Firefox stores all your user data, cookies, site preferences, custom settings, bookmarks, history, and extensions in a profile folder, which makes it easy to backup and restore your settings. You can, for example, create a copy of profile folder on a USB key and then use it to import your browser settings to another device. Here are the instructions on how to locate the profile folder for the different versions of Firefox.
Where Does Firefox Stores Your Personal Data and Settings?
The Quick Method
Open Firefox, click on the Menu key > Help menu (?) > Troubleshooting information:
Go to Application Basics > Profile Folder and then click on Show Folder:
The Manual Method
The first step is to enable the display of hidden files on your system. Go to Folder Options > View and tick the Show hidden files, folders, and drives checkbox.
Locate and backup the following folders:
- Windows XP: C:\Documents and Settings\Username\Application Data\Mozilla\Profiles - Windows Vista: C:\users\Username\AppData\Roaming\Mozilla\Profiles.
- Windows 8, 8.1, and 10: C:\Users\Username\AppData\Roaming\Mozilla\Firefox\Profiles.
N.B. In Vista, you’ll need to take ownership of the profile folder in order to view its content. Right-click on the Profile folder > Properties > Security tab and click on the Advanced button. Click on the Change button displayed next to Owner, enter your username in the Enter the object name to select field and click on Check names.
The profile folder is located in /home/Username/.mozilla/firefox/.
In Mac OS X
The profile folder is located in one of these locations: