forked from yokoffing/Betterfox
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathSecurefox.js
1460 lines (1256 loc) · 87.8 KB
/
Securefox.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
/****************************************************************************
* Securefox *
* "Natura non contristatur" *
* priority: provide sensible security and privacy *
* version: 129 *
* url: https://github.com/yokoffing/Betterfox *
* credit: Most prefs are reproduced and adapted from the arkenfox project *
* credit urL: https://github.com/arkenfox/user.js *
****************************************************************************/
/****************************************************************************
* SECTION: TRACKING PROTECTION *
****************************************************************************/
// PREF: Enhanced Tracking Protection (ETP)
// Tracking Content blocking will strip cookies and block all resource requests to domains listed in Disconnect.me.
// Firefox deletes all stored site data (incl. cookies, browser storage) if the site is a known tracker and hasn’t
// been interacted with in the last 30 days.
// [ALLOWLIST] https://disconnect.me/trackerprotection/unblocked
// [NOTE] FF86: "Strict" tracking protection enables dFPI.
// [1] https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
// [2] https://www.reddit.com/r/firefox/comments/l7xetb/network_priority_for_firefoxs_enhanced_tracking/gle2mqn/?web2x&context=3
//user_pref("privacy.trackingprotection.enabled", true); // enabled with "Strict"
//user_pref("privacy.trackingprotection.pbmode.enabled", true); // DEFAULT
//user_pref("browser.contentblocking.customBlockList.preferences.ui.enabled", false); // DEFAULT
user_pref("browser.contentblocking.category", "strict");
//user_pref("privacy.trackingprotection.socialtracking.enabled", true); // enabled with "Strict"
//user_pref("privacy.socialtracking.block_cookies.enabled", true); // DEFAULT
//user_pref("privacy.trackingprotection.cryptomining.enabled", true); // DEFAULT
//user_pref("privacy.trackingprotection.fingerprinting.enabled", true); // DEFAULT
//user_pref("privacy.trackingprotection.emailtracking.enabled", true); // enabled with "Strict"
//user_pref("network.http.referer.disallowCrossSiteRelaxingDefault", true); // DEFAULT
//user_pref("network.http.referer.disallowCrossSiteRelaxingDefault.pbmode", true); // DEFAULT
//user_pref("network.http.referer.disallowCrossSiteRelaxingDefault.pbmode.top_navigation", true); // DEFAULT
//user_pref("network.http.referer.disallowCrossSiteRelaxingDefault.top_navigation", true); // enabled with "Strict"
//user_pref("privacy.annotate_channels.strict_list.enabled", true); // enabled with "Strict"
//user_pref("privacy.annotate_channels.strict_list.pbmode.enabled", true); // DEFAULT
//user_pref("privacy.fingerprintingProtection", true); // [FF114+] [ETP FF119+] enabled with "Strict"
//user_pref("privacy.fingerprintingProtection.pbmode", true); // DEFAULT
// PREF: query stripping
// Currently uses a small list [1]
// We set the same query stripping list that Brave and LibreWolf uses [2]
// If using uBlock Origin or AdGuard, use filter lists as well [3]
// Query parameters stripped [5]
// [1] https://www.eyerys.com/articles/news/how-mozilla-firefox-improves-privacy-using-query-parameter-stripping-feature
// [2] https://github.com/brave/brave-core/blob/f337a47cf84211807035581a9f609853752a32fb/browser/net/brave_site_hacks_network_delegate_helper.cc
// [3] https://github.com/yokoffing/filterlists#url-tracking-parameters
// [4] https://bugzilla.mozilla.org/show_bug.cgi?id=1706607
// [5] https://firefox.settings.services.mozilla.com/v1/buckets/main/collections/query-stripping/records
//user_pref("privacy.query_stripping.enabled", true); // enabled with "Strict"
//user_pref("privacy.query_stripping.enabled.pbmode", true); // enabled with "Strict"
//user_pref("privacy.query_stripping.strip_list", ""); // DEFAULT
//user_pref("privacy.query_stripping.strip_on_share.enabled", true);
// PREF: allow embedded tweets, Instagram and Reddit posts, and TikTok embeds
// [TEST - reddit embed] https://www.pcgamer.com/amazing-halo-infinite-bugs-are-already-rolling-in/
// [TEST - instagram embed] https://www.ndtv.com/entertainment/bharti-singh-and-husband-haarsh-limbachiyaa-announce-pregnancy-see-trending-post-2646359
// [TEST - tweet embed] https://www.newsweek.com/cryptic-tweet-britney-spears-shows-elton-john-collab-may-date-back-2015-1728036
// [TEST - tiktok embed] https://www.vulture.com/article/snl-adds-four-new-cast-members-for-season-48.html
// [1] https://www.reddit.com/r/firefox/comments/l79nxy/firefox_dev_is_ignoring_social_tracking_preference/gl84ukk
// [2] https://www.reddit.com/r/firefox/comments/pvds9m/reddit_embeds_not_loading/
user_pref("urlclassifier.trackingSkipURLs", "*.reddit.com, *.twitter.com, *.twimg.com, *.tiktok.com"); // MANUAL
user_pref("urlclassifier.features.socialtracking.skipURLs", "*.instagram.com, *.twitter.com, *.twimg.com"); // MANUAL
// PREF: lower the priority of network loads for resources on the tracking protection list [NIGHTLY]
// [1] https://github.com/arkenfox/user.js/issues/102#issuecomment-298413904
//user_pref("privacy.trackingprotection.lower_network_priority", true);
// PREF: Site Isolation (sandboxing) [FF100+]
// [ABOUT] View in about:processes.
// Site Isolation (Fission) builds upon a new security architecture that extends current
// protection mechanisms by separating web content and loading each site
// in its own operating system process. This new security architecture allows
// Firefox to completely separate code originating from different sites and, in turn,
// defend against malicious sites trying to access sensitive information from other sites you are visiting.
// [1] https://hacks.mozilla.org/2021/05/introducing-firefox-new-site-isolation-security-architecture/
// [2] https://hacks.mozilla.org/2022/05/improved-process-isolation-in-firefox-100/
// [3] https://hacks.mozilla.org/2021/12/webassembly-and-back-again-fine-grained-sandboxing-in-firefox-95/
// [4] https://www.reddit.com/r/firefox/comments/r69j52/firefox_content_process_limit_is_gone/
// [5] https://hg.mozilla.org/mozilla-central/file/tip/dom/ipc/ProcessIsolation.cpp#l53
//user_pref("fission.autostart", true); // DEFAULT [DO NOT TOUCH]
//user_pref("fission.webContentIsolationStrategy", 1); // DEFAULT
// PREF: GPU sandboxing [FF110+] [WINDOWS]
// [1] https://www.ghacks.net/2023/01/17/firefox-110-will-launch-with-gpu-sandboxing-on-windows/
// [2] https://techdows.com/2023/02/disable-gpu-sandboxing-firefox.html
// 0=disabled, 1=enabled (default)
//user_pref("security.sandbox.gpu.level", 1); // DEFAULT WINDOWS
// PREF: State Partitioning [Dynamic First-Party Isolation (dFPI), Total Cookie Protection (TCP)]
// Firefox manages client-side state (i.e., data stored in the browser) to mitigate the ability of websites to abuse state
// for cross-site tracking. This effort aims to achieve that by providing what is effectively a "different", isolated storage
// location to every website a user visits.
// dFPI is a more web-compatible version of FPI, which double keys all third-party state by the origin of the top-level
// context. dFPI isolates user's browsing data for each top-level eTLD+1, but is flexible enough to apply web
// compatibility heuristics to address resulting breakage by dynamically modifying a frame's storage principal.
// dFPI isolates most sites while applying heuristics to allow sites through the isolation in certain circumstances for usability.
// [NOTE] dFPI partitions all of the following caches by the top-level site being visited: HTTP cache, image cache,
// favicon cache, HSTS cache, OCSP cache, style sheet cache, font cache, DNS cache, HTTP Authentication cache,
// Alt-Svc cache, and TLS certificate cache.
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1549587
// [2] https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Privacy/State_Partitioning
// [3] https://blog.mozilla.org/security/2021/02/23/total-cookie-protection/
// [4] https://blog.mozilla.org/en/mozilla/firefox-rolls-out-total-cookie-protection-by-default-to-all-users-worldwide/
// [5] https://hacks.mozilla.org/2021/02/introducing-state-partitioning/
// [6] https://github.com/arkenfox/user.js/issues/1281
// [7] https://hacks.mozilla.org/2022/02/improving-the-storage-access-api-in-firefox/
//user_pref("network.cookie.cookieBehavior", 5); // DEFAULT FF103+
//user_pref("browser.contentblocking.reject-and-isolate-cookies.preferences.ui.enabled", true); // DEFAULT
// PREF: Network Partitioning
// Networking-related APIs are not intended to be used for websites to store data, but they can be abused for
// cross-site tracking. Network APIs and caches are permanently partitioned by the top-level site.
// Network Partitioning (isolation) will allow Firefox to associate resources on a per-website basis rather than together
// in the same pool. This includes cache, favicons, CSS files, images, and even speculative connections.
// [1] https://www.zdnet.com/article/firefox-to-ship-network-partitioning-as-a-new-anti-tracking-defense/
// [2] https://developer.mozilla.org/en-US/docs/Web/Privacy/State_Partitioning#network_partitioning
// [3] https://blog.mozilla.org/security/2021/01/26/supercookie-protections/
//user_pref("privacy.partition.network_state", true); // DEFAULT
//user_pref("privacy.partition.serviceWorkers", true); // [DEFAULT: true FF105+]
//user_pref("privacy.partition.network_state.ocsp_cache", true); // enabled with "Strict" [DEFAULT: true FF123+]
//user_pref("privacy.partition.bloburl_per_partition_key", true); // [FF118+]
// enable APS (Always Partitioning Storage) [FF104+]
//user_pref("privacy.partition.always_partition_third_party_non_cookie_storage", true); // [DEFAULT: true FF109+]
//user_pref("privacy.partition.always_partition_third_party_non_cookie_storage.exempt_sessionstorage", false); // [DEFAULT: false FF109+]
// PREF: Smartblock
// [1] https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection
// [2] https://www.youtube.com/watch?v=VE8SrClOTgw
// [3] https://searchfox.org/mozilla-central/source/browser/extensions/webcompat/data/shims.js
//user_pref("extensions.webcompat.enable_shims", true); // enabled with "Strict"
// PREF: Redirect Tracking Prevention / Cookie Purging
// All storage is cleared (more or less) daily from origins that are known trackers and that
// haven’t received a top-level user interaction (including scroll) within the last 45 days.
// [1] https://www.ghacks.net/2020/08/06/how-to-enable-redirect-tracking-in-firefox/
// [2] https://www.cookiestatus.com/firefox/#other-first-party-storage
// [3] https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Privacy/Redirect_tracking_protection
// [4] https://www.ghacks.net/2020/03/04/firefox-75-will-purge-site-data-if-associated-with-tracking-cookies/
// [5] https://github.com/arkenfox/user.js/issues/1089
// [6] https://firefox-source-docs.mozilla.org/toolkit/components/antitracking/anti-tracking/cookie-purging/index.html
//user_pref("privacy.purge_trackers.enabled", true); // DEFAULT
// PREF: Bounce Tracking Protection [FF127+]
// A new standardised variant of Cookie Purging that uses heuristics to detect bounce trackers,
// rather than relying on tracker lists.
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1895222
// [2] https://groups.google.com/a/mozilla.org/g/dev-platform/c/M6erM0SjPTM
//user_pref("privacy.bounceTrackingProtection.enabled", true);
//user_pref("privacy.bounceTrackingProtection.enableDryRunMode", false); // false enables tracker data purging
// PREF: SameSite Cookies
// Currently, the absence of the SameSite attribute implies that cookies will be
// attached to any request for a given origin, no matter who initiated that request.
// This behavior is equivalent to setting SameSite=None.
// So the pref allows the lack of attribution, or SameSite=None, only on HTTPS sites
// to prevent CSFRs on plaintext sites.
// [1] https://hacks.mozilla.org/2020/08/changes-to-samesite-cookie-behavior/
// [2] https://caniuse.com/?search=samesite
// [3] https://github.com/arkenfox/user.js/issues/1640#issuecomment-1464093950
// [4] https://support.mozilla.org/en-US/questions/1364032
// [5] https://blog.mozilla.org/security/2018/04/24/same-site-cookies-in-firefox-60/
// [6] https://web.dev/samesite-cookies-explained/
// [7] https://portswigger.net/web-security/csrf/bypassing-samesite-restrictions
// [8] https://developer.mozilla.org/en-US/docs/Web/HTTP/Cookies
// [TEST] https://samesite-sandbox.glitch.me/
//user_pref("network.cookie.sameSite.laxByDefault", true);
user_pref("network.cookie.sameSite.noneRequiresSecure", true);
//user_pref("network.cookie.sameSite.schemeful", true);
// PREF: Hyperlink Auditing (click tracking)
//user_pref("browser.send_pings", false); // DEFAULT
// PREF: Beacon API
// Allows websites to asynchronously transmit small amounts of data to servers
// without impacting page load performance. This allows things like activity tracking
// to be done reliably in the background. Other tracking methods like form submissions
// and XHR requests already allow similar capabilities but hurt performance.
// Disabling the Beacon API wouldn't make the data unavailable - sites could still
// collect it synchronously instead.
// [NOTE] Disabling this API sometimes causes site breakage.
// [TEST] https://vercel.com/
// [1] https://developer.mozilla.org/docs/Web/API/Navigator/sendBeacon
// [2] https://github.com/arkenfox/user.js/issues/1586
//user_pref("beacon.enabled", false);
// PREF: battery status tracking
// [NOTE] Pref remains, but API is depreciated.
// [1] https://developer.mozilla.org/en-US/docs/Web/API/Battery_Status_API#browser_compatibility
//user_pref("dom.battery.enabled", false);
// PREF: remove temp files opened from non-PB windows with an external application
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=302433,1738574
// [2] https://github.com/arkenfox/user.js/issues/1732
user_pref("browser.download.start_downloads_in_tmp_dir", true); // [FF102+]
user_pref("browser.helperApps.deleteTempFileOnExit", true);
// PREF: disable UITour backend
// This way, there is no chance that a remote page can use it.
user_pref("browser.uitour.enabled", false);
//user_pref("browser.uitour.url", "");
// PREF: disable remote debugging
// [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16222
//user_pref("devtools.debugger.remote-enabled", false); // DEFAULT
// PREF: Global Privacy Control (GPC) [FF118+]
// A privacy signal that tells the websites that the user
// doesn’t want to be tracked and doesn’t want their data to be sold.
// Honored by many highly ranked sites [3].
// [SETTING] Privacy & Security > Website Privacy Preferences > Tell websites not to sell or share my data
// [TEST] https://global-privacy-control.glitch.me/
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1830623
// [2] https://globalprivacycontrol.org/press-release/20201007.html
// [3] https://github.com/arkenfox/user.js/issues/1542#issuecomment-1279823954
// [4] https://blog.mozilla.org/netpolicy/2021/10/28/implementing-global-privacy-control/
// [5] https://help.duckduckgo.com/duckduckgo-help-pages/privacy/gpc/
// [6] https://brave.com/web-standards-at-brave/4-global-privacy-control/
// [7] https://www.eff.org/gpc-privacy-badger
// [8] https://www.eff.org/issues/do-not-track
user_pref("privacy.globalprivacycontrol.enabled", true);
//user_pref("privacy.globalprivacycontrol.functionality.enabled", true); // [FF120+]
//user_pref("privacy.globalprivacycontrol.pbmode.enabled", true); // [FF120+]
/****************************************************************************
* SECTION: OSCP & CERTS / HPKP (HTTP Public Key Pinning) *
****************************************************************************/
// Online Certificate Status Protocol (OCSP)
// OCSP leaks your IP and domains you visit to the CA when OCSP Stapling is not available on visited host.
// OCSP is vulnerable to replay attacks when nonce is not configured on the OCSP responder.
// Short-lived certificates are not checked for revocation (security.pki.cert_short_lifetime_in_days, default:10).
// Firefox falls back on plain OCSP when must-staple is not configured on the host certificate.
// [1] https://scotthelme.co.uk/revocation-is-broken/
// [2] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
// [3] https://github.com/arkenfox/user.js/issues/1576#issuecomment-1304590235
// PREF: disable OCSP fetching to confirm current validity of certificates
// 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).
// Unlike Chrome, Firefox’s default settings also query OCSP responders to confirm the validity
// of SSL/TLS certificates. However, because OCSP query failures are so common, Firefox
// (like other browsers) implements a “soft-fail” policy.
// [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
// [2] https://www.ssl.com/blogs/how-do-browsers-handle-revoked-ssl-tls-certificates/#ftoc-heading-3
// 0=disabled, 1=enabled (default), 2=enabled for EV certificates only
user_pref("security.OCSP.enabled", 0);
// PREF: set OCSP fetch failures to hard-fail
// 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)
// [WARNING] Expect breakage:
// security.OCSP.require will make the connection fail when the OCSP responder is unavailable
// security.OCSP.require is known to break browsing on some captive portals
// [1] https://blog.mozilla.org/security/2013/07/29/ocsp-stapling-in-firefox/
// [2] https://www.imperialviolet.org/2014/04/19/revchecking.html
// [3] https://www.ssl.com/blogs/how-do-browsers-handle-revoked-ssl-tls-certificates/#ftoc-heading-3
//user_pref("security.OCSP.require", true);
// PREF: CRLite
// CRLite covers valid certs, and it doesn't fall back to OCSP in mode 2 [FF84+].
// CRLite is faster and more private than OCSP [2].
// 0 = disabled
// 1 = consult CRLite but only collect telemetry
// 2 = consult CRLite and enforce both "Revoked" and "Not Revoked" results
// 3 = consult CRLite and enforce "Not Revoked" results, but defer to OCSP for "Revoked" [FF99+, default FF100+]
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1429800,1670985,1753071
// [2] https://blog.mozilla.org/security/tag/crlite/
user_pref("security.remote_settings.crlite_filters.enabled", true);
user_pref("security.pki.crlite_mode", 2);
// PREF: HTTP Public Key Pinning (HPKP)
// HPKP enhances the security of SSL certificates by associating
// a host with their expected public key. It prevents attackers
// from impersonating the host using fraudulent certificates,
// even if they hold a valid certificate from a trusted certification authority.
// HPKP ensures that the client maintains a secure connection with
// the correct server, thereby reducing the risk of man-in-the-middle (MITM) attacks.
// [NOTE] If you rely on an antivirus to protect your web browsing
// by inspecting ALL your web traffic, then leave at 1.
// [ERROR] MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE
// By default, pinning enforcement is not applied if a user-installed
// certificate authority (CA) is present. However, this allows user-installed
// CAs to override pins for any site, negating the security benefits of HPKP.
// 0=disabled, 1=allow user MiTM (such as your antivirus) (default), 2=strict
// [1] https://gitlab.torproject.org/tpo/applications/tor-browser/-/issues/16206
// [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1168603
// [3] https://github.com/yokoffing/Betterfox/issues/53#issuecomment-1035554783
//user_pref("security.cert_pinning.enforcement_level", 2);
// PREF: do not trust installed third-party root certificates [FF120+]
// Disable Enterprise Root Certificates of the operating system.
// For users trying to get intranet sites on managed networks,
// or who have security software configured to analyze web traffic.
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1848815
//user_pref("security.enterprise_roots.enabled", false);
//user_pref("security.certerrors.mitm.auto_enable_enterprise_roots", false);
// PREF: disable content analysis by DLP (Data Loss Prevention) agents [FF124+]
// DLP agents are background processes on managed computers that allow enterprises to monitor locally running
// applications for data exfiltration events, which they can allow/block based on customer defined DLP policies.
// [1] https://github.com/chromium/content_analysis_sdk
// [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1880314
//user_pref("browser.contentanalysis.enabled", false); // [FF121+] [DEFAULT]
//user_pref("browser.contentanalysis.default_result", 0; // [FF127+] [DEFAULT]
/****************************************************************************
* SECTION: SSL (Secure Sockets Layer) / TLS (Transport Layer Security) *
****************************************************************************/
// PREF: display warning on the padlock for "broken security"
// [NOTE] 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);
// PREF: require safe negotiation
// [ERROR] SSL_ERROR_UNSAFE_NEGOTIATION
// [WARNING] Breaks ea.com login (Sep 2023).
// Blocks connections to servers that don't support RFC 5746 [2]
// as they're potentially vulnerable to a MiTM attack [3].
// A server without RFC 5746 can be safe from the attack if it
// disables renegotiations but the problem is that the browser can't
// know that. Setting this pref to true is the only way for the
// browser to ensure there will be no unsafe renegotiations on
// the channel between the browser and the server.
// [STATS] SSL Labs > Renegotiation Support (May 2024) reports over 99.7% of top sites have secure renegotiation [4].
// [1] https://wiki.mozilla.org/Security:Renegotiation
// [2] https://datatracker.ietf.org/doc/html/rfc5746
// [3] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3555
// [4] https://www.ssllabs.com/ssl-pulse/
//user_pref("security.ssl.require_safe_negotiation", true);
// PREF: display advanced information on Insecure Connection warning pages
// [TEST] https://expired.badssl.com/
user_pref("browser.xul.error_pages.expert_bad_cert", true);
// PREF: disable 0-RTT (round-trip time) to improve TLS 1.3 security [FF51+]
// This data is not forward secret, as it is encrypted solely under keys derived using
// the offered PSK. There are no guarantees of non-replay between connections.
// [1] https://github.com/tlswg/tls13-spec/issues/1001
// [2] https://www.rfc-editor.org/rfc/rfc9001.html#name-replay-attacks-with-0-rtt
// [3] https://blog.cloudflare.com/tls-1-3-overview-and-q-and-a/
user_pref("security.tls.enable_0rtt_data", false);
/****************************************************************************
* SECTION: FINGERPRINT PROTECTION (FPP) *
****************************************************************************/
// PREF: enable FingerPrint Protection (FPP) [WiP]
// [1] https://github.com/arkenfox/user.js/issues/1661
// [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1816064
//user_pref("privacy.resistFingerprinting.randomization.daily_reset.enabled", true);
//user_pref("privacy.resistFingerprinting.randomization.daily_reset.private.enabled", true);
/****************************************************************************
* SECTION: RESIST FINGERPRINTING (RFP) *
****************************************************************************/
// PREF: enable advanced fingerprinting protection (RFP)
// [WARNING] Leave disabled unless you're okay with all the drawbacks
// [1] https://librewolf.net/docs/faq/#what-are-the-most-common-downsides-of-rfp-resist-fingerprinting
// [2] https://www.reddit.com/r/firefox/comments/wuqpgi/comment/ile3whx/?context=3
//user_pref("privacy.resistFingerprinting", true);
// PREF: set new window size rounding max values [FF55+]
// [SETUP-CHROME] sizes round down in hundreds: width to 200s and height to 100s, to fit your screen
// [1] https://bugzilla.mozilla.org/1330882
//user_pref("privacy.window.maxInnerWidth", 1600);
//user_pref("privacy.window.maxInnerHeight", 900);
// PREF: disable showing about:blank as soon as possible during startup [FF60+]
// [1] https://github.com/arkenfox/user.js/issues/1618
// [2] https://bugzilla.mozilla.org/1448423
//user_pref("browser.startup.blankWindow", false);
// PREF: disable ICC color management
// Use a color calibrator for best results [WINDOWS]
// Also may help improve font rendering on WINDOWS
// [SETTING] General>Language and Appearance>Fonts and Colors>Colors>Use system colors
// default=false NON-WINDOWS
// [1] https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/3.5/ICC_color_correction_in_Firefox
//user_pref("browser.display.use_system_colors", false);
/****************************************************************************
* SECTION: DISK AVOIDANCE *
****************************************************************************/
// PREF: prevent 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);
// PREF: minimum interval (in ms) between session save operations
// Firefox periodically saves the user's session so it can restore
// their most recent tabs and windows if the browser crashes or restarts.
// The value sets the minimum time between these session save operations.
// Firefox only saves session data when the state has changed since the last save [2].
// Work has been done to mitigate potential performance drawbacks of frequent session saving [3].
// [1] https://kb.mozillazine.org/Browser.sessionstore.interval
// [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1304389#c64
// [3] https://bugzilla.mozilla.org/show_bug.cgi?id=1304389#c66
user_pref("browser.sessionstore.interval", 60000); // 1 minute; default=15000 (15s); 900000=15 min; 1800000=30 min
// PREF: store extra session data when crashing or restarting to install updates
// Dictates whether sites may save extra session data such as form content,
// scrollbar positions, and POST data.
// 0=everywhere (default), 1=unencrypted sites, 2=nowhere
//user_pref("browser.sessionstore.privacy_level", 2);
// PREF: disable automatic Firefox start and session restore after reboot [WINDOWS]
// [1] https://bugzilla.mozilla.org/603903
//user_pref("toolkit.winRegisterApplicationRestart", false);
// PREF: disable favicons in shortcuts [WINDOWS]
// Fetches and stores favicons for Windows .URL shortcuts created by drag and drop
// [NOTE] .URL shortcut files will be created with a generic icon.
// Favicons are stored as .ico files in profile_dir\shortcutCache.
//user_pref("browser.shell.shortcutFavicons", false);
// PREF: remove temp files opened with an external application
// [1] https://bugzilla.mozilla.org/302433
//user_pref("browser.helperApps.deleteTempFileOnExit", true); // DEFAULT [FF108]
// PREF: disable page thumbnails capturing
// Page thumbnails are only used in chrome/privileged contexts.
//user_pref("browser.pagethumbnails.capturing_disabled", true); // [HIDDEN PREF]
/******************************************************************************
* SECTION: SANITIZE HISTORY *
******************************************************************************/
// PREF: reset default 'Time range to clear' for "Clear Data" and "Clear History"
// 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, 5=last five minutes, 6=last twenty-four hours
// The values 5 + 6 are not listed in the dropdown, which will display a
// blank value if they are used, but they do work as advertised.
//user_pref("privacy.sanitize.timeSpan", 0);
// PREF: sanitize site data: set manual "Clear Data" items [FF128+]
// Firefox remembers your last choices. This will reset them when you start Firefox
// [SETTING] Privacy & Security>Browser Privacy>Cookies and Site Data>Clear Data
//user_pref("privacy.clearSiteData.cache", true);
//user_pref("privacy.clearSiteData.cookiesAndStorage", false); // keep false until it respects "allow" site exceptions
//user_pref("privacy.clearSiteData.historyFormDataAndDownloads", true);
//user_pref("privacy.clearSiteData.siteSettings", false);
// PREF: sanitize history: set manual "Clear History" items, also via Ctrl-Shift-Del | clearHistory migration is FF128+
// Firefox remembers your last choices. This will reset them when you start Firefox.
// [NOTE] Regardless of what you set "downloads" to, as soon as the dialog
// for "Clear Recent History" is opened, it is synced to the same as "history".
// [SETTING] Privacy & Security>History>Custom Settings>Clear History
//user_pref("privacy.cpd.cache", true); // [DEFAULT]
//user_pref("privacy.clearHistory.cache", true);
//user_pref("privacy.cpd.formdata", true); // [DEFAULT]
//user_pref("privacy.cpd.history", true); // [DEFAULT]
//user_pref("privacy.cpd.downloads", true); // not used; see note above
//user_pref("privacy.clearHistory.historyFormDataAndDownloads", true);
//user_pref("privacy.cpd.cookies", false);
//user_pref("privacy.cpd.sessions", true); // [DEFAULT]
//user_pref("privacy.cpd.offlineApps", false); // [DEFAULT]
//user_pref("privacy.clearHistory.cookiesAndStorage", false);
//user_pref("privacy.cpd.openWindows", false); // Session Restore
//user_pref("privacy.cpd.passwords", false);
//user_pref("privacy.cpd.siteSettings", false);
//user_pref("privacy.clearHistory.siteSettings", false);
/******************************************************************************
* SECTION: SHUTDOWN & SANITIZING *
******************************************************************************/
// PREF: set History section to show all options
// Settings>Privacy>History>Use custom settings for history
// [INFOGRAPHIC] https://bugzilla.mozilla.org/show_bug.cgi?id=1765533#c1
user_pref("privacy.history.custom", true);
// PREF: clear browsing data on shutdown, while respecting site exceptions
// Set cookies, site data, cache, etc. to clear on shutdown.
// [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes>Settings
// [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)
// Clearing "offlineApps" may affect login items after browser restart [2].
// [1] https://en.wikipedia.org/wiki/Basic_access_authentication
// [2] https://github.com/arkenfox/user.js/issues/1291
// [3] https://github.com/yokoffing/Betterfox/issues/272
//user_pref("privacy.sanitize.sanitizeOnShutdown", true);
// PREF: sanitize on shutdown: no site exceptions | v2 migration [FF128+]
// [NOTE] If "history" is true, downloads will also be cleared.
//user_pref("privacy.clearOnShutdown.cache", true); // [DEFAULT]
//user_pref("privacy.clearOnShutdown_v2.cache", true); // [FF128+] [DEFAULT]
//user_pref("privacy.clearOnShutdown.downloads", true); // [DEFAULT]
//user_pref("privacy.clearOnShutdown.formdata", true); // [DEFAULT]
//user_pref("privacy.clearOnShutdown.history", true); // [DEFAULT]
//user_pref("privacy.clearOnShutdown_v2.historyFormDataAndDownloads", true); // [FF128+] [DEFAULT]
//user_pref("privacy.clearOnShutdown.siteSettings", false); // [DEFAULT]
//user_pref("privacy.clearOnShutdown_v2.siteSettings", false); // [FF128+] [DEFAULT]
// PREF: set Session Restore to clear on shutdown [FF34+]
// [NOTE] Not needed if Session Restore is not used or it is already cleared with history (2811)
// [NOTE] However, if true, this pref prevents resuming from crashes.
//user_pref("privacy.clearOnShutdown.openWindows", true);
// PREF: sanitize on shutdown: respects allow site exceptions | v2 migration [FF128+]
// Set cookies, site data, cache, etc. to clear on shutdown.
// [SETTING] Privacy & Security>History>Custom Settings>Clear history when Firefox closes>Settings
// [NOTE] "sessions": Active Logins (has no site exceptions): refers to HTTP Basic Authentication [1], not logins via cookies.
// [NOTE] "offlineApps": Offline Website Data: localStorage, service worker cache, QuotaManager (IndexedDB, asm-cache).
// Clearing "offlineApps" may affect login items after browser restart.
// [1] https://en.wikipedia.org/wiki/Basic_access_authentication
//user_pref("privacy.clearOnShutdown.cookies", true); // Cookies
//user_pref("privacy.clearOnShutdown.offlineApps", true); // Site Data
//user_pref("privacy.clearOnShutdown.sessions", true); // Active Logins [DEFAULT]
//user_pref("privacy.clearOnShutdown_v2.cookiesAndStorage", true); // Cookies, Site Data, Active Logins [FF128+]
// PREF: configure site exceptions
// [NOTE] Currently, there is no way to add sites via about:config.
// [SETTING] to add site exceptions: Ctrl+I>Permissions>Cookies>Allow (when on the website in question)
// [SETTING] To manage site exceptions: Options>Privacy & Security>Cookies & Site Data>Manage Exceptions
// [NOTE] Exceptions: A "cookie" permission also controls "offlineApps" (see note below). For cross-domain logins,
// add exceptions for both sites e.g. https://www.youtube.com (site) + https://accounts.google.com (single sign on)
// [WARNING] Be selective with what cookies you keep, as they also disable partitioning [1]
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1767271
/******************************************************************************
* SECTION: SEARCH / URL BAR *
******************************************************************************/
// PREF: darken certain parts of the URL [FF75+]
// Makes the domain name more prominent by graying out other parts of the URL.
// Also hidse https:// and www parts from the suggestion URL.
// [1] https://udn.realityripple.com/docs/Mozilla/Preferences/Preference_reference/browser.urlbar.trimURLs
// [2] https://winaero.com/firefox-75-strips-https-and-www-from-address-bar-results/
//user_pref("browser.urlbar.trimURLs", true); // DEFAULT
// PREF: trim HTTPS from the URL bar [FF119+]
// Firefox will hide https:// from the address bar, but not subdomains like www.
// It saves some space. Betterfox already uses HTTPS-by-Default and insecure sites
// get a padlock with a red stripe. Copying the URL still copies the scheme,
// so it's not like we need to see https. It's not a privacy issue, so you can add to your overrides.
// [TEST] http://www.http2demo.io/
// [1] https://www.ghacks.net/2023/09/19/firefox-119-will-launch-with-an-important-address-bar-change/
user_pref("browser.urlbar.trimHttps", true);
user_pref("browser.urlbar.untrimOnUserInteraction.featureGate", true);
// PREF: display "Not Secure" text on HTTP sites
// Needed with HTTPS-First Policy; not needed with HTTPS-Only Mode.
user_pref("security.insecure_connection_text.enabled", true);
user_pref("security.insecure_connection_text.pbmode.enabled", true);
// PREF: do not show search terms in URL bar [FF110+]
// Show search query instead of URL on search results pages.
// [SETTING] Search>Search Bar>Use the address bar for search and navigation>Show search terms instead of URL...
//user_pref("browser.urlbar.showSearchTerms.enabled", false);
//user_pref("browser.urlbar.showSearchTerms.featureGate", false); // DEFAULT
// PREF: enable seperate search engine for Private Windows
// [SETTINGS] Preferences>Search>Default Search Engine>"Use this search engine in Private Windows"
user_pref("browser.search.separatePrivateDefault.ui.enabled", true);
// [SETTINGS] "Choose a different default search engine for Private Windows only"
//user_pref("browser.search.separatePrivateDefault", true); // DEFAULT
// PREF: enable option to add custom search engine
// [SETTINGS] Settings -> Search -> Search Shortcuts -> Add
// [EXAMPLE] https://search.brave.com/search?q=%s
// [EXAMPLE] https://lite.duckduckgo.com/lite/?q=%s
// [1] https://reddit.com/r/firefox/comments/xkzswb/adding_firefox_search_engine_manually/
user_pref("browser.urlbar.update2.engineAliasRefresh", true); // HIDDEN
// PREF: disable live search suggestions (Google, Bing, etc.)
// [WARNING] Search engines keylog every character you type from the URL bar.
// Override these if you trust and use a privacy respecting search engine.
// [NOTE] Both prefs must be true for live search to work in the location bar.
// [SETTING] Search>Provide search suggestions > Show search suggestions in address bar result
user_pref("browser.search.suggest.enabled", false);
//user_pref("browser.search.suggest.enabled.private", false); // DEFAULT
user_pref("browser.urlbar.suggest.searches", false);
// PREF: disable Firefox Suggest
// [1] https://github.com/arkenfox/user.js/issues/1257
user_pref("browser.urlbar.quicksuggest.enabled", false); // controls whether the UI is shown
user_pref("browser.urlbar.suggest.quicksuggest.sponsored", false); // [FF92+]
user_pref("browser.urlbar.suggest.quicksuggest.nonsponsored", false); // [FF95+]
// hide Firefox Suggest label in URL dropdown box
user_pref("browser.urlbar.groupLabels.enabled", false);
// PREF: disable search and form history
// Be aware that autocomplete form data can be read by third parties [1][2].
// Form data can easily be stolen by third parties.
// [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);
// PREF: URL 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); // [DEFAULT FF104+]
// PREF: disable location bar autofill
// https://support.mozilla.org/en-US/kb/address-bar-autocomplete-firefox#w_url-autocomplete
//user_pref("browser.urlbar.autoFill", false);
// PREF: enforce Punycode for Internationalized Domain Names to eliminate possible spoofing
// Firefox has some protections, but it is better to be safe than sorry.
// [!] Might be undesirable for non-latin alphabet users since legitimate IDN's are also punycoded.
// [EXAMPLE] https://www.techspot.com/news/100555-malvertising-attack-uses-punycode-character-spread-malware-through.html
// [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] CVE-2017-5383: https://www.mozilla.org/security/advisories/mfsa2017-02/
// [4] https://www.xudongz.com/blog/2017/idn-phishing/
user_pref("network.IDN_show_punycode", true);
/******************************************************************************
* SECTION: HTTPS-FIRST POLICY *
******************************************************************************/
// PREF: HTTPS-First Policy
// Firefox attempts to make all connections to websites secure,
// and falls back to insecure connections only when a website
// does not support it. Unlike HTTPS-Only Mode, Firefox
// will NOT ask for your permission before connecting to a website
// that doesn’t support secure connections.
// As of August 2023, Google estimates that 5-10% of traffic
// has remained on HTTP, allowing attackers to eavesdrop
// on or change that data [6].
// [NOTE] HTTPS-Only Mode needs to be disabled for HTTPS First to work.
// [TEST] http://example.com [upgrade]
// [TEST] http://httpforever.com/ [no upgrade]
// [1] https://blog.mozilla.org/security/2021/08/10/firefox-91-introduces-https-by-default-in-private-browsing/
// [2] https://brave.com/privacy-updates/22-https-by-default/
// [3] https://github.com/brave/adblock-lists/blob/master/brave-lists/https-upgrade-exceptions-list.txt
// [4] https://web.dev/why-https-matters/
// [5] https://www.cloudflare.com/learning/ssl/why-use-https/
// [6] https://blog.chromium.org/2023/08/towards-https-by-default.html
user_pref("dom.security.https_first", true); // [DEFAULT FF129+]
//user_pref("dom.security.https_first_pbm", true); // [DEFAULT FF91+]
//user_pref("dom.security.https_first_schemeless", true); // [FF120+] [DEFAULT FF129+]
/******************************************************************************
* SECTION: HTTPS-ONLY MODE *
******************************************************************************/
// Firefox displays a warning page if HTTPS is not supported
// by a server. Options to use HTTP are then provided.
// [NOTE] When "https_only_mode" (all windows) is true,
// "https_only_mode_pbm" (private windows only) is ignored.
// As of August 2023, Google estimates that 5-10% of traffic
// has remained on HTTP, allowing attackers to eavesdrop
// on or change that data [5].
// [SETTING] to add site exceptions: Padlock>HTTPS-Only mode>On/Off/Off temporarily
// [SETTING] Privacy & Security>HTTPS-Only Mode
// [TEST] http://example.com [upgrade]
// [TEST] http://httpforever.com/ [no upgrade]
// [1] https://bugzilla.mozilla.org/1613063
// [2] https://blog.mozilla.org/security/2020/11/17/firefox-83-introduces-https-only-mode/
// [3] https://web.dev/why-https-matters/
// [4] https://www.cloudflare.com/learning/ssl/why-use-https/
// [5] https://blog.chromium.org/2023/08/towards-https-by-default.html
// PREF: enable HTTPS-only Mode
//user_pref("dom.security.https_only_mode_pbm", true); // Private Browsing windows only
//user_pref("dom.security.https_only_mode", true); // Normal + Private Browsing windows
// PREF: offer suggestion for HTTPS site when available
// [1] https://x.com/leli_gibts_scho/status/1371463866606059528
user_pref("dom.security.https_only_mode_error_page_user_suggestions", true);
// PREF: HTTP background requests in HTTPS-only Mode
// When attempting to upgrade, if the server doesn't respond within 3 seconds[=default time],
// 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.
// Firefox only sends top level domain when falling back to http.
// [WARNING] Disabling causes long timeouts when no path to HTTPS is present.
// [NOTE] Use "Manage Exceptions" for sites known for no HTTPS.
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1642387,1660945
// [2] https://blog.mozilla.org/attack-and-defense/2021/03/10/insights-into-https-only-mode/
//user_pref("dom.security.https_only_mode_send_http_background_request", true); // DEFAULT
//user_pref("dom.security.https_only_fire_http_request_background_timer_ms", 3000); // DEFAULT
// PREF: disable HTTPS-Only mode for local resources
//user_pref("dom.security.https_only_mode.upgrade_local", false); // DEFAULT
/******************************************************************************
* SECTION: DNS-over-HTTPS *
******************************************************************************/
// PREF: DNS-over-HTTPS (DoH) implementation
// [NOTE] Mode 3 has site exceptions with a nice UI on the error page.
// [SETTINGS] Privacy & Security > DNS over HTTPS > Enable secure DNS using:
// [NOTE] Mode 3 has site-exceptions with a nice UI on the error page.
// [1] https://hacks.mozilla.org/2018/05/a-cartoon-intro-to-dns-over-https/
// [2] https://wiki.mozilla.org/Security/DOH-resolver-policy
// [3] https://support.mozilla.org/en-US/kb/dns-over-https#w_protection-levels-explained
// 0= Default Protection: Firefox decides when to use secure DNS (default)
// 2= Increased Protection: use DoH and fall back to native DNS if necessary
// 3= Max Protection: only use DoH; do not fall back to native DNS
// 5= Off: disable DoH
//user_pref("network.trr.mode", 0); // DEFAULT
// PREF: lower max attempts to use DoH
// If DNS requests take too long, FF will fallback to your default DNS much quicker.
//user_pref("network.trr.max-fails", 5); // default=15
// PREF: display fallback warning page [FF115+]
// Show a warning checkbox UI in modes 0 or 2 above.
//user_pref("network.trr_ui.show_fallback_warning_option", false); // DEFAULT
//user_pref("network.trr.display_fallback_warning", false); // DEFAULT
// PREF: DoH resolver
// [1] https://github.com/uBlockOrigin/uBlock-issues/issues/1710
//user_pref("network.trr.uri", "https://xxxx/dns-query");
//user_pref("network.trr.custom_uri", "https://xxxx/dns-query");
// PREF: set DoH bootstrap address [FF89+]
// Firefox uses the system DNS to initially resolve the IP address of your DoH server.
// When set to a valid, working value that matches your "network.trr.uri" Firefox
// won't use the system DNS. If the IP doesn't match then DoH won't work
//user_pref("network.trr.bootstrapAddr", "10.0.0.1"); // [HIDDEN PREF]
// PREF: adjust providers
//user_pref("network.trr.resolvers", '[{ "name": "Cloudflare", "url": "https://mozilla.cloudflare-dns.com/dns-query" },{ "name": "SecureDNS", "url": "https://doh.securedns.eu/dns-query" },{ "name": "AppliedPrivacy", "url": "https://doh.appliedprivacy.net/query" },{ "name": "Digitale Gesellschaft (CH)", "url": "https://dns.digitale-gesellschaft.ch/dns-query" }, { "name": "Quad9", "url": "https://dns.quad9.net/dns-query" }]');
// PREF: EDNS Client Subnet (ECS)
// [WARNING] In some circumstances, enabling ECS may result
// in suboptimal routing between CDN origins and end users [2].
// [NOTE] You will also need to enable this with your
// DoH provider most likely.
// [1] https://en.wikipedia.org/wiki/EDNS_Client_Subnet
// [2] https://www.quad9.net/support/faq/#edns
// [3] https://datatracker.ietf.org/doc/html/rfc7871
//user_pref("network.trr.disable-ECS", true); // DEFAULT
// PREF: DNS Rebind Protection
// false=do not allow RFC 1918 private addresses in TRR responses (default)
// true=allow RFC 1918 private addresses in TRR responses
// [1] https://docs.controld.com/docs/dns-rebind-option
//user_pref("network.trr.allow-rfc1918", false); // DEFAULT
// PREF: assorted options
//user_pref("network.trr.confirmationNS", "skip"); // skip undesired DOH test connection
//user_pref("network.trr.skip-AAAA-when-not-supported", true); // [DEFAULT] If Firefox detects that your system does not have IPv6 connectivity, it will not request IPv6 addresses from the DoH server
//user_pref("network.trr.clear-cache-on-pref-change", true); // [DEFAULT] DNS+TRR cache will be cleared when a relevant TRR pref changes
//user_pref("network.trr.wait-for-portal", false); // [DEFAULT] set this to true to tell Firefox to wait for the captive portal detection before TRR is used
// PREF: DOH exlcusions
//user_pref("network.trr.excluded-domains", ""); // DEFAULT; comma-separated list of domain names to be resolved using the native resolver instead of TRR. This pref can be used to make /etc/hosts works with DNS over HTTPS in Firefox.
//user_pref("network.trr.builtin-excluded-domains", "localhost,local"); // DEFAULT; comma-separated list of domain names to be resolved using the native resolver instead of TRR
// PREF: Oblivious HTTP (OHTTP) (DoOH)
// [Oct 2023] Cloudflare are the only ones running an OHTTP server and resolver,
// but there needs to be a relay, and it's not the cheapest thing to run.
// [1] https://blog.cloudflare.com/stronger-than-a-promise-proving-oblivious-http-privacy-properties/
// [2] https://www.ietf.org/archive/id/draft-thomson-http-oblivious-01.html
// [3] https://old.reddit.com/r/dnscrypt/comments/11ukt43/what_is_dns_over_oblivious_http_targetrelay/ji1nl0m/?context=3
//user_pref("network.trr.mode", 2);
//user_pref("network.trr.ohttp.config_uri", "https://dooh.cloudflare-dns.com/.well-known/doohconfig");
//user_pref("network.trr.ohttp.uri", "https://dooh.cloudflare-dns.com/dns-query");
//user_pref("network.trr.ohttp.relay_uri", ""); // custom
//user_pref("network.trr.use_ohttp", true);
// PREF: Encrypted Client Hello (ECH) [FF118]
// [NOTE] HTTP is already isolated with network partitioning.
// [TEST] https://www.cloudflare.com/ssl/encrypted-sni
// [1] https://support.mozilla.org/en-US/kb/understand-encrypted-client-hello
// [2] https://blog.mozilla.org/en/products/firefox/encrypted-hello/
// [3] https://support.mozilla.org/en-US/kb/faq-encrypted-client-hello#w_can-i-use-ech-alongside-other-security-tools-like-vpnsre
// [4] https://wiki.mozilla.org/Security/Encrypted_Client_Hello#Preferences
//user_pref("network.dns.echconfig.enabled", true); // use ECH for TLS Connections
//user_pref("network.dns.http3_echconfig.enabled", true); // use ECH for QUIC connections
//user_pref("network.dns.echconfig.fallback_to_origin_when_all_failed", false); // fallback to non-ECH without an authenticated downgrade signal
/******************************************************************************
* SECTION: PROXY / SOCKS / IPv6 *
******************************************************************************/
// PREF: disable IPv6
// If you are not masking your IP, then this won't make much difference.
// And some VPNs now cover IPv6.
// [TEST] https://ipleak.org/
// [1] https://www.internetsociety.org/tag/ipv6-security/ (Myths 2,4,5,6)
//user_pref("network.dns.disableIPv6", true);
// PREF: 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
// [SETTING] Settings>Network Settings>Proxy DNS when using SOCKS v5
//user_pref("network.proxy.socks_remote_dns", true);
// PREF: 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]
// PREF: disable GIO as a potential proxy bypass vector
// Gvfs/GIO has a set of supported protocols like obex, network,
// archive, computer, dav, cdda, gphoto2, trash, etc.
// From FF87-117, by default only sftp was accepted.
// [1] https://bugzilla.mozilla.org/1433507
// [2] https://en.wikipedia.org/wiki/GVfs
// [3] https://en.wikipedia.org/wiki/GIO_(software)
//user_pref("network.gio.supported-protocols", ""); // [HIDDEN PREF] [DEFAULT FF118+]
// PREF: disable check for proxies
//user_pref("network.notify.checkForProxies", false);
/******************************************************************************
* SECTION: PASSWORDS *
******************************************************************************/
// PREF: disable password manager
// [NOTE] This does not clear any passwords already saved.
// [SETTING] Privacy & Security>Logins and Passwords>Ask to save logins and passwords for websites
//user_pref("signon.rememberSignons", false);
//user_pref("signon.rememberSignons.visibilityToggle", true); // DEFAULT
//user_pref("signon.schemeUpgrades", true); // DEFAULT
//user_pref("signon.showAutoCompleteFooter", true); // DEFAULT
//user_pref("signon.autologin.proxy", false); // DEFAULT
// PREF: disable auto-filling username & password form fields
// Can leak in cross-site forms and be spoofed.
// [NOTE] Username and password is still available when you enter the field.
// [SETTING] Privacy & Security>Logins and Passwords>Autofill logins and passwords
//user_pref("signon.autofillForms", false);
//user_pref("signon.autofillForms.autocompleteOff", true); // DEFAULT
// PREF: disable formless login capture for Password Manager [FF51+]
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1166947
user_pref("signon.formlessCapture.enabled", false);
// PREF: disable capturing credentials in private browsing
user_pref("signon.privateBrowsingCapture.enabled", false);
// PREF: disable autofilling saved passwords on HTTP pages
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1217152,1319119
//user_pref("signon.autofillForms.http", false); // DEFAULT
// PREF: disable Firefox built-in password generator
// Create passwords with random characters and numbers.
// [NOTE] Doesn't work with Lockwise disabled!
// [1] https://wiki.mozilla.org/Toolkit:Password_Manager/Password_Generation
//user_pref("signon.generation.enabled", false);
// PREF: disable Firefox Lockwise (about:logins)
// [NOTE] No usernames or passwords are sent to third-party sites.
// [1] https://lockwise.firefox.com/
// [2] https://support.mozilla.org/en-US/kb/firefox-lockwise-managing-account-data
// user_pref("signon.management.page.breach-alerts.enabled", false);
//user_pref("signon.management.page.breachAlertUrl", "");
//user_pref("browser.contentblocking.report.lockwise.enabled", false);
//user_pref("browser.contentblocking.report.lockwise.how_it_works.url", "");
// PREF: disable Firefox Relay
// Privacy & Security > Passwords > Suggest Firefox Relay email masks to protect your email address
//user_pref("signon.firefoxRelay.feature", "");
// PREF: disable websites autocomplete
// Don't let sites dictate use of saved logins and passwords.
//user_pref("signon.storeWhenAutocompleteOff", false);
// PREF: 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)
// [1] https://www.fxsitecompat.com/en-CA/docs/2015/http-auth-dialog-can-no-longer-be-triggered-by-cross-origin-resources/
user_pref("network.auth.subresource-http-auth-allow", 1);
// PREF: prevent password truncation when submitting form data
// [1] https://www.ghacks.net/2020/05/18/firefox-77-wont-truncate-text-exceeding-max-length-to-address-password-pasting-issues/
user_pref("editor.truncate_user_pastes", false);
// PREF: reveal password icon
//user_pref("layout.forms.reveal-password-context-menu.enabled", true); // right-click menu option; DEFAULT [FF112]
// [DO NOT TOUCH] Icons will double-up if the website implements it natively.
//user_pref("layout.forms.reveal-password-button.enabled", true); // always show icon in password fields
/****************************************************************************
* SECTION: ADDRESS + CREDIT CARD MANAGER *
****************************************************************************/
// PREF: disable form autofill
// [NOTE] stored data is not secure (uses a JSON file)
// [1] https://wiki.mozilla.org/Firefox/Features/Form_Autofill
// [2] https://www.ghacks.net/2017/05/24/firefoxs-new-form-autofill-is-awesome
//user_pref("extensions.formautofill.addresses.enabled", false);
//user_pref("extensions.formautofill.creditCards.enabled", false);
/******************************************************************************
* SECTION: MIXED CONTENT + CROSS-SITE *
******************************************************************************/
// PREF: block insecure active content (scripts) on HTTPS pages
// [TEST] https://mixed-script.badssl.com/
// [1] https://trac.torproject.org/projects/tor/ticket/21323
//user_pref("security.mixed_content.block_active_content", true); // DEFAULT
// PREF: upgrade passive content to use HTTPS on secure pages
// Firefox will now automatically try to upgrade <img>, <audio>, and <video> elements
// from HTTP to HTTPS if they are embedded within an HTTPS page. If these
// mixed content elements do not support HTTPS, they will no longer load.
// [NOTE] Enterprise users may need to disable this setting [1].
// [1] https://blog.mozilla.org/security/2024/06/05/firefox-will-upgrade-more-mixed-content-in-version-127/
//user_pref("security.mixed_content.upgrade_display_content", true); // [DEFAULT FF127+]
//user_pref("security.mixed_content.upgrade_display_content.audio", true); // [DEFAULT FF119+]
//user_pref("security.mixed_content.upgrade_display_content.image", true); // [DEFAULT FF127+]
//user_pref("security.mixed_content.upgrade_display_content.video", true); // [DEFAULT FF119+]
// PREF: block insecure passive content (images) on HTTPS pages
// [WARNING] This preference blocks all mixed content, including upgradable.
// Firefox still attempts an HTTP connection if it can't find a secure one,
// even with HTTPS First Policy. Although rare, this leaves a small risk of
// a malicious image being served through a MITM attack.
// Disable this pref if using HTTPS-Only Mode.
// [NOTE] Enterprise users may need to enable this setting [1].
// [1] https://blog.mozilla.org/security/2024/06/05/firefox-will-upgrade-more-mixed-content-in-version-127/
user_pref("security.mixed_content.block_display_content", true);
// PREF: block insecure downloads from secure sites
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1660952
//user_pref("dom.block_download_insecure", true); // DEFAULT
// PREF: allow PDFs to load javascript
// https://www.reddit.com/r/uBlockOrigin/comments/mulc86/firefox_88_now_supports_javascript_in_pdf_files/
user_pref("pdfjs.enableScripting", false);
// PREF: limit allowed extension directories
// The pref value represents the sum: e.g. 5 would be profile and application directories.
// [WARNING] Breaks usage of files which are installed outside allowed directories.
// [1] https://archive.is/DYjAM
// 1=profile, 2=user, 4=application, 8=system, 16=temporary, 31=all
//user_pref("extensions.enabledScopes", 5); // [HIDDEN PREF] DEFAULT
// user_pref("extensions.autoDisableScopes", 15); // [DEFAULT: 15]
// PREF: disable bypassing 3rd party extension install prompts
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1659530,1681331
user_pref("extensions.postDownloadThirdPartyPrompt", false);
// PREF: disable middle click on new tab button opening URLs or searches using clipboard [FF115+]
// Enable if you're using LINUX.
//user_pref("browser.tabs.searchclipboardfor.middleclick", false); // DEFAULT WINDOWS macOS
// PREF: disable content analysis by Data Loss Prevention (DLP) agents
// DLP agents are background processes on managed computers that
// allow enterprises to monitor locally running applications for
// data exfiltration events, which they can allow/block based on
// customer-defined DLP policies.
// [1] https://github.com/chromium/content_analysis_sdk
//user_pref("browser.contentanalysis.default_allow", false); // [FF124+] [DEFAULT: false]
// PREF: enforce TLS 1.0 and 1.1 downgrades as session only
//user_pref("security.tls.version.enable-deprecated", false); // DEFAULT
// PREF: enable (limited but sufficient) window.opener protection
// Makes rel=noopener implicit for target=_blank in anchor and area elements when no rel attribute is set.
// [1] https://jakearchibald.com/2016/performance-benefits-of-rel-noopener/
//user_pref("dom.targetBlankNoOpener.enabled", true); // DEFAULT
// PREF: enable "window.name" protection
// If a new page from another domain is loaded into a tab, then window.name is set to an empty string. The original
// string is restored if the tab reverts back to the original page. This change prevents some cross-site attacks.
//user_pref("privacy.window.name.update.enabled", true); // DEFAULT
// PREF: disable automatic authentication on Microsoft sites [WINDOWS]
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=1695693,1719301
//user_pref("network.http.windows-sso.enabled", false);
/******************************************************************************
* SECTION: HEADERS / REFERERS *
******************************************************************************/
// PREF: default referrer policy (used unless overriden by the site)
// 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin (default),
// 3=no-referrer-when-downgrade
// [1] https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy#examples
// [2] https://plausible.io/blog/referrer-policy
//user_pref("network.http.referer.defaultPolicy", 2); // DEFAULT
//user_pref("network.http.referer.defaultPolicy.pbmode", 2); // DEFAULT
// PREF: default Referrer Policy for trackers (used unless overriden by the site)
// Applied to third-party trackers when the default
// cookie policy is set to reject third-party trackers.
// 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin (default),
// 3=no-referrer-when-downgrade
// [1] https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy#examples
//user_pref("network.http.referer.defaultPolicy.trackers", 1);
//user_pref("network.http.referer.defaultPolicy.trackers.pbmode", 1);