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Full Screen on seondary monitor

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When I drag over a youtube or other video tab to my secondary monitor and try to make that video full screen on my secondary monitor Firefox makes the video return to my main screen as a full screen and the secondary screen go grey. How do I make firefox allow a full screen video to play on my secondary monitor while I can work on my main monitor?

When I drag over a youtube or other video tab to my secondary monitor and try to make that video full screen on my secondary monitor Firefox makes the video return to my main screen as a full screen and the secondary screen go grey. How do I make firefox allow a full screen video to play on my secondary monitor while I can work on my main monitor?