The problem often happened with Youtube fullscreen video plaback. https://www.youtube.com/watch?v=LXb3EKWsInQ For local video's fullscreen playback, the problem existed in Bug 1970043.
Bug 1970045 Comment 3 Edit History
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The problem often happened with Youtube fullscreen video plaback. https://www.youtube.com/watch?v=LXb3EKWsInQ For local video's fullscreen playback, the problem existed as Bug 1970043.
The problem often happened with Youtube fullscreen video plaback. https://www.youtube.com/watch?v=LXb3EKWsInQ For local video's fullscreen playback with layer compositor, the problem existed as Bug 1970043.