Quote from cable:
Not to sound like a fanboy, but I've never had this happen on any of my systems or any of the many systems at work, on any platform. There must be a weird conflict or screwed up library somewhere on your system that I don't have (some of those extensions are buggier than three-month old roadkill). I've been using the original Mozilla Suite, then firefox or firebird or whatever it was originally called, since day one and haven't had this happen.
The bookmark file is just one file named bookmarks.html in your (from memory) windows > application support > firefox > blah blah blah> directory (I'm assuming you're running Windows). On my Linux system anyway, there's also a bookmarks.bak file, which I would guess is a backup. Hopefully your backup is from before your crash.
I have at times emailed my bookmarks file to my Yahoo email account so it's stored permanently on Yahoo's servers. When I was on Windows, I'd have to format pretty regularly, and having a backup offsite was handy to say the least.
It hasn't happened in quite a while ... just when I would unplug the PC before it had competely shut down ... something I shouldn't have been doing anyway... if there were a bak file I didn't know where it was.