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
|
/* override recipe: enable session restore ***/
user_pref("browser.startup.page", 3); // 0102
user_pref("browser.sessionstore.privacy_level", 0); // 1003 optional to restore cookies/formdata
user_pref("privacy.clearOnShutdown.history", false); // 2811
user_pref("privacy.cpd.history", false); // 2820 optional to match when you use Ctrl-Shift-Del
/* 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] Breakage: older modems/routers and some sites e.g banks, vimeo, icloud, instagram
* If "2" is too strict, then override to "0" and use Smart Referer extension (Strict mode + add exceptions) ***/
user_pref("network.http.referer.XOriginPolicy", 0);
/** SANITIZE ON SHUTDOWN: IGNORES "ALLOW" SITE EXCEPTIONS ***/
/* 2811: set/enforce what items to clear on shutdown (if 2810 is true) [SETUP-CHROME]
* [NOTE] If "history" is true, downloads will also be cleared
* [NOTE] "sessions": Active Logins: refers to HTTP Basic Authentication [1], not logins via cookies
* [1] https://en.wikipedia.org/wiki/Basic_access_authentication ***/
user_pref("privacy.clearOnShutdown.downloads", false); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown.history", false); // [DEFAULT: true]
user_pref("privacy.clearOnShutdown.sessions", false); // [DEFAULT: true]
/* 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] Override this if you trust and use a privacy respecting search engine ***/
user_pref("keyword.enabled", true);
/* 2620: enforce PDFJS, disable PDFJS scripting
* 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")
* [WHY] pdfjs is lightweight, open source, and secure: the last exploit was June 2015 [1]
* 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.
* [NOTE] JS can still force a pdf to open in-browser by bundling its own code
* [SETUP-CHROME] You may prefer a different pdf reader for security/workflow reasons
* [SETTING] General>Applications>Portable Document Format (PDF)
* [1] https://cve.mitre.org/cgi-bin/cvekey.cgi?keyword=pdf.js+firefox ***/
user_pref("pdfjs.disabled", true); // [DEFAULT: false]
/* 5003: disable saving passwords
* [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);
/* 5017: disable Form Autofill
* If .supportedCountries includes your region (browser.search.region) and .supported
* is "detect" (default), then the UI will show. Stored data is not secure, uses JSON
* [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.creditCards.enabled", false); // [FF56+]
user_pref("extensions.formautofill.heuristics.enabled", false); // [FF55+]
/* 2022: disable all DRM content (EME: Encryption Media Extension)
* Optionally hide the setting which also disables the DRM prompt
* [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); // already disabled
user_pref("browser.eme.ui.enabled", false);
/* 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
* [SETUP-WEB] PR_CONNECT_RESET_ERROR: this pref *might* be the cause
* [STATS] Firefox telemetry (Sept 2022) shows ~8% of successful 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);
user_pref("network.dns.disableIPv6", false);
|
