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Whenever I press SHIFT+(any key), BACKSPACE or some other keys, I get a "Press ESC to leave full-screen mode" message.

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http://i.imgur.com/rFsDC.jpg

Screenshot above.

Whenever I press SHIFT+(any key), BACKSPACE, or some other keys, I get a "Press ESC to leave full-screen mode" message.

http://i.imgur.com/rFsDC.jpg Screenshot above. Whenever I press SHIFT+(any key), BACKSPACE, or some other keys, I get a "Press ESC to leave full-screen mode" message.

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I started in safe mode, and the problem was gone, so I disabled all my extensions, enabled them one after another (I have 13 of them) restarted Firefox after every extension enabled, problem gone !??? So I still don't know which extension was causing the problem, but at least now I don't have it anymore ... My firefox must be haunted :-)

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