I have written a very light extension for Firefox (successfully tested with 1.5.0.9 and 2.0) that enhances the Full Screen mode, removing the last visible toolbar and showing it again with the statusbar when the mouse pointer reaches the top edge of the screen. It's not ready yet, I want to do the same when it reaches the bottom edge, fix one mouse pointer bug, and make tabs go away in fuller screen mode. But it's already cool and very useful for slideshows. Tested on WinXP and Linux. Available here. /* enjoy */