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Firefox Developer 86.0b5 playing videos in 1080p on fulscreen drains CPU

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After last big update of Firefox Developer Edition I am having really huge video playback bugs. I've tested it on various video streaming services. When video is in 1080p and launched in fulscreen mode there are three issues. 1. Picture is freezing but audio is istill playing then frame jump to right moment and everything is ok 2. Video with sound is lagging. There is a sound like you processor is running over 100% and it is still not enough 3. Video and sound is stopping. Everything is happening in random moments for few seconds.

On Opera I don't have any problem. My processor is AMD Ryzen 5 5600X (without any OC)

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