best firefox plugin ever – install it now, seriously

I’ve been using this plugin for a couple years now and it’s saved my arse at least half a dozen times when Firefox corrupts one user file or another for some reason:

http://www.pikey.me.uk/mozilla/?addon=bb

It’s called “Bookmark Backup” but it does SO much more.
If you open the options you can tell it to also save your history and more importantly your password files among many other files.