Did your browser crash?
If so, that can wipe out the upload of bookmarks that most browsers perform upon start up.
Determine where your browser stores your bookmarks file. Most likely, it maintains a back up of the file. Determine which is the most recently saved back up.
Then open your browser, go through the toolbar to upload bookmarks, and then upload the backup file. It
Oh. Well, if my browser is at fault, is there a way to search archives if I still have titles?