A few minutes into the video, you can see that Firefox CPU usage has dropped to ~3%.
https://media.hachyderm.io/media_attachments/files/109/965/285/896/656/140/original/7c070b03c8fc7cbc.png
FiREFoX UsES AlL ThE CpU WhEN YoU STReaM VidEOS
You use Chrome because you don't care about OSS. Get off your "chromium is better" horse.
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