So it looks Firefox 3.6.x has added another "Full Screen" shortcut.
Fullscreen (previously and still triggerable via the F11 key)can now be triggered by hitting Cmd+Shift+F. This steps on the often used Firefox Web Developer Toolbar's "Display Element Information" shortcut which is also Cmd+Shift+F.
I wonder if they added it becuase Google Chrome uses Cmd+Shift+F for fullscreen mode? Anyway. There's a workaround.
Firefox offers no native way to modify keyboard shortcuts but you can change them by
1) installing the "keyconfig" xpi.
2) restarting the browser
3) Go to "Tools | Keyconfig... (it's down near the bottom of the list.)
4) Change or delete the Full Screen = Cmd+Shift+F shortcut
