 // https://en.wikipedia.org/wiki/SEED
1134 user_pref("security.ssl3.rsa_seed_sha",                         false);
1135
1136 // PREF: Disable 40/56/128-bit ciphers
1137 // 40-bit ciphers
1138 user_pref("security.ssl3.rsa_rc4_40_md5",                       false);
1139 user_pref("security.ssl3.rsa_rc2_40_md5",                       false);
1140 // 56-bit ciphers
1141 user_pref("security.ssl3.rsa_1024_rc4_56_sha",                  false);
1142 // 128-bit ciphers
1143 user_pref("security.ssl3.rsa_camellia_128_sha",                 false);
1144 user_pref("security.ssl3.ecdhe_rsa_aes_128_sha",                false);
1145 user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha",              false);
1146 user_pref("security.ssl3.ecdh_rsa_aes_128_sha",                 false);
1147 user_pref("security.ssl3.ecdh_ecdsa_aes_128_sha",               false);
1148 user_pref("security.ssl3.dhe_rsa_camellia_128_sha",             false);
1149 user_pref("security.ssl3.dhe_rsa_aes_128_sha",                  false);
1150
1151 // PREF: Disable RC4
1152 // https://developer.mozilla.org/en-US/Firefox/Releases/38#Security
1153 // https://bugzilla.mozilla.org/show_bug.cgi?id=1138882
1154 // https://rc4.io/
1155 // https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-2566
1156 user_pref("security.ssl3.ecdh_ecdsa_rc4_128_sha",               false);
1157 user_pref("security.ssl3.ecdh_rsa_rc4_128_sha",                 false);
1158 user_pref("security.ssl3.ecdhe_ecdsa_rc4_128_sha",              false);
1159 user_pref("security.ssl3.ecdhe_rsa_rc4_128_sha",                false);
1160 user_pref("security.ssl3.rsa_rc4_128_md5",                      false);
1161 user_pref("security.ssl3.rsa_rc4_128_sha",                      false);
1162 user_pref("security.tls.unrestricted_rc4_fallback",             false);
1163
1164 // PREF: Disable 3DES (effective key size is < 128)
1165 // https://en.wikipedia.org/wiki/3des#Security
1166 // http://en.citizendium.org/wiki/Meet-in-the-middle_attack
1167 // http://www-archive.mozilla.org/projects/security/pki/nss/ssl/fips-ssl-ciphersuites.html
1168 user_pref("security.ssl3.dhe_dss_des_ede3_sha",                 false);
1169 user_pref("security.ssl3.dhe_rsa_des_ede3_sha",                 false);
1170 user_pref("security.ssl3.ecdh_ecdsa_des_ede3_sha",              false);
1171 user_pref("security.ssl3.ecdh_rsa_des_ede3_sha",                false);
1172 user_pref("security.ssl3.ecdhe_ecdsa_des_ede3_sha",             false);
1173 user_pref("security.ssl3.ecdhe_rsa_des_ede3_sha",               false);
1174 user_pref("security.ssl3.rsa_des_ede3_sha",                     false);
1175 user_pref("security.ssl3.rsa_fips_des_ede3_sha",                false);
1176
1177 // PREF: Disable ciphers with ECDH (non-ephemeral)
1178 user_pref("security.ssl3.ecdh_rsa_aes_256_sha",                 false);
1179 user_pref("security.ssl3.ecdh_ecdsa_aes_256_sha",               false);
1180
1181 // PREF: Disable 256 bits ciphers without PFS
1182 user_pref("security.ssl3.rsa_camellia_256_sha",                 false);
1183
1184 // PREF: Enable GCM ciphers (TLSv1.2 only)
1185 // https://en.wikipedia.org/wiki/Galois/Counter_Mode
1186 user_pref("security.ssl3.ecdhe_ecdsa_aes_128_gcm_sha256",       true); // 0xc02b
1187 user_pref("security.ssl3.ecdhe_rsa_aes_128_gcm_sha256",         true); // 0xc02f
1188
1189 // PREF: Enable ChaCha20 and Poly1305 (Firefox >= 47)
1190 // https://www.mozilla.org/en-US/firefox/47.0/releasenotes/
1191 // https://tools.ietf.org/html/rfc7905
1192 // https://bugzilla.mozilla.org/show_bug.cgi?id=917571
1193 // https://bugzilla.mozilla.org/show_bug.cgi?id=1247860
1194 // https://cr.yp.to/chacha.html
1195 user_pref("security.ssl3.ecdhe_ecdsa_chacha20_poly1305_sha256", true);
1196 user_pref("security.ssl3.ecdhe_rsa_chacha20_poly1305_sha256",   true);
1197
1198 // PREF: Disable ciphers susceptible to the logjam attack
1199 // https://weakdh.org/
1200 user_pref("security.ssl3.dhe_rsa_camellia_256_sha",             false);
1201 user_pref("security.ssl3.dhe_rsa_aes_256_sha",                  false);
1202
1203 // PREF: Disable ciphers with DSA (max 1024 bits)
1204 user_pref("security.ssl3.dhe_dss_aes_128_sha",                  false);
1205 user_pref("security.ssl3.dhe_dss_aes_256_sha",                  false);
1206 user_pref("security.ssl3.dhe_dss_camellia_128_sha",             false);
1207 user_pref("security.ssl3.dhe_dss_camellia_256_sha",             false);
1208
1209 // PREF: Ciphers with CBC & SHA-1 (disabled)
1210 //user_pref("security.ssl3.rsa_aes_256_sha",                    false); // 0x35
1211 //user_pref("security.ssl3.rsa_aes_128_sha",                    false); // 0x2f
1212 //user_pref("security.ssl3.ecdhe_rsa_aes_256_sha",              false); // 0xc014
1213 //user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha",            false); // 0xc00a