Backup Mozilla Firefox preferences

This page was last updated on August 10, 2010

In many of tips discussed on TrishTech.com, you have to manually configure settings in Mozilla Firefox by typing about:config in the Firefox location bar and fiddling with the settings. In one of these kind of adventures you may mess your Firefox settings, so it is a better idea to backup your Firefox preferences. Here is how :

Press the key combination Windows logo key + R to open the Run dialog.
In the Run dialog, type %appdata%\mozilla\firefox\profiles and press Enter.
You will find a folder with its name ending in .default, for example plydapyi.default. Open this folder.
You will find a file prefs.js. Copy this file to a safe location. This file contains the Firefox preferences for your default profile.

If later at any time you mess up your Firefox preferences (settings you can change from about:config page), just copy this file prefs.js to the same folder.