Oops. Firefox seems to have deleted my Bookmarks Toolbar folder but not my bookmarks. (See the exciting details here).
I suspect there’s no easy way to fix it, and I’m trying to avoid creating a new Firefox profile. Hopefully some developer will read my problem and come up with a brilliant solution.
While stumbling through things, I noticed this great list of problematic Firefox plugins. Also, I learned about the Firefox sidebar which is kind of cool. But the two things you need to know Ctl + Shift + S will cause the Bookmarks Sidebar to appear. Ctl +H causes the Firefox History to appear. Nice to know these things!
Update: I can’t explain why, but the problem fixed itself after the browser crashed. Arrgh!