It's actually quite simple to restore your lost information. Hover your Firefox Menu Tab and click the Bookmarks Menu. The little box will pop up. Click on Import and Backup ... the second option down is "restore" . Hit that and it should give you a list of dates that Firefox auto-saves your bookmarks. Just pick a date and apply. If this doesn't help. You may have to revert to an earlier version or check your addons.

Thank you for the information, but I attempted to restore with all the backup dates listed and none work. I keep getting the message "Unable to process the backup file." I also have issues with the tool bar at the top regularly going gray and not being able to access anything from the list. Tools, Edit, View, History, Bookmarks Tools Help nothing works