If there’s a power outage, or for some other reason your Mozilla Firefox bookmarks disappear, this article might help you restore them.
Suggestion 1: Assure Firefox is closed. Rename bookmarks.bak in your profile folder details (C:\Documents and Settings\Joe\Application Data\Mozilla\Firefox\Profiles\68y597g2.default, obviously changing the italic details, if you need help read this) to bookmarks.html, deleting that first.
Suggestion 2: Assure Firefox is closed. Go to C:\Documents and Settings\Joe\Application Data\Mozilla\Firefox\Profiles\68y597g2.default\bookmarkbackups and replace bookmarks.html in your profile folder with the the latest working backup.
Suggestion 3: In the future, use software like MozBackup!
It might be helpful to show where the profiles are located for those of us who don’t use windows…