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playing youtube videos very slow

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playing youtube videos 720p CPU goes up to 100˚C and 100% CPU on all cores it is since upgrade 88.0, before it was ok compared to chromium browser 720p ~ 20%

if I load 2-3 YT videos in tabs, the playback stops, changing tabs takes seconds, and also slows other applications down

playing youtube videos 720p CPU goes up to 100˚C and 100% CPU on all cores it is since upgrade 88.0, before it was ok compared to chromium browser 720p ~ 20% if I load 2-3 YT videos in tabs, the playback stops, changing tabs takes seconds, and also slows other applications down

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This also happened to me when I did the last two updates I dont know why but currently I cant watch YT very slow to load and run with freezing and all that you hate.

I use this addon

https://addons.mozilla.org/en-US/firefox/addon/fast-youtube-load/