I recently put firefox (17.0.5) in full screen for a while on my Linux Laptop running CentOS6 (up to date on 3/5/2013) I never managed to exit this full screen mode, neither with the contextual menu in the tab bar (appeared when I went to the top of the screen), nor with F11. Even when I close and restart Firefox, or when I shut off and restart the laptop, I get back to this fullscreen mode each time I open firefox. Only the failsafe mode (run with the command firefox -safe-mode) is not in full screen, and that was for me the only way to disable all my addons (as recommanded by some similar threads on the support forum). I have no access to any menu, but thanks to the about:plugins special address, I could control that my plugins are off, and e for with about:support I got an overview of my installation, that seem OK. There is also about:config to edit my preferences, but I don't find the one which could be responsible for this behavior. Any ideas?
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You can check for problems caused by a corrupted localstore.rdf file.
Thank you Cor-el for the trick. It solved the problem.
In fact, rather than deleting localstore.rdf as recommended by your link, I edited it with a text editor, and just deleted the directive :
that appeared once in that file. Of course, you should pay attention to the (XML?) structure of the file, in mine I had a block closure ( /> ) after that directive on the same line, to be kept !
Rather than removing the text, you can just replace "fullscreen" with "normal". That's a little safer.