Disable JavaScript JIT

Fixes #373
pyllyukko · Feb 12, 2018 · 8f4199c · 8f4199c
1 parent 944293a
commit 8f4199c
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diff --git a/README.md b/README.md
@@ -205,6 +205,7 @@ Settings that do not belong to other sections or are user specific preferences.
 * Disable video stats to reduce fingerprinting threat [ [1](https://bugzilla.mozilla.org/show_bug.cgi?id=654550) [2](https://github.com/pyllyukko/user.js/issues/9#issuecomment-100468785) [3](https://github.com/pyllyukko/user.js/issues/9#issuecomment-148922065) ]
 * Don't reveal build ID
 * Prevent font fingerprinting [ [1](https://browserleaks.com/fonts) [2](https://github.com/pyllyukko/user.js/issues/120) ]
+* Disable JavaScript JIT [ [1](https://trac.torproject.org/projects/tor/ticket/21011) ]
 * Enable only whitelisted URL protocol handlers [ [1](http://kb.mozillazine.org/Network.protocol-handler.external-default) [2](http://kb.mozillazine.org/Network.protocol-handler.warn-external-default) [3](http://kb.mozillazine.org/Network.protocol-handler.expose.%28protocol%29) [4](https://news.ycombinator.com/item?id=13047883) [5](https://bugzilla.mozilla.org/show_bug.cgi?id=167475) [6](https://github.com/pyllyukko/user.js/pull/285#issuecomment-298124005) ]
 
 ### Extensions / plugins

diff --git a/user.js b/user.js
@@ -325,6 +325,11 @@ user_pref("browser.startup.homepage_override.buildID",		"20100101");
 // https://github.com/pyllyukko/user.js/issues/120
 user_pref("browser.display.use_document_fonts",			0);
 
+// PREF: Disable JavaScript JIT
+// https://trac.torproject.org/projects/tor/ticket/21011
+user_pref("javascript.options.baselinejit.content",		false);
+user_pref("javascript.options.ion.content",			false);
+
 // PREF: Enable only whitelisted URL protocol handlers
 // http://kb.mozillazine.org/Network.protocol-handler.external-default
 // http://kb.mozillazine.org/Network.protocol-handler.warn-external-default