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"System add-on" -> "system add-on updates"
[user-js.git] / user.js
blob8da0799dcd317eb2f818b2b013dfa53b1651735c
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 Workers
21 // https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers
22 // https://www.w3schools.com/html/html5_webworkers.asp
23 // NOTICE: Disabling Web Workers breaks "Download as ZIP" functionality on https://mega.nz/, WhatsApp Web, upload on https://www.virustotal.com/,  and probably others
24 user_pref("dom.workers.enabled",                                        false);
25
26 // PREF: Disable web notifications
27 // https://support.mozilla.org/en-US/questions/1140439
28 user_pref("dom.webnotifications.enabled",                       false);
29
30 // PREF: Disable DOM timing API
31 // https://wiki.mozilla.org/Security/Reviews/Firefox/NavigationTimingAPI
32 // https://www.w3.org/TR/navigation-timing/#privacy
33 user_pref("dom.enable_performance",                             false);
34
35 // PREF: Make sure the User Timing API does not provide a new high resolution timestamp
36 // https://trac.torproject.org/projects/tor/ticket/16336
37 // https://www.w3.org/TR/2013/REC-user-timing-20131212/#privacy-security
38 user_pref("dom.enable_user_timing",                             false);
39
40 // PREF: Disable Web Audio API
41 // https://bugzilla.mozilla.org/show_bug.cgi?id=1288359
42 user_pref("dom.webaudio.enabled",                               false);
43
44 // PREF: Disable Location-Aware Browsing (geolocation)
45 // https://www.mozilla.org/en-US/firefox/geolocation/
46 user_pref("geo.enabled",                                        false);
47
48 // PREF: When geolocation is enabled, use Mozilla geolocation service instead of Google
49 // https://bugzilla.mozilla.org/show_bug.cgi?id=689252
50 user_pref("geo.wifi.uri", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
51
52 // PREF: When geolocation is enabled, don't log geolocation requests to the console
53 user_pref("geo.wifi.logging.enabled", false);
54
55 // PREF: Disable raw TCP socket support (mozTCPSocket)
56 // https://trac.torproject.org/projects/tor/ticket/18863
57 // https://www.mozilla.org/en-US/security/advisories/mfsa2015-97/
58 // https://developer.mozilla.org/docs/Mozilla/B2G_OS/API/TCPSocket
59 user_pref("dom.mozTCPSocket.enabled",                           false);
60
61 // PREF: Disable DOM storage (disabled)
62 // http://kb.mozillazine.org/Dom.storage.enabled
63 // https://html.spec.whatwg.org/multipage/webstorage.html
64 // NOTICE-DISABLED: Disabling DOM storage is known to cause`TypeError: localStorage is null` errors
65 //user_pref("dom.storage.enabled",              false);
66
67 // PREF: Disable leaking network/browser connection information via Javascript
68 // Network Information API provides general information about the system's connection type (WiFi, cellular, etc.)
69 // https://developer.mozilla.org/en-US/docs/Web/API/Network_Information_API
70 // https://wicg.github.io/netinfo/#privacy-considerations
71 // https://bugzilla.mozilla.org/show_bug.cgi?id=960426
72 user_pref("dom.netinfo.enabled",                                false);
73
74 // PREF: Disable network API (Firefox < 32)
75 // https://developer.mozilla.org/en-US/docs/Web/API/Connection/onchange
76 // https://www.torproject.org/projects/torbrowser/design/#fingerprinting-defenses
77 user_pref("dom.network.enabled",                                false);
78
79 // PREF: Disable WebRTC entirely to prevent leaking internal IP addresses (Firefox < 42)
80 // NOTICE: Disabling WebRTC breaks peer-to-peer file sharing tools (reep.io ...)
81 user_pref("media.peerconnection.enabled",                       false);
82
83 // PREF: Don't reveal your internal IP when WebRTC is enabled (Firefox >= 42)
84 // https://wiki.mozilla.org/Media/WebRTC/Privacy
85 // https://github.com/beefproject/beef/wiki/Module%3A-Get-Internal-IP-WebRTC
86 user_pref("media.peerconnection.ice.default_address_only",      true); // Firefox 42-51
87 user_pref("media.peerconnection.ice.no_host",                   true); // Firefox >= 52
88
89 // PREF: Disable WebRTC getUserMedia, screen sharing, audio capture, video capture
90 // https://wiki.mozilla.org/Media/getUserMedia
91 // https://blog.mozilla.org/futurereleases/2013/01/12/capture-local-camera-and-microphone-streams-with-getusermedia-now-enabled-in-firefox/
92 // https://developer.mozilla.org/en-US/docs/Web/API/Navigator
93 user_pref("media.navigator.enabled",                            false);
94 user_pref("media.navigator.video.enabled",                      false);
95 user_pref("media.getusermedia.screensharing.enabled",           false);
96 user_pref("media.getusermedia.audiocapture.enabled",            false);
97
98 // PREF: Disable battery API (Firefox < 52)
99 // https://developer.mozilla.org/en-US/docs/Web/API/BatteryManager
100 // https://bugzilla.mozilla.org/show_bug.cgi?id=1313580
101 user_pref("dom.battery.enabled",                                false);
102
103 // PREF: Disable telephony API
104 // https://wiki.mozilla.org/WebAPI/Security/WebTelephony
105 user_pref("dom.telephony.enabled",                              false);
106
107 // PREF: Disable "beacon" asynchronous HTTP transfers (used for analytics)
108 // https://developer.mozilla.org/en-US/docs/Web/API/navigator.sendBeacon
109 user_pref("beacon.enabled",                                     false);
110
111 // PREF: Disable clipboard event detection (onCut/onCopy/onPaste) via Javascript
112 // NOTICE: Disabling clipboard events breaks Ctrl+C/X/V copy/cut/paste functionaility in JS-based web applications (Google Docs...)
113 // https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/Preference_reference/dom.event.clipboardevents.enabled
114 user_pref("dom.event.clipboardevents.enabled",                  false);
115
116 // PREF: Disable "copy to clipboard" functionality via Javascript (Firefox >= 41)
117 // NOTICE: Disabling clipboard operations will break legitimate JS-based "copy to clipboard" functionality
118 // https://hg.mozilla.org/mozilla-central/rev/2f9f8ea4b9c3
119 user_pref("dom.allow_cut_copy", false);
120
121 // PREF: Disable speech recognition
122 // https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
123 // https://developer.mozilla.org/en-US/docs/Web/API/SpeechRecognition
124 // https://wiki.mozilla.org/HTML5_Speech_API
125 user_pref("media.webspeech.recognition.enable",                 false);
126
127 // PREF: Disable speech synthesis
128 // https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis
129 user_pref("media.webspeech.synth.enabled",                      false);
130
131 // PREF: Disable sensor API
132 // https://wiki.mozilla.org/Sensor_API
133 user_pref("device.sensors.enabled",                             false);
134
135 // PREF: Disable pinging URIs specified in HTML <a> ping= attributes
136 // http://kb.mozillazine.org/Browser.send_pings
137 user_pref("browser.send_pings",                                 false);
138
139 // PREF: When browser pings are enabled, only allow pinging the same host as the origin page
140 // http://kb.mozillazine.org/Browser.send_pings.require_same_host
141 user_pref("browser.send_pings.require_same_host",               true);
142
143 // PREF: Disable IndexedDB (disabled)
144 // https://developer.mozilla.org/en-US/docs/IndexedDB
145 // https://en.wikipedia.org/wiki/Indexed_Database_API
146 // https://wiki.mozilla.org/Security/Reviews/Firefox4/IndexedDB_Security_Review
147 // http://forums.mozillazine.org/viewtopic.php?p=13842047
148 // https://github.com/pyllyukko/user.js/issues/8
149 // NOTICE-DISABLED: IndexedDB could be used for tracking purposes, but is required for some add-ons to work (notably uBlock), so is left enabled
150 //user_pref("dom.indexedDB.enabled",            false);
151
152 // TODO: "Access Your Location" "Maintain Offline Storage" "Show Notifications"
153
154 // PREF: Disable gamepad API to prevent USB device enumeration
155 // https://www.w3.org/TR/gamepad/
156 // https://trac.torproject.org/projects/tor/ticket/13023
157 user_pref("dom.gamepad.enabled",                                false);
158
159 // PREF: Disable virtual reality devices APIs
160 // https://developer.mozilla.org/en-US/Firefox/Releases/36#Interfaces.2FAPIs.2FDOM
161 // https://developer.mozilla.org/en-US/docs/Web/API/WebVR_API
162 user_pref("dom.vr.enabled",                                     false);
163
164 // PREF: Disable vibrator API
165 user_pref("dom.vibrator.enabled",           false);
166
167 // PREF: Disable resource timing API
168 // https://www.w3.org/TR/resource-timing/#privacy-security
169 user_pref("dom.enable_resource_timing",                         false);
170
171 // PREF: Disable Archive API (Firefox < 54)
172 // https://wiki.mozilla.org/WebAPI/ArchiveAPI
173 // https://bugzilla.mozilla.org/show_bug.cgi?id=1342361
174 user_pref("dom.archivereader.enabled",                          false);
175
176 // PREF: Disable webGL
177 // https://en.wikipedia.org/wiki/WebGL
178 // https://www.contextis.com/resources/blog/webgl-new-dimension-browser-exploitation/
179 user_pref("webgl.disabled",                                     true);
180 // PREF: When webGL is enabled, use the minimum capability mode
181 user_pref("webgl.min_capability_mode",                          true);
182 // PREF: When webGL is enabled, disable webGL extensions
183 // https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API#WebGL_debugging_and_testing
184 user_pref("webgl.disable-extensions",                           true);
185 // PREF: When webGL is enabled, force enabling it even when layer acceleration is not supported
186 // https://trac.torproject.org/projects/tor/ticket/18603
187 user_pref("webgl.disable-fail-if-major-performance-caveat",     true);
188 // PREF: When webGL is enabled, do not expose information about the graphics driver
189 // https://bugzilla.mozilla.org/show_bug.cgi?id=1171228
190 // https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_debug_renderer_info
191 user_pref("webgl.enable-debug-renderer-info",                   false);
192 // somewhat related...
193 //user_pref("pdfjs.enableWebGL",                                        false);
194
195 // PREF: Spoof dual-core CPU
196 // https://trac.torproject.org/projects/tor/ticket/21675
197 // https://bugzilla.mozilla.org/show_bug.cgi?id=1360039
198 user_pref("dom.maxHardwareConcurrency",                         2);
199
200 // PREF: Disable WebAssembly
201 user_pref("javascript.options.wasm",                            false);
202
203 /******************************************************************************
204  * SECTION: Misc                                                              *
205  ******************************************************************************/
206
207 // PREF: Disable face detection
208 user_pref("camera.control.face_detection.enabled",              false);
209
210 // PREF: Disable GeoIP lookup on your address to set default search engine region
211 // https://trac.torproject.org/projects/tor/ticket/16254
212 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_geolocation-for-default-search-engine
213 user_pref("browser.search.countryCode",                         "US");
214 user_pref("browser.search.region",                              "US");
215 user_pref("browser.search.geoip.url",                           "");
216
217 // PREF: Set Accept-Language HTTP header to en-US regardless of Firefox localization
218 // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Language
219 user_pref("intl.accept_languages",                              "en-US, en");
220
221 // PREF: Don't use OS values to determine locale, force using Firefox locale setting
222 // http://kb.mozillazine.org/Intl.locale.matchOS
223 user_pref("intl.locale.matchOS",                                false);
224
225 // PREF: Don't use Mozilla-provided location-specific search engines
226 user_pref("browser.search.geoSpecificDefaults",                 false);
227
228 // PREF: Do not automatically send selection to clipboard on some Linux platforms
229 // http://kb.mozillazine.org/Clipboard.autocopy
230 user_pref("clipboard.autocopy",                                 false);
231
232 // PREF: Prevent leaking application locale/date format using JavaScript
233 // https://bugzilla.mozilla.org/show_bug.cgi?id=867501
234 // https://hg.mozilla.org/mozilla-central/rev/52d635f2b33d
235 user_pref("javascript.use_us_english_locale",                   true);
236
237 // PREF: Do not submit invalid URIs entered in the address bar to the default search engine
238 // http://kb.mozillazine.org/Keyword.enabled
239 user_pref("keyword.enabled",                                    false);
240
241 // PREF: Don't trim HTTP off of URLs in the address bar.
242 // https://bugzilla.mozilla.org/show_bug.cgi?id=665580
243 user_pref("browser.urlbar.trimURLs",                            false);
244
245 // PREF: Don't try to guess domain names when entering an invalid domain name in URL bar
246 // http://www-archive.mozilla.org/docs/end-user/domain-guessing.html
247 user_pref("browser.fixup.alternate.enabled",                    false);
248
249 // PREF: When browser.fixup.alternate.enabled is enabled, strip password from 'user:password@...' URLs
250 // https://github.com/pyllyukko/user.js/issues/290#issuecomment-303560851
251 user_pref("browser.fixup.hide_user_pass", true);
252
253 // PREF: Send DNS request through SOCKS when SOCKS proxying is in use
254 // https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers
255 user_pref("network.proxy.socks_remote_dns",                     true);
256
257 // PREF: Don't monitor OS online/offline connection state
258 // https://trac.torproject.org/projects/tor/ticket/18945
259 user_pref("network.manage-offline-status",                      false);
260
261 // PREF: Enforce Mixed Active Content Blocking
262 // https://support.mozilla.org/t5/Protect-your-privacy/Mixed-content-blocking-in-Firefox/ta-p/10990
263 // https://developer.mozilla.org/en-US/docs/Site_Compatibility_for_Firefox_23#Non-SSL_contents_on_SSL_pages_are_blocked_by_default
264 // https://blog.mozilla.org/tanvi/2013/04/10/mixed-content-blocking-enabled-in-firefox-23/
265 user_pref("security.mixed_content.block_active_content",        true);
266
267 // PREF: Enforce Mixed Passive Content blocking (a.k.a. Mixed Display Content)
268 // NOTICE: Enabling Mixed Display Content blocking can prevent images/styles... from loading properly when connection to the website is only partially secured
269 user_pref("security.mixed_content.block_display_content",       true);
270
271 // PREF: Disable JAR from opening Unsafe File Types
272 // http://kb.mozillazine.org/Network.jar.open-unsafe-types
273 // CIS Mozilla Firefox 24 ESR v1.0.0 - 3.7 
274 user_pref("network.jar.open-unsafe-types",                      false);
275
276 // CIS 2.7.4 Disable Scripting of Plugins by JavaScript
277 // http://forums.mozillazine.org/viewtopic.php?f=7&t=153889
278 user_pref("security.xpconnect.plugin.unrestricted",             false);
279
280 // PREF: Set File URI Origin Policy
281 // http://kb.mozillazine.org/Security.fileuri.strict_origin_policy
282 // CIS Mozilla Firefox 24 ESR v1.0.0 - 3.8
283 user_pref("security.fileuri.strict_origin_policy",              true);
284
285 // PREF: Disable Displaying Javascript in History URLs
286 // http://kb.mozillazine.org/Browser.urlbar.filter.javascript
287 // CIS 2.3.6 
288 user_pref("browser.urlbar.filter.javascript",                   true);
289
290 // PREF: Disable asm.js
291 // http://asmjs.org/
292 // https://www.mozilla.org/en-US/security/advisories/mfsa2015-29/
293 // https://www.mozilla.org/en-US/security/advisories/mfsa2015-50/
294 // https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-2712
295 user_pref("javascript.options.asmjs",                           false);
296
297 // PREF: Disable SVG in OpenType fonts
298 // https://wiki.mozilla.org/SVGOpenTypeFonts
299 // https://github.com/iSECPartners/publications/tree/master/reports/Tor%20Browser%20Bundle
300 user_pref("gfx.font_rendering.opentype_svg.enabled",            false);
301
302 // PREF: Disable in-content SVG rendering (Firefox >= 53)
303 // NOTICE: Disabling SVG support breaks many UI elements on many sites
304 // https://bugzilla.mozilla.org/show_bug.cgi?id=1216893
305 // https://github.com/iSECPartners/publications/raw/master/reports/Tor%20Browser%20Bundle/Tor%20Browser%20Bundle%20-%20iSEC%20Deliverable%201.3.pdf#16
306 user_pref("svg.disabled", true);
307
308
309 // PREF: Disable video stats to reduce fingerprinting threat
310 // https://bugzilla.mozilla.org/show_bug.cgi?id=654550
311 // https://github.com/pyllyukko/user.js/issues/9#issuecomment-100468785
312 // https://github.com/pyllyukko/user.js/issues/9#issuecomment-148922065
313 user_pref("media.video_stats.enabled",                          false);
314
315 // PREF: Don't reveal build ID
316 // Value taken from Tor Browser
317 // https://bugzilla.mozilla.org/show_bug.cgi?id=583181
318 user_pref("general.buildID.override",                           "20100101");
319 user_pref("browser.startup.homepage_override.buildID",          "20100101");
320
321 // PREF: Prevent font fingerprinting
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 Shumway (Mozilla Flash renderer)
402 // https://developer.mozilla.org/en-US/docs/Mozilla/Projects/Shumway
403 user_pref("shumway.disabled", true);
404
405 // PREF: Disable Gnome Shell Integration NPAPI plugin
406 user_pref("plugin.state.libgnome-shell-browser-plugin",         0);
407
408 // PREF: Disable the bundled OpenH264 video codec (disabled)
409 // http://forums.mozillazine.org/viewtopic.php?p=13845077&sid=28af2622e8bd8497b9113851676846b1#p13845077
410 //user_pref("media.gmp-provider.enabled",               false);
411
412 // PREF: Enable plugins click-to-play
413 // https://wiki.mozilla.org/Firefox/Click_To_Play
414 // https://blog.mozilla.org/security/2012/10/11/click-to-play-plugins-blocklist-style/
415 user_pref("plugins.click_to_play",                              true);
416
417 // PREF: Updates addons automatically
418 // https://blog.mozilla.org/addons/how-to-turn-off-add-on-updates/
419 user_pref("extensions.update.enabled",                          true);
420
421 // PREF: Enable add-on and certificate blocklists (OneCRL) from Mozilla
422 // https://wiki.mozilla.org/Blocklisting
423 // https://blocked.cdn.mozilla.net/
424 // http://kb.mozillazine.org/Extensions.blocklist.enabled
425 // http://kb.mozillazine.org/Extensions.blocklist.url
426 // https://blog.mozilla.org/security/2015/03/03/revoking-intermediate-certificates-introducing-onecrl/
427 // Updated at interval defined in extensions.blocklist.interval (default: 86400)
428 user_pref("extensions.blocklist.enabled",                       true);
429 user_pref("services.blocklist.update_enabled",                  true);
430
431 // PREF: Decrease system information leakage to Mozilla blocklist update servers
432 // https://trac.torproject.org/projects/tor/ticket/16931
433 user_pref("extensions.blocklist.url",                           "https://blocklist.addons.mozilla.org/blocklist/3/%APP_ID%/%APP_VERSION%/");
434
435 // PREF: Disable system add-on updates (hidden & always-enabled add-ons from Mozilla)
436 // https://firefox-source-docs.mozilla.org/toolkit/mozapps/extensions/addon-manager/SystemAddons.html
437 // https://blog.mozilla.org/data/2018/08/20/effectively-measuring-search-in-firefox/
438 // https://github.com/pyllyukko/user.js/issues/419
439 // https://dxr.mozilla.org/mozilla-central/source/toolkit/mozapps/extensions/AddonManager.jsm#1248-1257
440 // NOTICE: Disabling system add-on updates prevents Mozilla from "hotfixing" your browser to patch critical problems (one possible use case from the documentation)
441 user_pref("extensions.systemAddon.update.enabled",              false);
442
443 /******************************************************************************
444  * SECTION: Firefox (anti-)features / components                              *                            *
445  ******************************************************************************/
446
447 // PREF: Disable WebIDE
448 // https://trac.torproject.org/projects/tor/ticket/16222
449 // https://developer.mozilla.org/docs/Tools/WebIDE
450 user_pref("devtools.webide.enabled",                            false);
451 user_pref("devtools.webide.autoinstallADBHelper",               false);
452 user_pref("devtools.webide.autoinstallFxdtAdapters",            false);
453
454 // PREF: Disable remote debugging
455 // https://developer.mozilla.org/en-US/docs/Tools/Remote_Debugging/Debugging_Firefox_Desktop
456 // https://developer.mozilla.org/en-US/docs/Tools/Tools_Toolbox#Advanced_settings
457 user_pref("devtools.debugger.remote-enabled",                   false);
458 user_pref("devtools.chrome.enabled",                            false);
459 user_pref("devtools.debugger.force-local",                      true);
460
461 // PREF: Disable Mozilla telemetry/experiments
462 // https://wiki.mozilla.org/Platform/Features/Telemetry
463 // https://wiki.mozilla.org/Privacy/Reviews/Telemetry
464 // https://wiki.mozilla.org/Telemetry
465 // https://www.mozilla.org/en-US/legal/privacy/firefox.html#telemetry
466 // https://support.mozilla.org/t5/Firefox-crashes/Mozilla-Crash-Reporter/ta-p/1715
467 // https://wiki.mozilla.org/Security/Reviews/Firefox6/ReviewNotes/telemetry
468 // https://gecko.readthedocs.io/en/latest/browser/experiments/experiments/manifest.html
469 // https://wiki.mozilla.org/Telemetry/Experiments
470 user_pref("toolkit.telemetry.enabled",                          false);
471 user_pref("toolkit.telemetry.unified",                          false);
472 user_pref("experiments.supported",                              false);
473 user_pref("experiments.enabled",                                false);
474 user_pref("experiments.manifest.uri",                           "");
475
476 // PREF: Disallow Necko to do A/B testing
477 // https://trac.torproject.org/projects/tor/ticket/13170
478 user_pref("network.allow-experiments",                          false);
479
480 // PREF: Disable sending Firefox crash reports to Mozilla servers
481 // https://wiki.mozilla.org/Breakpad
482 // http://kb.mozillazine.org/Breakpad
483 // https://dxr.mozilla.org/mozilla-central/source/toolkit/crashreporter
484 // https://bugzilla.mozilla.org/show_bug.cgi?id=411490
485 // A list of submitted crash reports can be found at about:crashes
486 user_pref("breakpad.reportURL",                                 "");
487
488 // PREF: Disable sending reports of tab crashes to Mozilla (about:tabcrashed), don't nag user about unsent crash reports
489 // https://hg.mozilla.org/mozilla-central/file/tip/browser/app/profile/firefox.js
490 user_pref("browser.tabs.crashReporting.sendReport",             false);
491 user_pref("browser.crashReports.unsubmittedCheck.enabled",      false);
492
493 // PREF: Disable FlyWeb (discovery of LAN/proximity IoT devices that expose a Web interface)
494 // https://wiki.mozilla.org/FlyWeb
495 // https://wiki.mozilla.org/FlyWeb/Security_scenarios
496 // https://docs.google.com/document/d/1eqLb6cGjDL9XooSYEEo7mE-zKQ-o-AuDTcEyNhfBMBM/edit
497 // http://www.ghacks.net/2016/07/26/firefox-flyweb
498 user_pref("dom.flyweb.enabled",                                 false);
499
500 // PREF: Disable the UITour backend
501 // https://trac.torproject.org/projects/tor/ticket/19047#comment:3
502 user_pref("browser.uitour.enabled",                             false);
503
504 // PREF: Enable Firefox Tracking Protection
505 // https://wiki.mozilla.org/Security/Tracking_protection
506 // https://support.mozilla.org/en-US/kb/tracking-protection-firefox
507 // https://support.mozilla.org/en-US/kb/tracking-protection-pbm
508 // https://kontaxis.github.io/trackingprotectionfirefox/
509 // https://feeding.cloud.geek.nz/posts/how-tracking-protection-works-in-firefox/
510 user_pref("privacy.trackingprotection.enabled",                 true);
511 user_pref("privacy.trackingprotection.pbmode.enabled",          true);
512
513 // PREF: Enable contextual identity Containers feature (Firefox >= 52)
514 // NOTICE: Containers are not available in Private Browsing mode
515 // https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers
516 user_pref("privacy.userContext.enabled",                        true);
517
518 // PREF: Enable hardening against various fingerprinting vectors (Tor Uplift project)
519 // https://wiki.mozilla.org/Security/Tor_Uplift/Tracking
520 // https://bugzilla.mozilla.org/show_bug.cgi?id=1333933
521 user_pref("privacy.resistFingerprinting",                       true);
522
523 // PREF: Disable the built-in PDF viewer
524 // https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-2743
525 // https://blog.mozilla.org/security/2015/08/06/firefox-exploit-found-in-the-wild/
526 // https://www.mozilla.org/en-US/security/advisories/mfsa2015-69/
527 user_pref("pdfjs.disabled",                                     true);
528
529 // PREF: Disable collection/sending of the health report (healthreport.sqlite*)
530 // https://support.mozilla.org/en-US/kb/firefox-health-report-understand-your-browser-perf
531 // https://gecko.readthedocs.org/en/latest/toolkit/components/telemetry/telemetry/preferences.html
532 user_pref("datareporting.healthreport.uploadEnabled",           false);
533 user_pref("datareporting.healthreport.service.enabled",         false);
534 user_pref("datareporting.policy.dataSubmissionEnabled",         false);
535
536 // PREF: Disable Heartbeat  (Mozilla user rating telemetry)
537 // https://wiki.mozilla.org/Advocacy/heartbeat
538 // https://trac.torproject.org/projects/tor/ticket/19047
539 user_pref("browser.selfsupport.url",                            "");
540
541 // PREF: Disable Firefox Hello (disabled) (Firefox < 49)
542 // https://wiki.mozilla.org/Loop
543 // https://support.mozilla.org/t5/Chat-and-share/Support-for-Hello-discontinued-in-Firefox-49/ta-p/37946
544 // NOTICE-DISABLED: Firefox Hello requires setting `media.peerconnection.enabled` and `media.getusermedia.screensharing.enabled` to true, `security.OCSP.require` to false to work.
545 //user_pref("loop.enabled",             false);
546
547 // PREF: Disable Firefox Hello metrics collection
548 // https://groups.google.com/d/topic/mozilla.dev.platform/nyVkCx-_sFw/discussion
549 user_pref("loop.logDomains",                                    false);
550
551 // PREF: Enable Auto Update (disabled)
552 // NOTICE: Fully automatic updates are disabled and left to package management systems on Linux. Windows users may want to change this setting.
553 // CIS 2.1.1
554 //user_pref("app.update.auto",                                  true);
555
556 // PREF: Enforce checking for Firefox updates
557 // http://kb.mozillazine.org/App.update.enabled
558 // NOTICE: Update check page might incorrectly report Firefox ESR as out-of-date
559 user_pref("app.update.enabled",                 true);
560
561 // PREF: Enable blocking reported web forgeries
562 // https://wiki.mozilla.org/Security/Safe_Browsing
563 // http://kb.mozillazine.org/Safe_browsing
564 // https://support.mozilla.org/en-US/kb/how-does-phishing-and-malware-protection-work
565 // http://forums.mozillazine.org/viewtopic.php?f=39&t=2711237&p=12896849#p12896849
566 // CIS 2.3.4
567 user_pref("browser.safebrowsing.enabled",                       true); // Firefox < 50
568 user_pref("browser.safebrowsing.phishing.enabled",              true); // firefox >= 50
569
570 // PREF: Enable blocking reported attack sites
571 // http://kb.mozillazine.org/Browser.safebrowsing.malware.enabled
572 // CIS 2.3.5
573 user_pref("browser.safebrowsing.malware.enabled",               true);
574
575 // PREF: Disable querying Google Application Reputation database for downloaded binary files
576 // https://www.mozilla.org/en-US/firefox/39.0/releasenotes/
577 // https://wiki.mozilla.org/Security/Application_Reputation
578 user_pref("browser.safebrowsing.downloads.remote.enabled",      false);
579
580 // PREF: Disable Pocket
581 // https://support.mozilla.org/en-US/kb/save-web-pages-later-pocket-firefox
582 // https://github.com/pyllyukko/user.js/issues/143
583 user_pref("browser.pocket.enabled",                             false);
584 user_pref("extensions.pocket.enabled",                          false);
585
586 // PREF: Disable SHIELD
587 // https://support.mozilla.org/en-US/kb/shield
588 // https://bugzilla.mozilla.org/show_bug.cgi?id=1370801
589 user_pref("extensions.shield-recipe-client.enabled",            false);
590 user_pref("app.shield.optoutstudies.enabled",                   false);
591
592 // PREF: Disable "Recommended by Pocket" in Firefox Quantum
593 user_pref("browser.newtabpage.activity-stream.feeds.section.topstories",        false);
594
595 /******************************************************************************
596  * SECTION: Automatic connections                                             *
597  ******************************************************************************/
598
599 // PREF: Limit the connection keep-alive timeout to 15 seconds (disabled)
600 // https://github.com/pyllyukko/user.js/issues/387
601 // http://kb.mozillazine.org/Network.http.keep-alive.timeout
602 // https://httpd.apache.org/docs/current/mod/core.html#keepalivetimeout
603 //user_pref("network.http.keep-alive.timeout",                  15);
604
605 // PREF: Disable prefetching of <link rel="next"> URLs
606 // http://kb.mozillazine.org/Network.prefetch-next
607 // https://developer.mozilla.org/en-US/docs/Web/HTTP/Link_prefetching_FAQ#Is_there_a_preference_to_disable_link_prefetching.3F
608 user_pref("network.prefetch-next",                              false);
609
610 // PREF: Disable DNS prefetching
611 // http://kb.mozillazine.org/Network.dns.disablePrefetch
612 // https://developer.mozilla.org/en-US/docs/Web/HTTP/Controlling_DNS_prefetching
613 user_pref("network.dns.disablePrefetch",                        true);
614 user_pref("network.dns.disablePrefetchFromHTTPS",               true);
615
616 // PREF: Disable the predictive service (Necko)
617 // https://wiki.mozilla.org/Privacy/Reviews/Necko
618 user_pref("network.predictor.enabled",                          false);
619
620 // PREF: Reject .onion hostnames before passing the to DNS
621 // https://bugzilla.mozilla.org/show_bug.cgi?id=1228457
622 // RFC 7686
623 user_pref("network.dns.blockDotOnion",                          true);
624
625 // PREF: Disable search suggestions in the search bar
626 // http://kb.mozillazine.org/Browser.search.suggest.enabled
627 user_pref("browser.search.suggest.enabled",                     false);
628
629 // PREF: Disable "Show search suggestions in location bar results"
630 user_pref("browser.urlbar.suggest.searches",                    false);
631 // PREF: When using the location bar, don't suggest URLs from browsing history
632 user_pref("browser.urlbar.suggest.history",                     false);
633
634 // PREF: Disable SSDP
635 // https://bugzilla.mozilla.org/show_bug.cgi?id=1111967
636 user_pref("browser.casting.enabled",                            false);
637
638 // PREF: Disable automatic downloading of OpenH264 codec
639 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_media-capabilities
640 // https://andreasgal.com/2014/10/14/openh264-now-in-firefox/
641 user_pref("media.gmp-gmpopenh264.enabled",                      false);
642 user_pref("media.gmp-manager.url",                              "");
643
644 // PREF: Disable speculative pre-connections
645 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_speculative-pre-connections
646 // https://bugzilla.mozilla.org/show_bug.cgi?id=814169
647 user_pref("network.http.speculative-parallel-limit",            0);
648
649 // PREF: Disable downloading homepage snippets/messages from Mozilla
650 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_mozilla-content
651 // https://wiki.mozilla.org/Firefox/Projects/Firefox_Start/Snippet_Service
652 user_pref("browser.aboutHomeSnippets.updateUrl",                "");
653
654 // PREF: Never check updates for search engines
655 // https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections#w_auto-update-checking
656 user_pref("browser.search.update",                              false);
657
658 // PREF: Disable automatic captive portal detection (Firefox >= 52.0)
659 // https://support.mozilla.org/en-US/questions/1157121
660 user_pref("network.captive-portal-service.enabled",             false);
661
662 /******************************************************************************
663  * SECTION: HTTP                                                              *
664  ******************************************************************************/
665
666 // PREF: Disallow NTLMv1
667 // https://bugzilla.mozilla.org/show_bug.cgi?id=828183
668 user_pref("network.negotiate-auth.allow-insecure-ntlm-v1",      false);
669 // it is still allowed through HTTPS. uncomment the following to disable it completely.
670 //user_pref("network.negotiate-auth.allow-insecure-ntlm-v1-https",              false);
671
672 // PREF: Enable CSP 1.1 script-nonce directive support
673 // https://bugzilla.mozilla.org/show_bug.cgi?id=855326
674 user_pref("security.csp.experimentalEnabled",                   true);
675
676 // PREF: Enable Content Security Policy (CSP)
677 // https://developer.mozilla.org/en-US/docs/Web/Security/CSP/Introducing_Content_Security_Policy
678 // https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
679 user_pref("security.csp.enable",                                true);
680
681 // PREF: Enable Subresource Integrity
682 // https://developer.mozilla.org/en-US/docs/Web/Security/Subresource_Integrity
683 // https://wiki.mozilla.org/Security/Subresource_Integrity
684 user_pref("security.sri.enable",                                true);
685
686 // PREF: DNT HTTP header (disabled)
687 // https://www.mozilla.org/en-US/firefox/dnt/
688 // https://en.wikipedia.org/wiki/Do_not_track_header
689 // https://dnt-dashboard.mozilla.org
690 // https://github.com/pyllyukko/user.js/issues/11
691 // NOTICE: Do No Track must be enabled manually
692 //user_pref("privacy.donottrackheader.enabled",         true);
693
694 // PREF: Send a referer header with the target URI as the source
695 // https://bugzilla.mozilla.org/show_bug.cgi?id=822869
696 // https://github.com/pyllyukko/user.js/issues/227
697 // NOTICE: Spoofing referers breaks functionality on websites relying on authentic referer headers
698 // NOTICE: Spoofing referers breaks visualisation of 3rd-party sites on the Lightbeam addon
699 // NOTICE: Spoofing referers disables CSRF protection on some login pages not implementing origin-header/cookie+token based CSRF protection
700 // TODO: https://github.com/pyllyukko/user.js/issues/94, commented-out XOriginPolicy/XOriginTrimmingPolicy = 2 prefs
701 user_pref("network.http.referer.spoofSource",                   true);
702
703 // PREF: Don't send referer headers when following links across different domains (disabled)
704 // https://github.com/pyllyukko/user.js/issues/227
705 // user_pref("network.http.referer.XOriginPolicy",              2);
706
707 // PREF: Accept Only 1st Party Cookies
708 // http://kb.mozillazine.org/Network.cookie.cookieBehavior#1
709 // NOTICE: Blocking 3rd-party cookies breaks a number of payment gateways
710 // CIS 2.5.1
711 user_pref("network.cookie.cookieBehavior",                      1);
712
713 // PREF: Enable first-party isolation
714 // https://bugzilla.mozilla.org/show_bug.cgi?id=1299996
715 // https://bugzilla.mozilla.org/show_bug.cgi?id=1260931
716 // https://wiki.mozilla.org/Security/FirstPartyIsolation
717 user_pref("privacy.firstparty.isolate",                         true);
718
719 // PREF: Make sure that third-party cookies (if enabled) never persist beyond the session.
720 // https://feeding.cloud.geek.nz/posts/tweaking-cookies-for-privacy-in-firefox/
721 // http://kb.mozillazine.org/Network.cookie.thirdparty.sessionOnly
722 // https://developer.mozilla.org/en-US/docs/Cookies_Preferences_in_Mozilla#network.cookie.thirdparty.sessionOnly
723 user_pref("network.cookie.thirdparty.sessionOnly",              true);
724
725 // PREF: Spoof User-agent (disabled)
726 //user_pref("general.useragent.override",                               "Mozilla/5.0 (Windows NT 6.1; rv:45.0) Gecko/20100101 Firefox/45.0");
727 //user_pref("general.appname.override",                         "Netscape");
728 //user_pref("general.appversion.override",                      "5.0 (Windows)");
729 //user_pref("general.platform.override",                                "Win32");
730 //user_pref("general.oscpu.override",                           "Windows NT 6.1");
731
732 /*******************************************************************************
733  * SECTION: Caching                                                            *
734  ******************************************************************************/
735
736 // PREF: Permanently enable private browsing mode
737 // https://support.mozilla.org/en-US/kb/Private-Browsing
738 // https://wiki.mozilla.org/PrivateBrowsing
739 // NOTICE: You can not view or inspect cookies when in private browsing: https://bugzilla.mozilla.org/show_bug.cgi?id=823941
740 // NOTICE: When Javascript is enabled, Websites can detect use of Private Browsing mode
741 // NOTICE: Private browsing breaks Kerberos authentication
742 // NOTICE: Disables "Containers" functionality (see below)
743 // 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
744 user_pref("browser.privatebrowsing.autostart",                  true);
745
746 // PREF: Do not download URLs for the offline cache
747 // http://kb.mozillazine.org/Browser.cache.offline.enable
748 user_pref("browser.cache.offline.enable",                       false);
749
750 // PREF: Clear history when Firefox closes
751 // https://support.mozilla.org/en-US/kb/Clear%20Recent%20History#w_how-do-i-make-firefox-clear-my-history-automatically
752 // NOTICE: Installing user.js will remove your browsing history, caches and local storage.
753 // NOTICE: Installing user.js **will remove your saved passwords** (https://github.com/pyllyukko/user.js/issues/27)
754 // NOTICE: Clearing open windows on Firefox exit causes 2 windows to open when Firefox starts https://bugzilla.mozilla.org/show_bug.cgi?id=1334945
755 user_pref("privacy.sanitize.sanitizeOnShutdown",                true);
756 user_pref("privacy.clearOnShutdown.cache",                      true);
757 user_pref("privacy.clearOnShutdown.cookies",                    true);
758 user_pref("privacy.clearOnShutdown.downloads",                  true);
759 user_pref("privacy.clearOnShutdown.formdata",                   true);
760 user_pref("privacy.clearOnShutdown.history",                    true);
761 user_pref("privacy.clearOnShutdown.offlineApps",                true);
762 user_pref("privacy.clearOnShutdown.sessions",                   true);
763 user_pref("privacy.clearOnShutdown.openWindows",                true);
764
765 // PREF: Set time range to "Everything" as default in "Clear Recent History"
766 user_pref("privacy.sanitize.timeSpan",                          0);
767
768 // PREF: Clear everything but "Site Preferences" in "Clear Recent History"
769 user_pref("privacy.cpd.offlineApps",                            true);
770 user_pref("privacy.cpd.cache",                                  true);
771 user_pref("privacy.cpd.cookies",                                true);
772 user_pref("privacy.cpd.downloads",                              true);
773 user_pref("privacy.cpd.formdata",                               true);
774 user_pref("privacy.cpd.history",                                true);
775 user_pref("privacy.cpd.sessions",                               true);
776
777 // PREF: Don't remember browsing history
778 user_pref("places.history.enabled",                             false);
779
780 // PREF: Disable disk cache
781 // http://kb.mozillazine.org/Browser.cache.disk.enable
782 user_pref("browser.cache.disk.enable",                          false);
783
784 // PREF: Disable memory cache (disabled)
785 // http://kb.mozillazine.org/Browser.cache.memory.enable
786 //user_pref("browser.cache.memory.enable",              false);
787
788 // PREF: Disable Caching of SSL Pages
789 // CIS Version 1.2.0 October 21st, 2011 2.5.8
790 // http://kb.mozillazine.org/Browser.cache.disk_cache_ssl
791 user_pref("browser.cache.disk_cache_ssl",                       false);
792
793 // PREF: Disable download history
794 // CIS Version 1.2.0 October 21st, 2011 2.5.5
795 user_pref("browser.download.manager.retention",                 0);
796
797 // PREF: Disable password manager
798 // CIS Version 1.2.0 October 21st, 2011 2.5.2
799 user_pref("signon.rememberSignons",                             false);
800
801 // PREF: Disable form autofill, don't save information entered in web page forms and the Search Bar
802 user_pref("browser.formfill.enable",                            false);
803
804 // PREF: Cookies expires at the end of the session (when the browser closes)
805 // http://kb.mozillazine.org/Network.cookie.lifetimePolicy#2
806 user_pref("network.cookie.lifetimePolicy",                      2);
807
808 // PREF: Require manual intervention to autofill known username/passwords sign-in forms
809 // http://kb.mozillazine.org/Signon.autofillForms
810 // https://www.torproject.org/projects/torbrowser/design/#identifier-linkability
811 user_pref("signon.autofillForms",                               false);
812
813 // PREF: Disable formless login capture
814 // https://bugzilla.mozilla.org/show_bug.cgi?id=1166947
815 user_pref("signon.formlessCapture.enabled",                     false);
816
817 // PREF: When username/password autofill is enabled, still disable it on non-HTTPS sites
818 // https://hg.mozilla.org/integration/mozilla-inbound/rev/f0d146fe7317
819 user_pref("signon.autofillForms.http",                          false);
820
821 // PREF: Show in-content login form warning UI for insecure login fields
822 // https://hg.mozilla.org/integration/mozilla-inbound/rev/f0d146fe7317
823 user_pref("security.insecure_field_warning.contextual.enabled", true);
824
825 // PREF: Disable the password manager for pages with autocomplete=off (disabled)
826 // https://bugzilla.mozilla.org/show_bug.cgi?id=956906
827 // OWASP ASVS V9.1
828 // Does not prevent any kind of auto-completion (see browser.formfill.enable, signon.autofillForms)
829 //user_pref("signon.storeWhenAutocompleteOff",                  false);
830
831 // PREF: Delete Search and Form History
832 // CIS Version 1.2.0 October 21st, 2011 2.5.6
833 user_pref("browser.formfill.expire_days",                       0);
834
835 // PREF: Clear SSL Form Session Data
836 // http://kb.mozillazine.org/Browser.sessionstore.privacy_level#2
837 // Store extra session data for unencrypted (non-HTTPS) sites only.
838 // CIS Version 1.2.0 October 21st, 2011 2.5.7
839 // NOTE: CIS says 1, we use 2
840 user_pref("browser.sessionstore.privacy_level",                 2);
841
842 // PREF: Delete temporary files on exit
843 // https://bugzilla.mozilla.org/show_bug.cgi?id=238789
844 user_pref("browser.helperApps.deleteTempFileOnExit",            true);
845
846 // PREF: Do not create screenshots of visited pages (relates to the "new tab page" feature)
847 // https://support.mozilla.org/en-US/questions/973320
848 // https://developer.mozilla.org/en-US/docs/Mozilla/Preferences/Preference_reference/browser.pagethumbnails.capturing_disabled
849 user_pref("browser.pagethumbnails.capturing_disabled",          true);
850
851 // PREF: Don't fetch and permanently store favicons for Windows .URL shortcuts created by drag and drop
852 // NOTICE: .URL shortcut files will be created with a generic icon
853 // Favicons are stored as .ico files in $profile_dir\shortcutCache
854 user_pref("browser.shell.shortcutFavicons",                                     false);
855
856 // PREF: Disable bookmarks backups (default: 15)
857 // http://kb.mozillazine.org/Browser.bookmarks.max_backups
858 user_pref("browser.bookmarks.max_backups", 0);
859
860 /*******************************************************************************
861  * SECTION: UI related                                                         *
862  *******************************************************************************/
863
864 // PREF: Enable insecure password warnings (login forms in non-HTTPS pages)
865 // https://blog.mozilla.org/tanvi/2016/01/28/no-more-passwords-over-http-please/
866 // https://bugzilla.mozilla.org/show_bug.cgi?id=1319119
867 // https://bugzilla.mozilla.org/show_bug.cgi?id=1217156
868 user_pref("security.insecure_password.ui.enabled",              true);
869
870 // PREF: Disable right-click menu manipulation via JavaScript (disabled)
871 //user_pref("dom.event.contextmenu.enabled",            false);
872
873 // PREF: Disable "Are you sure you want to leave this page?" popups on page close
874 // https://support.mozilla.org/en-US/questions/1043508
875 // Does not prevent JS leaks of the page close event.
876 // https://developer.mozilla.org/en-US/docs/Web/Events/beforeunload
877 //user_pref("dom.disable_beforeunload",    true);
878
879 // PREF: Disable Downloading on Desktop
880 // CIS 2.3.2
881 user_pref("browser.download.folderList",                        2);
882
883 // PREF: Always ask the user where to download
884 // https://developer.mozilla.org/en/Download_Manager_preferences (obsolete)
885 user_pref("browser.download.useDownloadDir",                    false);
886
887 // PREF: Disable the "new tab page" feature and show a blank tab instead
888 // https://wiki.mozilla.org/Privacy/Reviews/New_Tab
889 // 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
890 user_pref("browser.newtabpage.enabled",                         false);
891 user_pref("browser.newtab.url",                                 "about:blank");
892
893 // PREF: Disable Activity Stream
894 // https://wiki.mozilla.org/Firefox/Activity_Stream
895 user_pref("browser.newtabpage.activity-stream.enabled",         false);
896
897 // PREF: Disable new tab tile ads & preload
898 // http://www.thewindowsclub.com/disable-remove-ad-tiles-from-firefox
899 // http://forums.mozillazine.org/viewtopic.php?p=13876331#p13876331
900 // https://wiki.mozilla.org/Tiles/Technical_Documentation#Ping
901 // https://gecko.readthedocs.org/en/latest/browser/browser/DirectoryLinksProvider.html#browser-newtabpage-directory-source
902 // https://gecko.readthedocs.org/en/latest/browser/browser/DirectoryLinksProvider.html#browser-newtabpage-directory-ping
903 // TODO: deprecated? not in DXR, some dead links
904 user_pref("browser.newtabpage.enhanced",                        false);
905 user_pref("browser.newtab.preload",                             false);
906 user_pref("browser.newtabpage.directory.ping",                  "");
907 user_pref("browser.newtabpage.directory.source",                "data:text/plain,{}");
908
909 // PREF: Enable Auto Notification of Outdated Plugins (Firefox < 50)
910 // https://wiki.mozilla.org/Firefox3.6/Plugin_Update_Awareness_Security_Review
911 // CIS Version 1.2.0 October 21st, 2011 2.1.2
912 // https://hg.mozilla.org/mozilla-central/rev/304560
913 user_pref("plugins.update.notifyUser",                          true);
914
915 // PREF: Force Punycode for Internationalized Domain Names
916 // http://kb.mozillazine.org/Network.IDN_show_punycode
917 // https://www.xudongz.com/blog/2017/idn-phishing/
918 // https://wiki.mozilla.org/IDN_Display_Algorithm
919 // https://en.wikipedia.org/wiki/IDN_homograph_attack
920 // https://www.mozilla.org/en-US/security/advisories/mfsa2017-02/
921 // CIS Mozilla Firefox 24 ESR v1.0.0 - 3.6
922 user_pref("network.IDN_show_punycode",                          true);
923
924 // PREF: Disable inline autocomplete in URL bar
925 // http://kb.mozillazine.org/Inline_autocomplete
926 user_pref("browser.urlbar.autoFill",                            false);
927 user_pref("browser.urlbar.autoFill.typed",                      false);
928
929 // PREF: Disable CSS :visited selectors
930 // https://blog.mozilla.org/security/2010/03/31/plugging-the-css-history-leak/
931 // https://dbaron.org/mozilla/visited-privacy
932 user_pref("layout.css.visited_links_enabled",                   false);
933
934 // PREF: Disable URL bar autocomplete and history/bookmarks suggestions dropdown
935 // http://kb.mozillazine.org/Disabling_autocomplete_-_Firefox#Firefox_3.5
936 user_pref("browser.urlbar.autocomplete.enabled",                false);
937
938 // PREF: Do not check if Firefox is the default browser
939 user_pref("browser.shell.checkDefaultBrowser",                  false);
940
941 // PREF: When password manager is enabled, lock the password storage periodically
942 // CIS Version 1.2.0 October 21st, 2011 2.5.3 Disable Prompting for Credential Storage
943 user_pref("security.ask_for_password",                          2);
944
945 // PREF: Lock the password storage every 1 minutes (default: 30)
946 user_pref("security.password_lifetime",                         1);
947
948 // PREF: Display a notification bar when websites offer data for offline use
949 // http://kb.mozillazine.org/Browser.offline-apps.notify
950 user_pref("browser.offline-apps.notify",                        true);
951
952 /******************************************************************************
953  * SECTION: Cryptography                                                      *
954  ******************************************************************************/
955
956 // PREF: Enable HSTS preload list (pre-set HSTS sites list provided by Mozilla)
957 // https://blog.mozilla.org/security/2012/11/01/preloading-hsts/
958 // https://wiki.mozilla.org/Privacy/Features/HSTS_Preload_List
959 // https://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security
960 user_pref("network.stricttransportsecurity.preloadlist",        true);
961
962 // PREF: Enable Online Certificate Status Protocol
963 // https://en.wikipedia.org/wiki/Online_Certificate_Status_Protocol
964 // https://www.imperialviolet.org/2014/04/19/revchecking.html
965 // https://www.maikel.pro/blog/current-state-certificate-revocation-crls-ocsp/
966 // https://wiki.mozilla.org/CA:RevocationPlan
967 // https://wiki.mozilla.org/CA:ImprovingRevocation
968 // https://wiki.mozilla.org/CA:OCSP-HardFail
969 // https://news.netcraft.com/archives/2014/04/24/certificate-revocation-why-browsers-remain-affected-by-heartbleed.html
970 // https://news.netcraft.com/archives/2013/04/16/certificate-revocation-and-the-performance-of-ocsp.html
971 // NOTICE: OCSP leaks your IP and domains you visit to the CA when OCSP Stapling is not available on visited host
972 // NOTICE: OCSP is vulnerable to replay attacks when nonce is not configured on the OCSP responder
973 // NOTICE: OCSP adds latency (performance)
974 // NOTICE: Short-lived certificates are not checked for revocation (security.pki.cert_short_lifetime_in_days, default:10)
975 // CIS Version 1.2.0 October 21st, 2011 2.2.4
976 user_pref("security.OCSP.enabled",                              1);
977
978 // PREF: Enable OCSP Stapling support
979 // https://en.wikipedia.org/wiki/OCSP_stapling
980 // https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
981 // https://www.digitalocean.com/community/tutorials/how-to-configure-ocsp-stapling-on-apache-and-nginx
982 user_pref("security.ssl.enable_ocsp_stapling",                  true);
983
984 // PREF: Enable OCSP Must-Staple support (Firefox >= 45)
985 // https://blog.mozilla.org/security/2015/11/23/improving-revocation-ocsp-must-staple-and-short-lived-certificates/
986 // https://www.entrust.com/ocsp-must-staple/
987 // https://github.com/schomery/privacy-settings/issues/40
988 // NOTICE: Firefox falls back on plain OCSP when must-staple is not configured on the host certificate
989 user_pref("security.ssl.enable_ocsp_must_staple",               true);
990
991 // PREF: Require a valid OCSP response for OCSP enabled certificates
992 // https://groups.google.com/forum/#!topic/mozilla.dev.security/n1G-N2-HTVA
993 // Disabling this will make OCSP bypassable by MitM attacks suppressing OCSP responses
994 // NOTICE: `security.OCSP.require` will make the connection fail when the OCSP responder is unavailable
995 // NOTICE: `security.OCSP.require` is known to break browsing on some [captive portals](https://en.wikipedia.org/wiki/Captive_portal)
996 user_pref("security.OCSP.require",                              true);
997
998 // PREF: Disable TLS Session Tickets
999 // https://www.blackhat.com/us-13/briefings.html#NextGen
1000 // https://media.blackhat.com/us-13/US-13-Daigniere-TLS-Secrets-Slides.pdf
1001 // https://media.blackhat.com/us-13/US-13-Daigniere-TLS-Secrets-WP.pdf
1002 // https://bugzilla.mozilla.org/show_bug.cgi?id=917049
1003 // https://bugzilla.mozilla.org/show_bug.cgi?id=967977
1004 user_pref("security.ssl.disable_session_identifiers",           true);
1005
1006 // PREF: Only allow TLS 1.[0-3]
1007 // http://kb.mozillazine.org/Security.tls.version.*
1008 // 1 = TLS 1.0 is the minimum required / maximum supported encryption protocol. (This is the current default for the maximum supported version.)
1009 // 2 = TLS 1.1 is the minimum required / maximum supported encryption protocol.
1010 user_pref("security.tls.version.min",                           1);
1011 user_pref("security.tls.version.max",                           4);
1012
1013 // PREF: Disable insecure TLS version fallback
1014 // https://bugzilla.mozilla.org/show_bug.cgi?id=1084025
1015 // https://github.com/pyllyukko/user.js/pull/206#issuecomment-280229645
1016 user_pref("security.tls.version.fallback-limit",                3);
1017
1018 // PREF: Enfore Public Key Pinning
1019 // https://en.wikipedia.org/wiki/HTTP_Public_Key_Pinning
1020 // https://wiki.mozilla.org/SecurityEngineering/Public_Key_Pinning
1021 // "2. Strict. Pinning is always enforced."
1022 user_pref("security.cert_pinning.enforcement_level",            2);
1023
1024 // PREF: Disallow SHA-1
1025 // https://bugzilla.mozilla.org/show_bug.cgi?id=1302140
1026 // https://shattered.io/
1027 user_pref("security.pki.sha1_enforcement_level",                1);
1028
1029 // PREF: Warn the user when server doesn't support RFC 5746 ("safe" renegotiation)
1030 // https://wiki.mozilla.org/Security:Renegotiation#security.ssl.treat_unsafe_negotiation_as_broken
1031 // https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-3555
1032 user_pref("security.ssl.treat_unsafe_negotiation_as_broken",    true);
1033
1034 // PREF: Disallow connection to servers not supporting safe renegotiation (disabled)
1035 // https://wiki.mozilla.org/Security:Renegotiation#security.ssl.require_safe_negotiation
1036 // https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-3555
1037 // 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
1038 //user_pref("security.ssl.require_safe_negotiation",            true);
1039
1040 // PREF: Disable automatic reporting of TLS connection errors
1041 // https://support.mozilla.org/en-US/kb/certificate-pinning-reports
1042 // we could also disable security.ssl.errorReporting.enabled, but I think it's
1043 // good to leave the option to report potentially malicious sites if the user
1044 // chooses to do so.
1045 // you can test this at https://pinningtest.appspot.com/
1046 user_pref("security.ssl.errorReporting.automatic",              false);
1047
1048 // PREF: Pre-populate the current URL but do not pre-fetch the certificate in the "Add Security Exception" dialog
1049 // http://kb.mozillazine.org/Browser.ssl_override_behavior
1050 // https://github.com/pyllyukko/user.js/issues/210
1051 user_pref("browser.ssl_override_behavior",                      1);
1052
1053 /******************************************************************************
1054  * SECTION: Cipher suites                                                     *
1055  ******************************************************************************/
1056
1057 // PREF: Disable null ciphers
1058 user_pref("security.ssl3.rsa_null_sha",                         false);
1059 user_pref("security.ssl3.rsa_null_md5",                         false);
1060 user_pref("security.ssl3.ecdhe_rsa_null_sha",                   false);
1061 user_pref("security.ssl3.ecdhe_ecdsa_null_sha",                 false);
1062 user_pref("security.ssl3.ecdh_rsa_null_sha",                    false);
1063 user_pref("security.ssl3.ecdh_ecdsa_null_sha",                  false);
1064
1065 // PREF: Disable SEED cipher
1066 // https://en.wikipedia.org/wiki/SEED
1067 user_pref("security.ssl3.rsa_seed_sha",                         false);
1068
1069 // PREF: Disable 40/56/128-bit ciphers
1070 // 40-bit ciphers
1071 user_pref("security.ssl3.rsa_rc4_40_md5",                       false);
1072 user_pref("security.ssl3.rsa_rc2_40_md5",                       false);
1073 // 56-bit ciphers
1074 user_pref("security.ssl3.rsa_1024_rc4_56_sha",                  false);
1075 // 128-bit ciphers
1076 user_pref("security.ssl3.rsa_camellia_128_sha",                 false);
1077 user_pref("security.ssl3.ecdhe_rsa_aes_128_sha",                false);
1078 user_pref("security.ssl3.ecdhe_ecdsa_aes_128_sha",              false);
1079 user_pref("security.ssl3.ecdh_rsa_aes_128_sha",                 false);
1080 user_pref("security.ssl3.ecdh_ecdsa_aes_128_sha",               false);
1081 user_pref("security.ssl3.dhe_rsa_camellia_128_sha",             false);
1082 user_pref("security.ssl3.dhe_rsa_aes_128_sha",                  false);
1083
1084 // PREF: Disable RC4
1085 // https://developer.mozilla.org/en-US/Firefox/Releases/38#Security
1086 // https://bugzilla.mozilla.org/show_bug.cgi?id=1138882
1087 // https://rc4.io/
1088 // https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-2566
1089 user_pref("security.ssl3.ecdh_ecdsa_rc4_128_sha",               false);
1090 user_pref("security.ssl3.ecdh_rsa_rc4_128_sha",                 false);
1091 user_pref("security.ssl3.ecdhe_ecdsa_rc4_128_sha",              false);
1092 user_pref("security.ssl3.ecdhe_rsa_rc4_128_sha",                false);
1093 user_pref("security.ssl3.rsa_rc4_128_md5",                      false);
1094 user_pref("security.ssl3.rsa_rc4_128_sha",                      false);
1095 user_pref("security.tls.unrestricted_rc4_fallback",             false);
1096
1097 // PREF: Disable 3DES (effective key size is < 128)
1098 // https://en.wikipedia.org/wiki/3des#Security
1099 // http://en.citizendium.org/wiki/Meet-in-the-middle_attack
1100 // http://www-archive.mozilla.org/projects/security/pki/nss/ssl/fips-ssl-ciphersuites.html
1101 user_pref("security.ssl3.dhe_dss_des_ede3_sha",                 false);
1102 user_pref("security.ssl3.dhe_rsa_des_ede3_sha",                 false);
1103 user_pref("security.ssl3.ecdh_ecdsa_des_ede3_sha",              false);
1104 user_pref("security.ssl3.ecdh_rsa_des_ede3_sha",                false);
1105 user_pref("security.ssl3.ecdhe_ecdsa_des_ede3_sha",             false);
1106 user_pref("security.ssl3.ecdhe_rsa_des_ede3_sha",               false);
1107 user_pref("security.ssl3.rsa_des_ede3_sha",                     false);
1108 user_pref("security.ssl3.rsa_fips_des_ede3_sha",                false);
1109
1110 // PREF: Disable ciphers with ECDH (non-ephemeral)
1111 user_pref("security.ssl3.ecdh_rsa_aes_256_sha",                 false);
1112 user_pref("security.ssl3.ecdh_ecdsa_aes_256_sha",               false);
1113
1114 // PREF: Disable 256 bits ciphers without PFS
1115 user_pref("security.ssl3.rsa_camellia_256_sha",                 false);
1116
1117 // PREF: Enable ciphers with ECDHE and key size > 128bits
1118 user_pref("security.ssl3.ecdhe_rsa_aes_256_sha",                true); // 0xc014
1119 user_pref("security.ssl3.ecdhe_ecdsa_aes_256_sha",              true); // 0xc00a
1120
1121 // PREF: Enable GCM ciphers (TLSv1.2 only)
1122 // https://en.wikipedia.org/wiki/Galois/Counter_Mode
1123 user_pref("security.ssl3.ecdhe_ecdsa_aes_128_gcm_sha256",       true); // 0xc02b
1124 user_pref("security.ssl3.ecdhe_rsa_aes_128_gcm_sha256",         true); // 0xc02f
1125
1126 // PREF: Enable ChaCha20 and Poly1305 (Firefox >= 47)
1127 // https://www.mozilla.org/en-US/firefox/47.0/releasenotes/
1128 // https://tools.ietf.org/html/rfc7905
1129 // https://bugzilla.mozilla.org/show_bug.cgi?id=917571
1130 // https://bugzilla.mozilla.org/show_bug.cgi?id=1247860
1131 // https://cr.yp.to/chacha.html
1132 user_pref("security.ssl3.ecdhe_ecdsa_chacha20_poly1305_sha256", true);
1133 user_pref("security.ssl3.ecdhe_rsa_chacha20_poly1305_sha256",   true);
1134
1135 // PREF: Disable ciphers susceptible to the logjam attack
1136 // https://weakdh.org/
1137 user_pref("security.ssl3.dhe_rsa_camellia_256_sha",             false);
1138 user_pref("security.ssl3.dhe_rsa_aes_256_sha",                  false);
1139
1140 // PREF: Disable ciphers with DSA (max 1024 bits)
1141 user_pref("security.ssl3.dhe_dss_aes_128_sha",                  false);
1142 user_pref("security.ssl3.dhe_dss_aes_256_sha",                  false);
1143 user_pref("security.ssl3.dhe_dss_camellia_128_sha",             false);
1144 user_pref("security.ssl3.dhe_dss_camellia_256_sha",             false);
1145
1146 // PREF: Fallbacks due compatibility reasons
1147 user_pref("security.ssl3.rsa_aes_256_sha",                      true); // 0x35
1148 user_pref("security.ssl3.rsa_aes_128_sha",                      true); // 0x2f