History of Profiles - Where Firefox stores your bookmarks, passwords and other user data
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Hi farid, Firefox does not keep a backup of the full profile folder.
Firefox does make bookmark backups when you add/delete bookmarks, but only for a couple of weeks. You can see the available backups using the steps in this article: Restore bookmarks from backup or move them to another computer.
By the way, if your entire Firefox setup changed all at once, it's possible that you are using a new profile and can still switch to the old one. Please see this article: Profile Manager - Create, remove or switch Firefox profiles (please do not use "Remove").