I recently purchased a new PC and use FEBE to make backups of my old Firefox settings. Everything transferred to the new PC except my passwords. When I tried it, it looked like they were there in the raw files, but Firefox wouldn't recognize them. In fact, after restoring them, Firefox would no longer save any new passwords. I've got it all sorted out now, but if you use FEBE, be forewarned.
Regards,
Dan