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When moving a tab to another Firefox window fullscreen no longer works

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I have two monitors and when I have Firefox open on both with a video playing on one screen, if I move the video tab to the other window of Firefox the full screen button no longer works. This happens with youtube, netflix, and vimeo.

I have two monitors and when I have Firefox open on both with a video playing on one screen, if I move the video tab to the other window of Firefox the full screen button no longer works. This happens with youtube, netflix, and vimeo.

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Does F11 work for entering Full Screen mode in that situation?

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F11 causes the browser to go fullscreen, but not the video