Description of problem: Since upgrading to 3.0.2, Firefox starts up taking the full screen. The window bar isn't visible. It seems impossible to make it smaller, since: 1. trying to grab the resize section (bottom-right) and dragging doesn't work. 2. alt-space and then Resize doesn't work either. I tried logout/login but that didn't work either. Firefox starts up correctly in Safe Mode, but after restarting in normal mode, it's back to full screen.
I managed to resolve the problem by starting firefox into safe mode and selecting "Reset toolbar and controls". After this, firefox starts up correctly again.
It may be something broken in your profile... Thanks for the info, closing as cantfix.