I am not aware of any Firefox method for doing that. However the Windows OS is often capable of rolling back files to previous versions. Take care always to back up the original first, because it will be overwritten. * http://windows.microsoft.com/en-us/windows/previous-versions-files-faq#1TC=windows-7 The bookmarks and History are actually in the database places.sqlite and as you are apparently aware Firefox also creates a series of snapshot backups of bookmarks that will restore into places.sqlite * [[Restore bookmarks from backup or move them to another computer]] I have not used Greasemonkey for a long while I guess it stores its scripts within some file in the Firefox profile * [[Profiles - Where Firefox stores your bookmarks, passwords and other user data]] **[[Recovering important data from an old profile]] Incidentally if you ever deliberately use Firefox Sync to Sync bookmarks you must also routinely backup the bookmarks manually. Sync will occasionally corrupt or duplicate your bookmarks and that will be almost impossible to sort out without suitable unaffected backups.