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Firefox Developer in fullscreen mode get back to normal window after watch fullscreen youtube video

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I'm using Firefox Developer Edition, using it in fullscreen mode in Mac OS X. Firefox get back to window mode after watching a youtube video in fullscreen and close video.

I'm using Firefox Developer Edition, using it in fullscreen mode in Mac OS X. Firefox get back to window mode after watching a youtube video in fullscreen and close video.

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The Esc key doesn't work to get out of the video fullscreen mode?

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Yes, It is working, but It is getting me out from fullscreen of firefox too.