Still no update on super-high CPU usage of Twitch on Firefox, an issue that has been open for at least 4 years [1][2]. I really want to like Firefox and I want there to be viable alternatives to Chrome but when playing video back at 360p (not joking) grinds my 1.5 year old Macbook Pro to a halt on a popular website... I just can't use it. I don't know if this is a video codec issue, a CSS/JS issue that Twitch manages…
Is it multi-user video chat? Firefox can't do this efficiently and it's also a problem with other tools like Jitsi.
1. Why don't users have to do that with Chrome?
2. While it does help, the video-without-chat CPU+GPU usage is still higher than Chrome's CPU+GPU usage for video-with-chat.
If that also applies to Youtube or other services and has been open for 4+ years then... yeah, big problem.