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Go back to the regular full screen instead of firefox's fullscreen mode?

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Just today I found that when I click on youtube videos to make them fullscreen, it goes into a fullscreen mode with the both to deny or allow firefox to be in fullscreen. Can I go back to the old and much better and faster full screen that I had yesterday? It took just a millisecond to go to full screen and back again with the old way but the new one it lags for a second to look sleek or something.

Thanks

Just today I found that when I click on youtube videos to make them fullscreen, it goes into a fullscreen mode with the both to deny or allow firefox to be in fullscreen. Can I go back to the old and much better and faster full screen that I had yesterday? It took just a millisecond to go to full screen and back again with the old way but the new one it lags for a second to look sleek or something. Thanks

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It is possible that you have changed from a Flash based player to the HTML5 media player.

This extension allows to switch between the Flash player and the HTML5 media player on the YouTube website. YouTube Flash Video Player: