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Does customize 'Firefox Using AutoConfig' work on the official Mozilla Firefox release?

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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:

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!

Ti ṣàtúnṣe nípa Jon

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