My Firefox 3 bookmarks toolbar disappeared suddenly. It vanished from my browser window, and when I tried to bring in back by right-clicking on the toolbars' area and re-checking the "bookmark toolbar ...
Right click the file toolbar and choose customize. Click on new toolbar and name it and then drag the bookmarks icon onto it. All my toolbar bookmarks showed up then. Hope that helps.
Thank You So Much - your method worked like a charm!