
Does customize 'Firefox Using AutoConfig' work on the official Mozilla Firefox release?
I'm trying to configure Firefox using AutoConfig as described in this support article, Customize Firefox using AutoConfig.
However, I can't get Firefox to read the firefox.cfg file.
Details:
- Firefox version: 139.0.1 (64-bit)
- Build ID: 20250529122813
- Source: Built from https://hg.mozilla.org/releases/mozilla-release/rev/e7720952908c6d50d8747132d1bb3e6424f8d9a5
Here's what I've set up:
1. autoconfig.js is in "C:\Program Files\Mozilla Firefox\defaults\pref\" and contains (LF line endings):pref("general.config.filename", "firefox.cfg"); pref("general.config.obscure_value", 0);
2. firefox.cfg is in "C:\Program Files\Mozilla Firefox\" and begins with "//".
Questions:
- Does AutoConfig still work in the official Mozilla Firefox release (not ESR)?
- Is there a launch option or environment variable required to enable it?
- Is there any way to troubleshoot if firefox.cfg is not being read?
Any help is appreciated, thanks!
I'm trying to configure Firefox using AutoConfig as described in this support article, [[Customize Firefox using AutoConfig]].
However, I can't get Firefox to read the '''''firefox.cfg''''' file.
Details:
* Firefox version: 139.0.1 (64-bit)
* Build ID: 20250529122813
* Source: Built from https://hg.mozilla.org/releases/mozilla-release/rev/e7720952908c6d50d8747132d1bb3e6424f8d9a5
Here's what I've set up:
1. '''autoconfig.js''' is in "''C:\Program Files\Mozilla Firefox\defaults\pref\''" and contains (LF line endings):<pre>
pref("general.config.filename", "firefox.cfg");
pref("general.config.obscure_value", 0);
</pre>
2. '''firefox.cfg''' is in "''C:\Program Files\Mozilla Firefox\''" and begins with "''//''".
Questions:
* Does '''AutoConfig''' still work in the official Mozilla Firefox release (not ESR)?
* Is there a launch option or environment variable required to enable it?
* Is there any way to troubleshoot if firefox.cfg is not being read?
Any help is appreciated, thanks!
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