This is a Ubuntu (Intrepid specific?) issue it seems, and may be linked to Compiz.
Regardless, I found this to be a fix for the problem:
Press F11 twice to make the window normal size
Un-maximize the window and then close it. The window may go outside of your Toolbar/Panel borders, therefore the Close button will be hidden, so you may have to Right-Click on it where it appears in the toolbar and close it that way, or Right-Click and select Move to bring the Close button out from under the panel.
Restart FF , Maximize it and the problem should be solved.
This worked for me. It isn’t a fix , but should remove the problem.
I haven’t restarted my PC since, but have restarted FF a few times and it seems persistent.
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