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Firefox will not correctly fullscreen videos first try.

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every time I first try and full screen a video it will not correctly fill the screen. if i go back to windowed and full screen again it will be fixed, and will remain fixed for as long as firefox is still open. if I close firefox and open again it does the same thing. See screenshot for problem.

every time I first try and full screen a video it will not correctly fill the screen. if i go back to windowed and full screen again it will be fixed, and will remain fixed for as long as firefox is still open. if I close firefox and open again it does the same thing. See screenshot for problem.
Iqhotyoshelwe imifanekiso ekwisikrini

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What site is this? Are you sure your have the correct video driver for the setup. That sounds more like GPU driver issue then a Browser as the browser uses what's giving to it.