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Where are the about:config settings for a profile stored?

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New Contributor

Where are the about:config settings for a profile stored?

I am setting up a custom firefox profile and would like to tweak some of the options that are accessed via about:config.

I would like to know where this information is stored and whether I am able to modify these options outside of the browser.

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Shooting Star Contributor

Re: Where are the about:config settings for a profile stored?

They're stored in the prefs.js file, which is a plain text file.

Preferences can also be set at startup using the user.js file. This file doesn't exist by default.

Preferences can also be locked with the mozilla.cfg file in the installation folder. This file doesn't exist by default.

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Shooting Star Contributor

Re: Where are the about:config settings for a profile stored?

They're stored in the prefs.js file, which is a plain text file.

Preferences can also be set at startup using the user.js file. This file doesn't exist by default.

Preferences can also be locked with the mozilla.cfg file in the installation folder. This file doesn't exist by default.

New Contributor

Re: Where are the about:config settings for a profile stored?

Thanks, I was modifying the prefs.js file the whole time but didn't realize these were the same settings from about:config. The user.js file is also useful to know.