Must have for Ubuntu Linux! Rated 4 out of 5 stars
I desperately needed that for GNU/Linux... At last, my Ubuntu version Firefox 10 looks like the Windows version of Firefox 10 which has no title bar.
By the way, hiding the title bar does not work if "Hide Menubar" extension is installed. At least, the situation in Ubuntu 10.10 Maverick Meerkat with new wave theme is like that. Whatever, I sacrificed Hide Menubar then hide the menubar AND titlebar forever! :-)