This doesn't like a recent regression as I could also reproduce this on 80. And clicking on the video in fullscreen can not play or pause it, maybe something related to event dispatching? investigating...
Bug 1749721 Comment 2 Edit History
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This doesn't look like a recent regression as I could also reproduce this on 80. And clicking on the video in fullscreen can not play or pause it, maybe something related to event dispatching? investigating...