Rated 2 out of 5 stars
If you use QuickToolbars to hide all toolbars (including the menu bar) there doesn't seem to be any way to get them back again except by restarting Firefox. I'm using Firefox 3.6.This review is for a previous version of the add-on (184.108.40.206).
If you hide all toolbars you must use shortcuts to get them back. The default shortcuts are Alt + 1 => Alt + 6. You can change them in the option window.