- First close down Firefox if it is running.
- Go to Start>Run and type %appdata%\mozilla\firefox\profiles and hit <Enter>.
- The resulting explorer window that opens will contain a folder with a peculiar name like ud732v0a.default. The actual folder name that you see will most probably be different, but the name will resemble something like this.

- Open the above folder and among other files you will find a file called prefs.js. This is the file we are looking for. Just copy it to a safe location. Should you mess up something in ‘about:config’, simply close Firefox and copy the backup of prefs.js back to its original location.
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{ 3 comments… read them below or add one }
hey do you know how to restore the settings in about:config cause i messed up pls email me the answer
@Cris: I have written a post on how to restore about:config default settings. Let me know if it helps you.
http://www.dq.winsila.com/internet/how-to-restore-firefox-aboutconfig-default-settings.html
Oke this is a real good tip, use it before updating firefox.
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