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2421: Ion/JIT trusted principals, closes #914

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Thorin-Oakenpants 2020-04-09 06:07:13 +00:00 committed by GitHub
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user.js
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@ -1054,11 +1054,14 @@ user_pref("dom.vibrator.enabled", false);
* [5] https://www.mozilla.org/security/advisories/mfsa2017-05/#CVE-2017-5400
* [6] https://rh0dev.github.io/blog/2017/the-return-of-the-jit/ ***/
user_pref("javascript.options.asmjs", false);
/* 2421: disable Ion and baseline JIT to help harden JS against exploits
/* 2421: disable Ion and baseline JIT to harden against JS exploits [SETUP-HARDEN]
* [NOTE] In FF75+, when **both** Ion and JIT are disabled, **and** the new pref
* hidden pref is enabled, then Ion can still be used by extensions (1599226)
* [WARNING] Disabling Ion/JIT can cause some site issues and performance loss
* [1] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-0817 ***/
// user_pref("javascript.options.ion", false);
// user_pref("javascript.options.baselinejit", false);
// user_pref("javascript.options.jit_trustedprincipals", true); // [FF75+] [HIDDEN PREF]
/* 2422: disable WebAssembly [FF52+] [SETUP-PERF]
* [NOTE] In FF71+ this no longer affects extensions (1576254)
* [1] https://developer.mozilla.org/docs/WebAssembly ***/