Profile backup
From MozillaZine Knowledge Base
Find your profile folder. Copy the following files, if they exist, and place them in a safe location
* bookmarks.html * user.js * prefs.js * cookies.txt * cookperm.txt * signons.txt * key3.db
Find your profile folder. Copy the following files, if they exist, and place them in a safe location
* bookmarks.html * user.js * prefs.js * cookies.txt * cookperm.txt * signons.txt * key3.db