Bookmarks, I hardly knew ye

I love Firefox and all, but it's got some glitches that kill me. I turned the computer on this morning, and no bookmarks. None. After some rooting around, I guess this has happened to a handful of people - the bookmarks just vanish. What I didn't know was that when you close Firefox, it backs up your bookmarks and overwrites previous backups. So when I closed it to do a system restore, *poof* there went my backed-up bookmarks.

So, if there any passing computer folks out there, am I right about what happened? And what should I do? I'm not going back to internet explorer, but Firefox's glitches annoy me to no end.