From the [[Refresh Firefox - reset add-ons and settings]] document: <blockquote>'''Note:''' Your old Firefox profile will be placed on your desktop in a folder named "Old Firefox Data". If the refresh didn't fix your problem you can restore some of the information not saved by [[Recovering important data from an old profile#w_copying-files-between-profile-folders|copying files to the new profile that was created]]. If you don't need this folder any longer, you should delete it as it contains sensitive information.</blockquote> Hope this helps.