Nevermind. Found the answer. Firefox does automatic bookmark backups.
"Bob Travis" <[hidden email]> wrote in message
>I was keeping a record of websites I visited last week and I didn't want to
>lose them but inadvertently I did. By the time I realized they were gone it
>was too late for any "undo" because I had rebooted the machine -- dumbly
>thinking that a system restore which had been made automatically for me
>about five hours earlier would have restored the bookmarks. It didn't.
> What I'd like to know is whether those bookmarks may be in a hidden file
> somewhere, either in my Mozilla directory or in XP's "system restore"
> Thanks for a clue.