-
Notifications
You must be signed in to change notification settings - Fork 32
/
Copy pathuser.js
1411 lines (1356 loc) · 85.7 KB
/
user.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/******
* name: arkenfox user.js
* date: 24 November 2021
* version 95-alpha
* url: https://github.com/arkenfox/user.js
* license: MIT: https://github.com/arkenfox/user.js/blob/master/LICENSE.txt
* README:
1. Consider using Tor Browser if it meets your needs or fits your threat model
* https://www.torproject.org/about/torusers.html.en
2. Required reading: Overview, Backing Up, Implementing, and Maintenance entries
* https://github.com/arkenfox/user.js/wiki
3. If you skipped step 2, return to step 2
4. Make changes
* There are often trade-offs and conflicts between security vs privacy vs anti-tracking
and these need to be balanced against functionality & convenience & breakage
* Some site breakage and unintended consequences will happen. Everyone's experience will differ
e.g. some user data is erased on exit (section 2800), change this to suit your needs
* While not 100% definitive, search for "[SETUP" tags
e.g. third party images/videos not loading on some sites? check 1601
* Take the wiki link in step 2 and read the Troubleshooting entry
5. Some tag info
[SETUP-SECURITY] it's one item, read it
[SETUP-WEB] can cause some websites to break
[SETUP-CHROME] changes how Firefox itself behaves (i.e. not directly website related)
6. Override Recipes: https://github.com/arkenfox/user.js/issues/1080
* RELEASES: https://github.com/arkenfox/user.js/releases
* It is best to use the arkenfox release that is optimized for and matches your Firefox version
* EVERYONE: each release
- run prefsCleaner to reset prefs made inactive, including deprecated (9999s)
ESR91
- If you are not using arkenfox v91... (not a definitive list)
- 9999: switch the appropriate deprecated section(s) back on
* INDEX:
0100: STARTUP
0200: GEOLOCATION / LANGUAGE / LOCALE
0300: QUIETER FOX
0400: SAFE BROWSING
0600: BLOCK IMPLICIT OUTBOUND
0700: DNS / DoH / PROXY / SOCKS / IPv6
0800: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS
0900: PASSWORDS
1000: DISK AVOIDANCE
1200: HTTPS (SSL/TLS / OCSP / CERTS / HPKP)
1400: FONTS
1600: HEADERS / REFERERS
1700: CONTAINERS
2000: PLUGINS / MEDIA / WEBRTC
2300: WEB WORKERS
2400: DOM (DOCUMENT OBJECT MODEL)
2600: MISCELLANEOUS
2700: PERSISTENT STORAGE
2800: SHUTDOWN & SANITIZING
4000: FPI (FIRST PARTY ISOLATION)
4500: RFP (RESIST FINGERPRINTING)
5000: OPTIONAL OPSEC
5500: OPTIONAL HARDENING
6000: DON'T TOUCH
7000: DON'T BOTHER
8000: DON'T BOTHER: NON-RFP
9000: PERSONAL
9999: DEPRECATED / REMOVED / LEGACY / RENAMED
******/
/* START: internal custom pref to test for syntax errors
* [NOTE] Not all syntax errors cause parsing to abort i.e. reaching the last debug pref
* no longer necessarily means that all prefs have been applied. Check the console right
* after startup for any warnings/error messages related to non-applied prefs
* [1] https://blog.mozilla.org/nnethercote/2018/03/09/a-new-preferences-parser-for-firefox/ ***/
user_pref("_user.js.parrot", "START: Oh yes, the Norwegian Blue... what's wrong with it?");
/* 0000: disable about:config warning ***/
user_pref("browser.aboutConfig.showWarning", false);
/*** [SECTION 0100]: STARTUP ***/
user_pref("_user.js.parrot", "0100 syntax error: the parrot's dead!");
/* 0101: disable default browser check
* [SETTING] General>Startup>Always check if Firefox is your default browser ***/
user_pref("browser.shell.checkDefaultBrowser", false);
/* 0102: set startup page [SETUP-CHROME]
* 0=blank, 1=home, 2=last visited page, 3=resume previous session
* [NOTE] Session Restore is cleared with history (2811, 2812), and not used in Private Browsing mode
* [SETTING] General>Startup>Restore previous session ***/
user_pref("browser.startup.page", 0);
/* 0103: set HOME+NEWWINDOW page
* about:home=Activity Stream (default, see 0105), custom URL, about:blank
* [SETTING] Home>New Windows and Tabs>Homepage and new windows ***/
user_pref("browser.startup.homepage", "about:blank");
/* 0104: set NEWTAB page
* true=Activity Stream (default, see 0105), false=blank page
* [SETTING] Home>New Windows and Tabs>New tabs ***/
user_pref("browser.newtabpage.enabled", false);
user_pref("browser.newtab.preload", false);
/* 0105: disable some Activity Stream items
* Activity Stream is the default homepage/newtab based on metadata and browsing behavior
* [SETTING] Home>Firefox Home Content>... to show/hide what you want ***/
user_pref("browser.newtabpage.activity-stream.feeds.telemetry", false);
user_pref("browser.newtabpage.activity-stream.telemetry", false);
user_pref("browser.newtabpage.activity-stream.feeds.snippets", false); // [DEFAULT: false]
user_pref("browser.newtabpage.activity-stream.feeds.section.topstories", false);
user_pref("browser.newtabpage.activity-stream.section.highlights.includePocket", false);
user_pref("browser.newtabpage.activity-stream.showSponsored", false);
user_pref("browser.newtabpage.activity-stream.feeds.discoverystreamfeed", false); // [FF66+]
user_pref("browser.newtabpage.activity-stream.showSponsoredTopSites", false); // [FF83+]
/* 0106: clear default topsites
* [NOTE] This does not block you from adding your own ***/
user_pref("browser.newtabpage.activity-stream.default.sites", "");
/*** [SECTION 0200]: GEOLOCATION / LANGUAGE / LOCALE ***/
user_pref("_user.js.parrot", "0200 syntax error: the parrot's definitely deceased!");
/* 0201: use Mozilla geolocation service instead of Google if permission is granted [FF74+]
* Optionally enable logging to the console (defaults to false) ***/
user_pref("geo.provider.network.url", "https://location.services.mozilla.com/v1/geolocate?key=%MOZILLA_API_KEY%");
// user_pref("geo.provider.network.logging.enabled", true); // [HIDDEN PREF]
/* 0202: disable using the OS's geolocation service ***/
user_pref("geo.provider.ms-windows-location", false); // [WINDOWS]
user_pref("geo.provider.use_corelocation", false); // [MAC]
user_pref("geo.provider.use_gpsd", false); // [LINUX]
/* 0203: disable region updates
* [1] https://firefox-source-docs.mozilla.org/toolkit/modules/toolkit_modules/Region.html ***/
user_pref("browser.region.network.url", ""); // [FF78+]
user_pref("browser.region.update.enabled", false); // [FF79+]
/* 0204: set search region
* [NOTE] May not be hidden if Firefox has changed your settings due to your region (0203) ***/
// user_pref("browser.search.region", "US"); // [HIDDEN PREF]
/* 0210: set preferred language for displaying pages
* [SETTING] General>Language and Appearance>Language>Choose your preferred language...
* [TEST] https://addons.mozilla.org/about ***/
user_pref("intl.accept_languages", "en-US, en");
/* 0211: use US English locale regardless of the system locale
* [SETUP-WEB] May break some input methods e.g xim/ibus for CJK languages [1]
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=867501,1629630 ***/
user_pref("javascript.use_us_english_locale", true); // [HIDDEN PREF]
/*** [SECTION 0300]: QUIETER FOX ***/
user_pref("_user.js.parrot", "0300 syntax error: the parrot's not pinin' for the fjords!");
/** UPDATES ***/
/* 0301: disable auto-INSTALLING Firefox updates [NON-WINDOWS]
* [NOTE] You will still get prompts to update, and should do so in a timely manner
* [SETTING] General>Firefox Updates>Check for updates but let you choose to install them ***/
user_pref("app.update.auto", false);
/* 0302: disable auto-INSTALLING Firefox updates via a background service [FF90+] [WINDOWS]
* [SETTING] General>Firefox Updates>Automatically install updates>When Firefox is not running
* [1] https://support.mozilla.org/kb/enable-background-updates-firefox-windows ***/
user_pref("app.update.background.scheduling.enabled", false);
/* 0303: disable auto-CHECKING for extension and theme updates ***/
// user_pref("extensions.update.enabled", false);
/* 0304: disable auto-INSTALLING extension and theme updates (after the check in 0303)
* [SETTING] about:addons>Extensions>[cog-wheel-icon]>Update Add-ons Automatically (toggle) ***/
// user_pref("extensions.update.autoUpdateDefault", false);
/* 0305: disable extension metadata
* used when installing/updating an extension, and in daily background update checks:
* when false, extension detail tabs will have no description ***/
// user_pref("extensions.getAddons.cache.enabled", false);
/* 0306: disable search engine updates (e.g. OpenSearch)
* [NOTE] This does not affect Mozilla's built-in or Web Extension search engines ***/
user_pref("browser.search.update", false);
/** RECOMMENDATIONS ***/
/* 0320: disable recommendation pane in about:addons (uses Google Analytics) ***/
user_pref("extensions.getAddons.showPane", false); // [HIDDEN PREF]
/* 0321: disable recommendations in about:addons' Extensions and Themes panes [FF68+] ***/
user_pref("extensions.htmlaboutaddons.recommendations.enabled", false);
/* 0322: disable personalized Extension Recommendations in about:addons and AMO [FF65+]
* [NOTE] This pref has no effect when Health Reports (0331) are disabled
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to make personalized extension recommendations
* [1] https://support.mozilla.org/kb/personalized-extension-recommendations ***/
user_pref("browser.discovery.enabled", false);
/** TELEMETRY ***/
/* 0330: disable new data submission [FF41+]
* If disabled, no policy is shown or upload takes place, ever
* [1] https://bugzilla.mozilla.org/1195552 ***/
user_pref("datareporting.policy.dataSubmissionEnabled", false);
/* 0331: disable Health Reports
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send technical... data ***/
user_pref("datareporting.healthreport.uploadEnabled", false);
/* 0332: disable telemetry
* The "unified" pref affects the behaviour of the "enabled" pref
* - If "unified" is false then "enabled" controls the telemetry module
* - If "unified" is true then "enabled" only controls whether to record extended data
* [NOTE] "toolkit.telemetry.enabled" is now LOCKED to reflect prerelease (true) or release builds (false) [2]
* [1] https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/internals/preferences.html
* [2] https://medium.com/georg-fritzsche/data-preference-changes-in-firefox-58-2d5df9c428b5 ***/
user_pref("toolkit.telemetry.unified", false);
user_pref("toolkit.telemetry.enabled", false); // see [NOTE]
user_pref("toolkit.telemetry.server", "data:,");
user_pref("toolkit.telemetry.archive.enabled", false);
user_pref("toolkit.telemetry.newProfilePing.enabled", false); // [FF55+]
user_pref("toolkit.telemetry.shutdownPingSender.enabled", false); // [FF55+]
user_pref("toolkit.telemetry.updatePing.enabled", false); // [FF56+]
user_pref("toolkit.telemetry.bhrPing.enabled", false); // [FF57+] Background Hang Reporter
user_pref("toolkit.telemetry.firstShutdownPing.enabled", false); // [FF57+]
/* 0333: disable Telemetry Coverage
* [1] https://blog.mozilla.org/data/2018/08/20/effectively-measuring-search-in-firefox/ ***/
user_pref("toolkit.telemetry.coverage.opt-out", true); // [HIDDEN PREF]
user_pref("toolkit.coverage.opt-out", true); // [FF64+] [HIDDEN PREF]
user_pref("toolkit.coverage.endpoint.base", "");
/* 0334: disable PingCentre telemetry (used in several System Add-ons) [FF57+]
* Defense-in-depth: currently covered by 0331 ***/
user_pref("browser.ping-centre.telemetry", false);
/** STUDIES ***/
/* 0340: disable Studies
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to install and run studies ***/
user_pref("app.shield.optoutstudies.enabled", false);
/* 0341: disable Normandy/Shield [FF60+]
* Shield is a telemetry system that can push and test "recipes"
* [1] https://mozilla.github.io/normandy/ ***/
user_pref("app.normandy.enabled", false);
user_pref("app.normandy.api_url", "");
/** CRASH REPORTS ***/
/* 0350: disable Crash Reports ***/
user_pref("breakpad.reportURL", "");
user_pref("browser.tabs.crashReporting.sendReport", false); // [FF44+]
// user_pref("browser.crashReports.unsubmittedCheck.enabled", false); // [FF51+] [DEFAULT: false]
/* 0351: enforce no submission of backlogged Crash Reports [FF58+]
* [SETTING] Privacy & Security>Firefox Data Collection & Use>Allow Firefox to send backlogged crash reports ***/
user_pref("browser.crashReports.unsubmittedCheck.autoSubmit2", false); // [DEFAULT: false]
/** OTHER ***/
/* 0360: disable Captive Portal detection
* [1] https://www.eff.org/deeplinks/2017/08/how-captive-portals-interfere-wireless-security-and-privacy ***/
user_pref("captivedetect.canonicalURL", "");
user_pref("network.captive-portal-service.enabled", false); // [FF52+]
/* 0361: disable Network Connectivity checks [FF65+]
* [1] https://bugzilla.mozilla.org/1460537 ***/
user_pref("network.connectivity-service.enabled", false);
/* 0362: enforce disabling of Web Compatibility Reporter [FF56+]
* Web Compatibility Reporter adds a "Report Site Issue" button to send data to Mozilla ***/
user_pref("extensions.webcompat-reporter.enabled", false); // [DEFAULT: false]
/*** [SECTION 0400]: SAFE BROWSING (SB)
SB has taken many steps to preserve privacy. If required, a full url is never sent
to Google, only a part-hash of the prefix, hidden with noise of other real part-hashes.
Firefox takes measures such as stripping out identifying parameters and since SBv4 (FF57+)
doesn't even use cookies. (#Turn on browser.safebrowsing.debug to monitor this activity)
[1] https://feeding.cloud.geek.nz/posts/how-safe-browsing-works-in-firefox/
[2] https://wiki.mozilla.org/Security/Safe_Browsing
[3] https://support.mozilla.org/kb/how-does-phishing-and-malware-protection-work
***/
user_pref("_user.js.parrot", "0400 syntax error: the parrot's passed on!");
/* 0401: disable SB (Safe Browsing)
* [WARNING] Do this at your own risk! These are the master switches
* [SETTING] Privacy & Security>Security>... Block dangerous and deceptive content ***/
user_pref("browser.safebrowsing.malware.enabled", false);
user_pref("browser.safebrowsing.phishing.enabled", false);
/* 0402: disable SB checks for downloads (both local lookups + remote)
* This is the master switch for the safebrowsing.downloads* prefs (0403, 0404)
* [SETTING] Privacy & Security>Security>... "Block dangerous downloads" ***/
user_pref("browser.safebrowsing.downloads.enabled", false);
/* 0403: disable SB checks for downloads (remote)
* To verify the safety of certain executable files, Firefox may submit some information about the
* file, including the name, origin, size and a cryptographic hash of the contents, to the Google
* Safe Browsing service which helps Firefox determine whether or not the file should be blocked
* [SETUP-SECURITY] If you do not understand this, or you want this protection, then override it ***/
user_pref("browser.safebrowsing.downloads.remote.enabled", false);
user_pref("browser.safebrowsing.downloads.remote.url", "");
/* 0404: disable SB checks for unwanted software
* [SETTING] Privacy & Security>Security>... "Warn you about unwanted and uncommon software" ***/
user_pref("browser.safebrowsing.downloads.remote.block_potentially_unwanted", false);
user_pref("browser.safebrowsing.downloads.remote.block_uncommon", false);
/* 0405: disable "ignore this warning" on SB warnings [FF45+]
* If clicked, it bypasses the block for that session. This is a means for admins to enforce SB
* [TEST] see github wiki APPENDIX A: Test Sites: Section 5
* [1] https://bugzilla.mozilla.org/1226490 ***/
// user_pref("browser.safebrowsing.allowOverride", false);
/*** [SECTION 0600]: BLOCK IMPLICIT OUTBOUND [not explicitly asked for - e.g. clicked on] ***/
user_pref("_user.js.parrot", "0600 syntax error: the parrot's no more!");
/* 0601: disable link prefetching
* [1] https://developer.mozilla.org/docs/Web/HTTP/Link_prefetching_FAQ ***/
user_pref("network.prefetch-next", false);
/* 0602: disable DNS prefetching
* [1] https://developer.mozilla.org/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control ***/
user_pref("network.dns.disablePrefetch", true);
// user_pref("network.dns.disablePrefetchFromHTTPS", true); // [DEFAULT: true]
/* 0603: disable predictor / prefetching ***/
user_pref("network.predictor.enabled", false);
// user_pref("network.predictor.enable-prefetch", false); // [FF48+] [DEFAULT: false]
/* 0604: disable link-mouseover opening connection to linked server
* [1] https://news.slashdot.org/story/15/08/14/2321202/how-to-quash-firefoxs-silent-requests ***/
user_pref("network.http.speculative-parallel-limit", 0);
/* 0605: enforce no "Hyperlink Auditing" (click tracking)
* [1] https://www.bleepingcomputer.com/news/software/major-browsers-to-prevent-disabling-of-click-tracking-privacy-risk/ ***/
// user_pref("browser.send_pings", false); // [DEFAULT: false]
/*** [SECTION 0700]: DNS / DoH / PROXY / SOCKS / IPv6 ***/
user_pref("_user.js.parrot", "0700 syntax error: the parrot's given up the ghost!");
/* 0701: disable IPv6
* IPv6 can be abused, especially with MAC addresses, and can leak with VPNs: assuming
* your ISP and/or router and/or website is IPv6 capable. Most sites will fall back to IPv4
* [STATS] Firefox telemetry (July 2021) shows ~10% of all connections are IPv6
* [NOTE] This is an application level fallback. Disabling IPv6 is best done at an
* OS/network level, and/or configured properly in VPN setups. If you are not masking your IP,
* then this won't make much difference. If you are masking your IP, then it can only help.
* [NOTE] PHP defaults to IPv6 with "localhost". Use "php -S 127.0.0.1:PORT"
* [TEST] https://ipleak.org/
* [1] https://www.internetsociety.org/tag/ipv6-security/ (Myths 2,4,5,6) ***/
user_pref("network.dns.disableIPv6", true);
/* 0702: set the proxy server to do any DNS lookups when using SOCKS
* e.g. in Tor, this stops your local DNS server from knowing your Tor destination
* as a remote Tor node will handle the DNS request
* [1] https://trac.torproject.org/projects/tor/wiki/doc/TorifyHOWTO/WebBrowsers ***/
user_pref("network.proxy.socks_remote_dns", true);
/* 0703: disable using UNC (Uniform Naming Convention) paths [FF61+]
* [SETUP-CHROME] Can break extensions for profiles on network shares
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/26424 ***/
user_pref("network.file.disable_unc_paths", true); // [HIDDEN PREF]
/* 0704: disable GIO as a potential proxy bypass vector [FF60+]
* Gvfs/GIO has a set of supported protocols like obex, network, archive, computer, dav, cdda,
* gphoto2, trash, etc. By default only smb and sftp protocols are accepted so far (as of FF64)
* [1] https://bugzilla.mozilla.org/1433507
* [2] https://en.wikipedia.org/wiki/GVfs
* [3] https://en.wikipedia.org/wiki/GIO_(software) ***/
user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF]
/* 0705: disable proxy direct failover for system requests [FF91+]
* [WARNING] Default true is a security feature against malicious extensions [1]
* [SETUP-CHROME] If you use a proxy and you trust your extensions
* [1] https://blog.mozilla.org/security/2021/10/25/securing-the-proxy-api-for-firefox-add-ons/ ***/
// user_pref("network.proxy.failover_direct", false);
/* 0710: disable DNS-over-HTTPS (DoH) rollout [FF60+]
* 0=off by default, 2=TRR (Trusted Recursive Resolver) first, 3=TRR only, 5=explicitly off
* see "doh-rollout.home-region": USA Feb 2020, Canada July 2021 [3]
* [1] https://hacks.mozilla.org/2018/05/a-cartoon-intro-to-dns-over-https/
* [2] https://wiki.mozilla.org/Security/DOH-resolver-policy
* [3] https://blog.mozilla.org/mozilla/news/firefox-by-default-dns-over-https-rollout-in-canada/
* [4] https://www.eff.org/deeplinks/2020/12/dns-doh-and-odoh-oh-my-year-review-2020 ***/
user_pref("network.trr.mode", 5);
/*** [SECTION 0800]: LOCATION BAR / SEARCH BAR / SUGGESTIONS / HISTORY / FORMS ***/
user_pref("_user.js.parrot", "0800 syntax error: the parrot's ceased to be!");
/* 0801: disable location bar using search
* Don't leak URL typos to a search engine, give an error message instead
* Examples: "secretplace,com", "secretplace/com", "secretplace com", "secret place.com"
* [NOTE] This does not affect explicit user action such as using search buttons in the
* dropdown, or using keyword search shortcuts you configure in options (e.g. "d" for DuckDuckGo)
* [SETUP-CHROME] If you don't, or rarely, type URLs, or you use a default search
* engine that respects privacy, then you probably don't need this ***/
user_pref("keyword.enabled", false);
/* 0802: disable location bar domain guessing
* domain guessing intercepts DNS "hostname not found errors" and resends a
* request (e.g. by adding www or .com). This is inconsistent use (e.g. FQDNs), does not work
* via Proxy Servers (different error), is a flawed use of DNS (TLDs: why treat .com
* as the 411 for DNS errors?), privacy issues (why connect to sites you didn't
* intend to), can leak sensitive data (e.g. query strings: e.g. Princeton attack),
* and is a security risk (e.g. common typos & malicious sites set up to exploit this) ***/
user_pref("browser.fixup.alternate.enabled", false);
/* 0803: display all parts of the url in the location bar ***/
user_pref("browser.urlbar.trimURLs", false);
/* 0804: disable live search suggestions
* [NOTE] Both must be true for the location bar to work
* [SETUP-CHROME] Change these if you trust and use a privacy respecting search engine
* [SETTING] Search>Provide search suggestions | Show search suggestions in address bar results ***/
user_pref("browser.search.suggest.enabled", false);
user_pref("browser.urlbar.suggest.searches", false);
/* 0805: disable location bar making speculative connections [FF56+]
* [1] https://bugzilla.mozilla.org/1348275 ***/
user_pref("browser.urlbar.speculativeConnect.enabled", false);
/* 0806: disable location bar leaking single words to a DNS provider **after searching** [FF78+]
* 0=never resolve single words, 1=heuristic (default), 2=always resolve
* [1] https://bugzilla.mozilla.org/1642623 ***/
user_pref("browser.urlbar.dnsResolveSingleWordsAfterSearch", 0);
/* 0807: disable location bar contextual suggestions [FF92+]
* [SETTING] Privacy & Security>Address Bar>Contextual Suggestions
* [1] https://blog.mozilla.org/data/2021/09/15/data-and-firefox-suggest/ ***/
user_pref("browser.urlbar.suggest.quicksuggest", false);
user_pref("browser.urlbar.suggest.quicksuggest.sponsored", false);
/* 0808: disable tab-to-search [FF85+]
* Alternatively, you can exclude on a per-engine basis by unchecking them in Options>Search
* [SETTING] Privacy & Security>Address Bar>When using the address bar, suggest>Search engines ***/
// user_pref("browser.urlbar.suggest.engines", false);
/* 0810: disable search and form history
* [SETUP-WEB] Be aware that autocomplete form data can be read by third parties [1][2]
* [NOTE] We also clear formdata on exit (2811)
* [SETTING] Privacy & Security>History>Custom Settings>Remember search and form history
* [1] https://blog.mindedsecurity.com/2011/10/autocompleteagain.html
* [2] https://bugzilla.mozilla.org/381681 ***/
user_pref("browser.formfill.enable", false);
/* 0811: disable Form Autofill
* [NOTE] Stored data is NOT secure (uses a JSON file)
* [NOTE] Heuristics controls Form Autofill on forms without @autocomplete attributes
* [SETTING] Privacy & Security>Forms and Autofill>Autofill addresses
* [1] https://wiki.mozilla.org/Firefox/Features/Form_Autofill ***/
user_pref("extensions.formautofill.addresses.enabled", false); // [FF55+]
user_pref("extensions.formautofill.available", "off"); // [FF56+]
user_pref("extensions.formautofill.creditCards.available", false); // [FF57+]
user_pref("extensions.formautofill.creditCards.enabled", false); // [FF56+]
user_pref("extensions.formautofill.heuristics.enabled", false); // [FF55+]
/* 0820: disable coloring of visited links
* [SETUP-HARDEN] Bulk rapid history sniffing was mitigated in 2010 [1][2]. Slower and more expensive
* redraw timing attacks were largely mitigated in FF77+ [3]. Using RFP (4501) further hampers timing
* attacks. Don't forget clearing history on exit (2811). However, social engineering [2#limits][4][5]
* and advanced targeted timing attacks could still produce usable results
* [1] https://developer.mozilla.org/docs/Web/CSS/Privacy_and_the_:visited_selector
* [2] https://dbaron.org/mozilla/visited-privacy
* [3] https://bugzilla.mozilla.org/1632765
* [4] https://earthlng.github.io/testpages/visited_links.html (see github wiki APPENDIX A on how to use)
* [5] https://lcamtuf.blogspot.com/2016/08/css-mix-blend-mode-is-bad-for-keeping.html ***/
user_pref("layout.css.visited_links_enabled", false);
/*** [SECTION 0900]: PASSWORDS
[1] https://support.mozilla.org/kb/use-primary-password-protect-stored-logins-and-pas
***/
user_pref("_user.js.parrot", "0900 syntax error: the parrot's expired!");
/* 0901: set when Firefox should prompt for the primary password
* 0=once per session (default), 1=every time it's needed, 2=after n minutes (0902) ***/
user_pref("security.ask_for_password", 2);
/* 0902: set how long in minutes Firefox should remember the primary password (0901) ***/
user_pref("security.password_lifetime", 5); // [DEFAULT: 30]
/* 0903: disable auto-filling username & password form fields
* can leak in cross-site forms *and* be spoofed
* [NOTE] Username & password is still available when you enter the field
* [SETTING] Privacy & Security>Logins and Passwords>Autofill logins and passwords
* [1] https://freedom-to-tinker.com/2017/12/27/no-boundaries-for-user-identities-web-trackers-exploit-browser-login-managers/ ***/
user_pref("signon.autofillForms", false);
/* 0904: disable formless login capture for Password Manager [FF51+] ***/
user_pref("signon.formlessCapture.enabled", false);
/* 0905: limit (or disable) HTTP authentication credentials dialogs triggered by sub-resources [FF41+]
* hardens against potential credentials phishing
* 0 = don't allow sub-resources to open HTTP authentication credentials dialogs
* 1 = don't allow cross-origin sub-resources to open HTTP authentication credentials dialogs
* 2 = allow sub-resources to open HTTP authentication credentials dialogs (default) ***/
user_pref("network.auth.subresource-http-auth-allow", 1);
/* 0906: enforce no automatic authentication on Microsoft sites [FF91+] [WINDOWS 10+]
* [SETTING] Privacy & Security>Logins and Passwords>Allow Windows single sign-on for...
* [1] https://support.mozilla.org/kb/windows-sso ***/
user_pref("network.http.windows-sso.enabled", false); // [DEFAULT: false]
/*** [SECTION 1000]: DISK AVOIDANCE ***/
user_pref("_user.js.parrot", "1000 syntax error: the parrot's gone to meet 'is maker!");
/* 1001: disable disk cache
* [SETUP-CHROME] If you think disk cache helps perf, then feel free to override this
* [NOTE] We also clear cache on exit (2811) ***/
user_pref("browser.cache.disk.enable", false);
/* 1002: disable media cache from writing to disk in Private Browsing
* [NOTE] MSE (Media Source Extensions) are already stored in-memory in PB ***/
user_pref("browser.privatebrowsing.forceMediaMemoryCache", true); // [FF75+]
user_pref("media.memory_cache_max_size", 65536);
/* 1003: disable storing extra session data [SETUP-CHROME]
* define on which sites to save extra session data such as form content, cookies and POST data
* 0=everywhere, 1=unencrypted sites, 2=nowhere ***/
user_pref("browser.sessionstore.privacy_level", 2);
/* 1004: set the minimum interval between session save operations
* Increasing this can help on older machines and some websites, as well as reducing writes [1]
* [1] https://bugzilla.mozilla.org/1304389 ***/
user_pref("browser.sessionstore.interval", 30000); // [DEFAULT: 15000]
/* 1005: disable automatic Firefox start and session restore after reboot [FF62+] [WINDOWS]
* [1] https://bugzilla.mozilla.org/603903 ***/
user_pref("toolkit.winRegisterApplicationRestart", false);
/* 1006: disable favicons in shortcuts
* URL shortcuts use a cached randomly named .ico file which is stored in your
* profile/shortcutCache directory. The .ico remains after the shortcut is deleted
* If set to false then the shortcuts use a generic Firefox icon ***/
user_pref("browser.shell.shortcutFavicons", false);
/*** [SECTION 1200]: HTTPS (SSL/TLS / OCSP / CERTS / HPKP)
Your cipher and other settings can be used in server side fingerprinting
[TEST] https://www.ssllabs.com/ssltest/viewMyClient.html
[TEST] https://browserleaks.com/ssl
[TEST] https://ja3er.com/
[1] https://www.securityartwork.es/2017/02/02/tls-client-fingerprinting-with-bro/
***/
user_pref("_user.js.parrot", "1200 syntax error: the parrot's a stiff!");
/** SSL (Secure Sockets Layer) / TLS (Transport Layer Security) ***/
/* 1201: require safe negotiation
* Blocks connections (SSL_ERROR_UNSAFE_NEGOTIATION) to servers that don't support RFC 5746 [2]
* as they're potentially vulnerable to a MiTM attack [3]. A server without RFC 5746 can be
* safe from the attack if it disables renegotiations but the problem is that the browser can't
* know that. Setting this pref to true is the only way for the browser to ensure there will be
* no unsafe renegotiations on the channel between the browser and the server.
* [STATS] SSL Labs (July 2021) reports over 99% of sites have secure renegotiation [4]
* [1] https://wiki.mozilla.org/Security:Renegotiation
* [2] https://tools.ietf.org/html/rfc5746
* [3] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555
* [4] https://www.ssllabs.com/ssl-pulse/ ***/
user_pref("security.ssl.require_safe_negotiation", true);
/* 1203: reset TLS 1.0 and 1.1 downgrades i.e. session only ***/
user_pref("security.tls.version.enable-deprecated", false); // [DEFAULT: false]
/* 1206: disable TLS1.3 0-RTT (round-trip time) [FF51+]
* [1] https://github.com/tlswg/tls13-spec/issues/1001
* [2] https://blog.cloudflare.com/tls-1-3-overview-and-q-and-a/ ***/
user_pref("security.tls.enable_0rtt_data", false);
/** OCSP (Online Certificate Status Protocol)
[1] https://scotthelme.co.uk/revocation-is-broken/
[2] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
***/
/* 1211: enforce OCSP fetching to confirm current validity of certificates
* 0=disabled, 1=enabled (default), 2=enabled for EV certificates only
* OCSP (non-stapled) leaks information about the sites you visit to the CA (cert authority)
* It's a trade-off between security (checking) and privacy (leaking info to the CA)
* [NOTE] This pref only controls OCSP fetching and does not affect OCSP stapling
* [SETTING] Privacy & Security>Security>Certificates>Query OCSP responder servers...
* [1] https://en.wikipedia.org/wiki/Ocsp ***/
user_pref("security.OCSP.enabled", 1); // [DEFAULT: 1]
/* 1212: set OCSP fetch failures (non-stapled, see 1211) to hard-fail [SETUP-WEB]
* When a CA cannot be reached to validate a cert, Firefox just continues the connection (=soft-fail)
* Setting this pref to true tells Firefox to instead terminate the connection (=hard-fail)
* It is pointless to soft-fail when an OCSP fetch fails: you cannot confirm a cert is still valid (it
* could have been revoked) and/or you could be under attack (e.g. malicious blocking of OCSP servers)
* [1] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
* [2] https://www.imperialviolet.org/2014/04/19/revchecking.html ***/
user_pref("security.OCSP.require", true);
/** CERTS / HPKP (HTTP Public Key Pinning) ***/
/* 1220: disable or limit SHA-1 certificates
* 0 = allow all
* 1 = block all
* 3 = only allow locally-added roots (e.g. anti-virus) (default)
* 4 = only allow locally-added roots or for certs in 2015 and earlier
* [SETUP-CHROME] If you have problems, update your software: SHA-1 is obsolete
* [1] https://blog.mozilla.org/security/2016/10/18/phasing-out-sha-1-on-the-public-web/ ***/
user_pref("security.pki.sha1_enforcement_level", 1);
/* 1221: disable Windows 8.1's Microsoft Family Safety cert [FF50+] [WINDOWS]
* 0=disable detecting Family Safety mode and importing the root
* 1=only attempt to detect Family Safety mode (don't import the root)
* 2=detect Family Safety mode and import the root
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/21686 ***/
user_pref("security.family_safety.mode", 0);
/* 1223: enable strict pinning
* PKP (Public Key Pinning) 0=disabled, 1=allow user MiTM (such as your antivirus), 2=strict
* [SETUP-WEB] If you rely on an AV (antivirus) to protect your web browsing
* by inspecting ALL your web traffic, then leave at current default=1
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16206 ***/
user_pref("security.cert_pinning.enforcement_level", 2);
/* 1224: enable CRLite [FF73+]
* In FF84+ it covers valid certs and in mode 2 doesn't fall back to OCSP
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1429800,1670985
* [2] https://blog.mozilla.org/security/tag/crlite/ ***/
user_pref("security.remote_settings.crlite_filters.enabled", true);
user_pref("security.pki.crlite_mode", 2);
/** MIXED CONTENT ***/
/* 1241: disable insecure passive content (such as images) on https pages [SETUP-WEB] ***/
user_pref("security.mixed_content.block_display_content", true);
/* 1244: enable HTTPS-Only mode in all windows [FF76+]
* When the top-level is HTTPS, insecure subresources are also upgraded (silent fail)
* [SETTING] to add site exceptions: Padlock>HTTPS-Only mode>On (after "Continue to HTTP Site")
* [SETTING] Privacy & Security>HTTPS-Only Mode (and manage exceptions)
* [TEST] http://example.com [upgrade]
* [TEST] http://neverssl.com/ [no upgrade] ***/
user_pref("dom.security.https_only_mode", true); // [FF76+]
user_pref("dom.security.https_only_mode_pbm", true); // [FF80+]
/* 1245: enable HTTPS-Only mode for local resources [FF77+] ***/
user_pref("dom.security.https_only_mode.upgrade_local", true);
/* 1246: disable HTTP background requests [FF82+]
* When attempting to upgrade, if the server doesn't respond within 3 seconds,
* Firefox sends HTTP requests in order to check if the server supports HTTPS or not
* This is done to avoid waiting for a timeout which takes 90 seconds
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1642387,1660945 ***/
user_pref("dom.security.https_only_mode_send_http_background_request", false);
/** UI (User Interface) ***/
/* 1270: display warning on the padlock for "broken security" (if 1201 is false)
* Bug: warning padlock not indicated for subresources on a secure page! [2]
* [1] https://wiki.mozilla.org/Security:Renegotiation
* [2] https://bugzilla.mozilla.org/1353705 ***/
user_pref("security.ssl.treat_unsafe_negotiation_as_broken", true);
/* 1271: control "Add Security Exception" dialog on SSL warnings
* 0=do neither, 1=pre-populate url, 2=pre-populate url + pre-fetch cert (default)
* [1] https://github.com/pyllyukko/user.js/issues/210 ***/
user_pref("browser.ssl_override_behavior", 1);
/* 1272: display advanced information on Insecure Connection warning pages
* only works when it's possible to add an exception
* i.e. it doesn't work for HSTS discrepancies (https://subdomain.preloaded-hsts.badssl.com/)
* [TEST] https://expired.badssl.com/ ***/
user_pref("browser.xul.error_pages.expert_bad_cert", true);
/* 1273: display "Not Secure" text on HTTP sites ***/
user_pref("security.insecure_connection_text.enabled", true); // [FF60+]
/*** [SECTION 1400]: FONTS ***/
user_pref("_user.js.parrot", "1400 syntax error: the parrot's bereft of life!");
/* 1401: disable rendering of SVG OpenType fonts ***/
user_pref("gfx.font_rendering.opentype_svg.enabled", false);
/* 1402: limit font visibility (Windows, Mac, some Linux) [FF94+]
* Uses hardcoded lists with two parts: kBaseFonts + kLangPackFonts [1], bundled fonts are auto-allowed
* In normal windows: uses the first applicable: RFP (4506) over TP over Standard
* In Private Browsing windows: uses the most restrictive between normal and private
* 1=only base system fonts, 2=also fonts from optional language packs, 3=also user-installed fonts
* [1] https://searchfox.org/mozilla-central/search?path=StandardFonts*.inc ***/
user_pref("layout.css.font-visibility.private", 1);
user_pref("layout.css.font-visibility.standard", 1);
user_pref("layout.css.font-visibility.trackingprotection", 1);
/*** [SECTION 1600]: HEADERS / REFERERS
Expect some breakage e.g. banks: use an extension if you need precise control
full URI: https://example.com:8888/foo/bar.html?id=1234
scheme+host+port+path: https://example.com:8888/foo/bar.html
scheme+host+port: https://example.com:8888
[1] https://feeding.cloud.geek.nz/posts/tweaking-referrer-for-privacy-in-firefox/
***/
user_pref("_user.js.parrot", "1600 syntax error: the parrot rests in peace!");
/* 1601: control when to send a cross-origin referer
* 0=always (default), 1=only if base domains match, 2=only if hosts match
* [SETUP-WEB] Known to cause issues with older modems/routers and some sites e.g vimeo, icloud, instagram ***/
user_pref("network.http.referer.XOriginPolicy", 2);
/* 1602: control the amount of cross-origin information to send [FF52+]
* 0=send full URI (default), 1=scheme+host+port+path, 2=scheme+host+port ***/
user_pref("network.http.referer.XOriginTrimmingPolicy", 2);
/* 1603: enable the DNT (Do Not Track) HTTP header
* [NOTE] DNT is enforced with Enhanced Tracking Protection (2710)
* [SETTING] Privacy & Security>Enhanced Tracking Protection>Send websites a "Do Not Track" signal... ***/
user_pref("privacy.donottrackheader.enabled", true);
/*** [SECTION 1700]: CONTAINERS
Check out Temporary Containers [2], read the article [3], and visit the wiki/repo [4]
[1] https://wiki.mozilla.org/Security/Contextual_Identity_Project/Containers
[2] https://addons.mozilla.org/firefox/addon/temporary-containers/
[3] https://medium.com/@stoically/enhance-your-privacy-in-firefox-with-temporary-containers-33925cd6cd21
[4] https://github.com/stoically/temporary-containers/wiki
***/
user_pref("_user.js.parrot", "1700 syntax error: the parrot's bit the dust!");
/* 1701: enable Container Tabs and its UI setting [FF50+]
* [SETTING] General>Tabs>Enable Container Tabs ***/
user_pref("privacy.userContext.enabled", true);
user_pref("privacy.userContext.ui.enabled", true);
/* 1702: set behaviour on "+ Tab" button to display container menu on left click [FF74+]
* [NOTE] The menu is always shown on long press and right click
* [SETTING] General>Tabs>Enable Container Tabs>Settings>Select a container for each new tab ***/
user_pref("privacy.userContext.newTabContainerOnLeftClick.enabled", true);
/*** [SECTION 2000]: PLUGINS / MEDIA / WEBRTC ***/
user_pref("_user.js.parrot", "2000 syntax error: the parrot's snuffed it!");
/* 2001: disable WebRTC (Web Real-Time Communication)
* [SETUP-WEB] WebRTC can leak your private network address from behind your VPN, but if this
* is not your threat model, and you want Real-Time Communication, this is the pref for you ***/
user_pref("media.peerconnection.enabled", false);
/* 2002: limit WebRTC private network address leaks
* In FF70+ these settings match Mode 4 (Mode 3 in older versions) [3]
* [TEST] https://browserleaks.com/webrtc
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1189041,1297416,1452713
* [2] https://wiki.mozilla.org/Media/WebRTC/Privacy
* [3] https://tools.ietf.org/html/draft-ietf-rtcweb-ip-handling-12#section-5.2 ***/
user_pref("media.peerconnection.ice.default_address_only", true);
user_pref("media.peerconnection.ice.no_host", true); // [FF51+]
user_pref("media.peerconnection.ice.proxy_only_if_behind_proxy", true); // [FF70+]
/* 2020: disable GMP (Gecko Media Plugins)
* [1] https://wiki.mozilla.org/GeckoMediaPlugins ***/
user_pref("media.gmp-provider.enabled", false);
/* 2021: disable widevine CDM (Content Decryption Module)
* [NOTE] This is covered by the EME master switch (2022) ***/
user_pref("media.gmp-widevinecdm.enabled", false);
/* 2022: disable all DRM content (EME: Encryption Media Extension)
* [SETUP-WEB] e.g. Netflix, Amazon Prime, Hulu, HBO, Disney+, Showtime, Starz, DirectTV
* [SETTING] General>DRM Content>Play DRM-controlled content
* [TEST] https://bitmovin.com/demos/drm
* [1] https://www.eff.org/deeplinks/2017/10/drms-dead-canary-how-we-just-lost-web-what-we-learned-it-and-what-we-need-do-next ***/
user_pref("media.eme.enabled", false);
/* 2030: disable autoplay of HTML5 media [FF63+]
* 0=Allow all, 1=Block non-muted media (default), 5=Block all
* [NOTE] You can set exceptions under site permissions
* [SETTING] Privacy & Security>Permissions>Autoplay>Settings>Default for all websites ***/
user_pref("media.autoplay.default", 5);
/* 2031: disable autoplay of HTML5 media if you interacted with the site [FF78+]
* 0=sticky (default), 1=transient, 2=user
* Firefox's Autoplay Policy Documentation [PDF] is linked below via SUMO
* [NOTE] If you have trouble with some video sites, then add an exception (2030)
* [1] https://support.mozilla.org/questions/1293231 ***/
user_pref("media.autoplay.blocking_policy", 2);
/*** [SECTION 2300]: WEB WORKERS
A worker is a JS "background task" running in a global context, i.e. it is different from
the current window. Workers can spawn new workers (must be the same origin & scheme),
including service and shared workers. Shared workers can be utilized by multiple scripts and
communicate between browsing contexts (windows/tabs/iframes) and can even control your cache.
[1] Web Workers: https://developer.mozilla.org/docs/Web/API/Web_Workers_API
[2] Worker: https://developer.mozilla.org/docs/Web/API/Worker
[3] Service Worker: https://developer.mozilla.org/docs/Web/API/Service_Worker_API
[4] SharedWorker: https://developer.mozilla.org/docs/Web/API/SharedWorker
[5] ChromeWorker: https://developer.mozilla.org/docs/Web/API/ChromeWorker
[6] Notifications: https://support.mozilla.org/questions/1165867#answer-981820
***/
user_pref("_user.js.parrot", "2300 syntax error: the parrot's off the twig!");
/* 2302: disable service workers [FF32, FF44-compat]
* Service workers essentially act as proxy servers that sit between web apps, and the
* browser and network, are event driven, and can control the web page/site they are associated
* with, intercepting and modifying navigation and resource requests, and caching resources.
* [NOTE] Service workers require HTTPS, have no DOM access, and are not supported in PB mode [1]
* [SETUP-WEB] Disabling service workers will break some sites. This pref is required true for
* service worker notifications (2304), push notifications (disabled, 2305) and service worker
* cache (2740). If you enable this pref, then check those settings as well
* [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1320796#c7 ***/
user_pref("dom.serviceWorkers.enabled", false);
/* 2304: disable Web Notifications
* [NOTE] Web Notifications can also use service workers (2302) and are behind a prompt (7002)
* [1] https://developer.mozilla.org/docs/Web/API/Notifications_API ***/
user_pref("dom.webnotifications.enabled", false); // [FF22+]
user_pref("dom.webnotifications.serviceworker.enabled", false); // [FF44+]
/* 2305: disable Push Notifications [FF44+]
* Push is an API that allows websites to send you (subscribed) messages even when the site
* isn't loaded, by pushing messages to your userAgentID through Mozilla's Push Server
* [NOTE] Push requires service workers (2302) to subscribe to and display, and is behind
* a prompt (7002). Disabling service workers alone doesn't stop Firefox polling the
* Mozilla Push Server. To remove all subscriptions, reset your userAgentID.
* [1] https://support.mozilla.org/kb/push-notifications-firefox
* [2] https://developer.mozilla.org/docs/Web/API/Push_API ***/
user_pref("dom.push.enabled", false);
user_pref("dom.push.userAgentID", "");
/*** [SECTION 2400]: DOM (DOCUMENT OBJECT MODEL) ***/
user_pref("_user.js.parrot", "2400 syntax error: the parrot's kicked the bucket!");
/* 2401: disable "Confirm you want to leave" dialog on page close
* Does not prevent JS leaks of the page close event
* [1] https://developer.mozilla.org/docs/Web/Events/beforeunload ***/
user_pref("dom.disable_beforeunload", true);
/* 2402: prevent scripts from moving and resizing open windows ***/
user_pref("dom.disable_window_move_resize", true);
/* 2403: block popup windows
* [SETTING] Privacy & Security>Permissions>Block pop-up windows ***/
user_pref("dom.disable_open_during_load", true);
/* 2404: limit events that can cause a popup [SETUP-WEB] ***/
user_pref("dom.popup_allowed_events", "click dblclick mousedown pointerdown");
/*** [SECTION 2600]: MISCELLANEOUS ***/
user_pref("_user.js.parrot", "2600 syntax error: the parrot's run down the curtain!");
/* 2601: prevent accessibility services from accessing your browser [RESTART]
* [1] https://support.mozilla.org/kb/accessibility-services ***/
user_pref("accessibility.force_disabled", 1);
/* 2602: disable sending additional analytics to web servers
* [1] https://developer.mozilla.org/docs/Web/API/Navigator/sendBeacon ***/
user_pref("beacon.enabled", false);
/* 2603: remove temp files opened with an external application
* [1] https://bugzilla.mozilla.org/302433 ***/
user_pref("browser.helperApps.deleteTempFileOnExit", true);
/* 2604: disable page thumbnail collection ***/
user_pref("browser.pagethumbnails.capturing_disabled", true); // [HIDDEN PREF]
/* 2606: disable UITour backend so there is no chance that a remote page can use it ***/
user_pref("browser.uitour.enabled", false);
user_pref("browser.uitour.url", "");
/* 2607: disable various developer tools in browser context
* [SETTING] Devtools>Advanced Settings>Enable browser chrome and add-on debugging toolboxes
* [1] https://github.com/pyllyukko/user.js/issues/179#issuecomment-246468676 ***/
user_pref("devtools.chrome.enabled", false);
/* 2608: reset remote debugging to disabled
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16222 ***/
user_pref("devtools.debugger.remote-enabled", false); // [DEFAULT: false]
/* 2611: disable middle mouse click opening links from clipboard
* [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/10089 ***/
user_pref("middlemouse.contentLoadURL", false);
/* 2615: disable websites overriding Firefox's keyboard shortcuts [FF58+]
* 0 (default) or 1=allow, 2=block
* [SETTING] to add site exceptions: Ctrl+I>Permissions>Override Keyboard Shortcuts ***/
user_pref("permissions.default.shortcuts", 2);
/* 2616: remove special permissions for certain mozilla domains [FF35+]
* [1] resource://app/defaults/permissions ***/
user_pref("permissions.manager.defaultsUrl", "");
/* 2617: remove webchannel whitelist ***/
user_pref("webchannel.allowObject.urlWhitelist", "");
/* 2619: use Punycode in Internationalized Domain Names to eliminate possible spoofing
* [SETUP-WEB] Might be undesirable for non-latin alphabet users since legitimate IDN's are also punycoded
* [TEST] https://www.xn--80ak6aa92e.com/ (www.apple.com)
* [1] https://wiki.mozilla.org/IDN_Display_Algorithm
* [2] https://en.wikipedia.org/wiki/IDN_homograph_attack
* [3] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=punycode+firefox
* [4] https://www.xudongz.com/blog/2017/idn-phishing/ ***/
user_pref("network.IDN_show_punycode", true);
/* 2620: enforce PDFJS, disable PDFJS scripting [SETUP-CHROME]
* This setting controls if the option "Display in Firefox" is available in the setting below
* and by effect controls whether PDFs are handled in-browser or externally ("Ask" or "Open With")
* PROS: pdfjs is lightweight, open source, and more secure/vetted than most
* Exploits are rare (one serious case in seven years), treated seriously and patched quickly.
* It doesn't break "state separation" of browser content (by not sharing with OS, independent apps).
* It maintains disk avoidance and application data isolation. It's convenient. You can still save to disk.
* CONS: You may prefer a different pdf reader for security reasons
* CAVEAT: JS can still force a pdf to open in-browser by bundling its own code
* [SETTING] General>Applications>Portable Document Format (PDF) ***/
user_pref("pdfjs.disabled", false); // [DEFAULT: false]
user_pref("pdfjs.enableScripting", false); // [FF86+]
/* 2621: disable links launching Windows Store on Windows 8/8.1/10 [WINDOWS] ***/
user_pref("network.protocol-handler.external.ms-windows-store", false);
/* 2623: disable permissions delegation [FF73+]
* Currently applies to cross-origin geolocation, camera, mic and screen-sharing
* permissions, and fullscreen requests. Disabling delegation means any prompts
* for these will show/use their correct 3rd party origin
* [1] https://groups.google.com/forum/#!topic/mozilla.dev.platform/BdFOMAuCGW8/discussion ***/
user_pref("permissions.delegation.enabled", false);
/** DOWNLOADS ***/
/* 2651: enable user interaction for security by always asking where to download
* [SETUP-CHROME] On Android this blocks longtapping and saving images
* [SETTING] General>Downloads>Always ask you where to save files ***/
user_pref("browser.download.useDownloadDir", false);
/* 2652: disable downloads panel opening on every download [FF96+] ***/
user_pref("browser.download.alwaysOpenPanel", false);
/* 2653: disable adding downloads to the system's "recent documents" list ***/
user_pref("browser.download.manager.addToRecentDocs", false);
/** EXTENSIONS ***/
/* 2660: lock down allowed extension directories
* [SETUP-CHROME] This will break extensions, language packs, themes and any other
* XPI files which are installed outside of profile and application directories
* [1] https://mike.kaply.com/2012/02/21/understanding-add-on-scopes/
* [1] https://archive.is/DYjAM (archived) ***/
user_pref("extensions.enabledScopes", 5); // [HIDDEN PREF]
user_pref("extensions.autoDisableScopes", 15); // [DEFAULT: 15]
/* 2661: disable bypassing 3rd party extension install prompts [FF82+]
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1659530,1681331 ***/
user_pref("extensions.postDownloadThirdPartyPrompt", false);
/* 2662: disable webextension restrictions on certain mozilla domains (you also need 4503) [FF60+]
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1384330,1406795,1415644,1453988 ***/
user_pref("extensions.webextensions.restrictedDomains", "");
/*** [SECTION 2700]: PERSISTENT STORAGE
Data SET by websites including
cookies : profile\cookies.sqlite
localStorage : profile\webappsstore.sqlite
indexedDB : profile\storage\default
serviceWorkers :
[NOTE] indexedDB and serviceWorkers are not available in Private Browsing Mode
[NOTE] Blocking cookies also blocks websites access to: localStorage (incl. sessionStorage),
indexedDB, sharedWorker, and serviceWorker (and therefore service worker cache and notifications)
If you set a site exception for cookies (either "Allow" or "Allow for Session") then they become
accessible to websites except shared/service workers where the cookie setting must be "Allow"
***/
user_pref("_user.js.parrot", "2700 syntax error: the parrot's joined the bleedin' choir invisible!");
/* 2701: disable or isolate 3rd-party cookies and site-data [SETUP-WEB]
* 0 = Accept cookies and site data
* 1 = (Block) All third-party cookies
* 2 = (Block) All cookies
* 3 = (Block) Cookies from unvisited websites
* 4 = (Block) Cross-site tracking cookies (default)
* 5 = (Isolate All) Cross-site cookies (TCP: Total Cookie Protection / dFPI: dynamic FPI) [1] (FF86+)
* Option 5 with FPI enabled (4001) is ignored and not shown, and option 4 used instead
* [NOTE] You can set cookie exceptions under site permissions or use an extension
* [NOTE] Enforcing category to custom ensures ETP related prefs are always honored
* [SETTING] Privacy & Security>Enhanced Tracking Protection>Custom>Cookies
* [1] https://blog.mozilla.org/security/2021/02/23/total-cookie-protection/ ***/
user_pref("network.cookie.cookieBehavior", 1);
user_pref("browser.contentblocking.category", "custom");
/* 2710: enable Enhanced Tracking Protection (ETP) in all windows
* [SETTING] Privacy & Security>Enhanced Tracking Protection>Custom>Tracking content
* [SETTING] to add site exceptions: Urlbar>ETP Shield
* [SETTING] to manage site exceptions: Options>Privacy & Security>Enhanced Tracking Protection>Manage Exceptions ***/
user_pref("privacy.trackingprotection.enabled", true);
/* 2711: enable various ETP lists ***/
user_pref("privacy.trackingprotection.socialtracking.enabled", true);
user_pref("privacy.trackingprotection.cryptomining.enabled", true); // [DEFAULT: true]
user_pref("privacy.trackingprotection.fingerprinting.enabled", true); // [DEFAULT: true]
/* 2740: disable service worker cache and cache storage
* [NOTE] We clear service worker cache on exit (2811)
* [1] https://w3c.github.io/ServiceWorker/#privacy ***/
user_pref("dom.caches.enabled", false);
/* 2750: disable Storage API [FF51+]
* The API gives sites the ability to find out how much space they can use, how much
* they are already using, and even control whether or not they need to be alerted
* before the user agent disposes of site data in order to make room for other things.
* [1] https://developer.mozilla.org/docs/Web/API/StorageManager
* [2] https://developer.mozilla.org/docs/Web/API/Storage_API
* [3] https://blog.mozilla.org/l10n/2017/03/07/firefox-l10n-report-aurora-54/ ***/
user_pref("dom.storageManager.enabled", false);
/* 2755: disable Storage Access API [FF65+]
* [1] https://developer.mozilla.org/docs/Web/API/Storage_Access_API ***/
user_pref("dom.storage_access.enabled", false);
/* 2760: enable Local Storage Next Generation (LSNG) [FF65+] ***/
user_pref("dom.storage.next_gen", true); // [DEFAULT: true FF92+]
/*** [SECTION 2800]: SHUTDOWN & SANITIZING ***/
user_pref("_user.js.parrot", "2800 syntax error: the parrot's bleedin' demised!");
/** COOKIES + SITE DATA : ALLOWS EXCEPTIONS ***/
/* 2801: delete cookies and site data on exit
* 0=keep until they expire (default), 2=keep until you close Firefox
* [SETTING] Privacy & Security>Cookies and Site Data>Delete cookies and site data when Firefox is closed
* [SETTING] to add site exceptions: Ctrl+I>Permissions>Cookies>Allow
* If using FPI the syntax must be https://example.com/^firstPartyDomain=example.com
* [SETTING] to manage site exceptions: Options>Privacy & Security>Permissions>Settings ***/
user_pref("network.cookie.lifetimePolicy", 2);
/* 2802: delete cache on exit [FF96+]
* [NOTE] We already disable disk cache (1001) and clear on exit (2811) which is more robust
* [1] https://bugzilla.mozilla.org/1671182 ***/
user_pref("privacy.clearsitedata.cache.enabled", true);
/* 2803: set third-party cookies to session-only
* [NOTE] .sessionOnly overrides .nonsecureSessionOnly except when .sessionOnly=false and
* .nonsecureSessionOnly=true. This allows you to keep HTTPS cookies, but session-only HTTP ones
* [1] https://feeding.cloud.geek.nz/posts/tweaking-cookies-for-privacy-in-firefox/ ***/
user_pref("network.cookie.thirdparty.sessionOnly", true);
user_pref("network.cookie.thirdparty.nonsecureSessionOnly", true); // [FF58+]
/** SANITIZE ON SHUTDOWN : ALL OR NOTHING ***/
/* 2810: enable Firefox to clear items on shutdown (2811)
* [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes ***/
user_pref("privacy.sanitize.sanitizeOnShutdown", true);
/* 2811: set/enforce what items to clear on shutdown (if 2810 is true) [SETUP-CHROME]
* sanitizingOnShutdown is all or nothing, it does not allow exceptions (1681701)
* [NOTE] If "history" is true, downloads will also be cleared
* [NOTE] "sessions": Active Logins: refers to HTTP Basic Authentication [1], not logins via cookies
* [NOTE] "offlineApps": Offline Website Data: localStorage, service worker cache, QuotaManager (IndexedDB, asm-cache)
* [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes>Settings
* [1] https://en.wikipedia.org/wiki/Basic_access_authentication ***/
user_pref("privacy.clearOnShutdown.cache", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown.downloads", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown.formdata", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown.history", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown.sessions", true); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown.cookies", true);
user_pref("privacy.clearOnShutdown.offlineApps", true);
user_pref("privacy.clearOnShutdown.siteSettings", true); // [DEFAULT: false] Site Preferences
/* 2812: reset default items to clear with Ctrl-Shift-Del (to match 2811) [SETUP-CHROME]
* This dialog can also be accessed from the menu History>Clear Recent History
* Firefox remembers your last choices. This will reset them when you start Firefox
* [NOTE] Regardless of what you set "downloads" to, as soon as the dialog
* for "Clear Recent History" is opened, it is synced to the same as "history" ***/
user_pref("privacy.cpd.cache", true); // [DEFAULT: true]
user_pref("privacy.cpd.formdata", true); // [DEFAULT: true]
user_pref("privacy.cpd.history", true); // [DEFAULT: true]
user_pref("privacy.cpd.sessions", true); // [DEFAULT: true]
user_pref("privacy.cpd.cookies", true);
user_pref("privacy.cpd.offlineApps", true);
user_pref("privacy.cpd.downloads", true); // not used, see note above
user_pref("privacy.cpd.passwords", true); // [DEFAULT: false] this is not listed
user_pref("privacy.cpd.siteSettings", true); // [DEFAULT: false] Site Preferences
/* 2813: clear Session Restore data when sanitizing on shutdown or manually [FF34+]
* [NOTE] Not needed if Session Restore is not used (0102) or it is already cleared with history (2811)
* [NOTE] privacy.clearOnShutdown.openWindows prevents resuming from crashes (also see 5008)
* [NOTE] privacy.cpd.openWindows has a bug that causes an additional window to open ***/
user_pref("privacy.clearOnShutdown.openWindows", true);
//user_pref("privacy.cpd.openWindows", true);
/* 2814: reset default "Time range to clear" for "Clear Recent History" (2812)
* Firefox remembers your last choice. This will reset the value when you start Firefox
* 0=everything, 1=last hour, 2=last two hours, 3=last four hours, 4=today
* [NOTE] Values 5 (last 5 minutes) and 6 (last 24 hours) are not listed in the dropdown,
* which will display a blank value, and are not guaranteed to work ***/
user_pref("privacy.sanitize.timeSpan", 0);
/*** [SECTION 4000]: FPI (FIRST PARTY ISOLATION)
1278037 - indexedDB (FF51+)
1277803 - favicons (FF52+)
1264562 - OCSP cache (FF52+)
1268726 - Shared Workers (FF52+)
1316283 - SSL session cache (FF52+)
1317927 - media cache (FF53+)
1323644 - HSTS and HPKP (FF54+)
1334690 - HTTP Alternative Services (FF54+)
1334693 - SPDY/HTTP2 (FF55+)
1337893 - DNS cache (FF55+)
1344170 - blob: URI (FF55+)
1300671 - data:, about: URLs (FF55+)
1473247 - IP addresses (FF63+)
1542309 - top-level domain URLs when host is in the public suffix list (FF68+)
1506693 - pdfjs range-based requests (FF68+)
1330467 - site permissions (FF69+)
1534339 - IPv6 (FF73+)
1721858 - WebSocket (FF92+)
***/
user_pref("_user.js.parrot", "4000 syntax error: the parrot's pegged out");
/* 4001: enable First Party Isolation [FF51+]
* [SETUP-WEB] Breaks some cross-origin logins
* [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1260931,1299996 ***/
user_pref("privacy.firstparty.isolate", true);
/* 4002: enforce FPI restriction for window.opener [FF54+]
* [NOTE] Setting this to false may reduce the breakage in 4001
* FF65+ blocks postMessage with targetOrigin "*" if originAttributes don't match. But
* to reduce breakage it ignores the 1st-party domain (FPD) originAttribute [2][3]
* The 2nd pref removes that limitation and will only allow communication if FPDs also match
* [1] https://bugzilla.mozilla.org/1319773#c22
* [2] https://bugzilla.mozilla.org/1492607
* [3] https://developer.mozilla.org/docs/Web/API/Window/postMessage ***/
// user_pref("privacy.firstparty.isolate.restrict_opener_access", true); // [DEFAULT: true]
// user_pref("privacy.firstparty.isolate.block_post_message", true);
/* 4003: enable scheme with FPI [FF78+]
* [NOTE] Experimental: existing data and site permissions are incompatible
* and some site exceptions may not work e.g. HTTPS-only mode (1244) ***/
// user_pref("privacy.firstparty.isolate.use_site", true);
/*** [SECTION 4500]: RFP (RESIST FINGERPRINTING)
RFP covers a wide range of ongoing fingerprinting solutions.
It is an all-or-nothing buy in: you cannot pick and choose what parts you want
[WARNING] DO NOT USE extensions to alter RFP protected metrics
418986 - limit window.screen & CSS media queries (FF41)
[TEST] https://arkenfox.github.io/TZP/tzp.html#screen
1281949 - spoof screen orientation (FF50)
1330890 - spoof timezone as UTC0 (FF55)
1360039 - spoof navigator.hardwareConcurrency as 2 (FF55)
1217238 - reduce precision of time exposed by javascript (FF55)
FF56
1369303 - spoof/disable performance API
1333651 - spoof User Agent & Navigator API
JS: the version is spoofed as ESR, and the OS as Windows 10, OS 10.15, Android 10, or Linux
HTTP Headers: spoofed as Windows or Android
1369319 - disable device sensor API
1369357 - disable site specific zoom
1337161 - hide gamepads from content
1372072 - spoof network information API as "unknown" when dom.netinfo.enabled = true
1333641 - reduce fingerprinting in WebSpeech API
FF57
1369309 - spoof media statistics
1382499 - reduce screen co-ordinate fingerprinting in Touch API
1217290 & 1409677 - enable some fingerprinting resistance for WebGL