[bufferoverflow]

Seriously, FF on Ubuntu causes 100% CPU usage when watching YouTube in 1080p. Meanwhile Chrome on Windows eats maybe 6-10%.

How is this not #1 priority to fix?

[magicalhippo]

Not much FF can do directly AFAIK, since it has to do with the hardware decoding the drivers support.

I've used an addon for a while which fixed it by forcing YouTube to serve h264 rather than vp9 content, as hardware accelerated decoding of h264 worked but not vp9. But lately it hasn't worked well. Haven't investigated if it was due to newer content only being vp9 or if the addon stopped working.

[GrayShade]

I think it's a conflict with the sandbox, like it https://bugzilla.mozilla.org/show_bug.cgi?id=1698778.

[muizelaar]

I'm pretty sure most users don't have this experience. Can you post a link to a pastebin of your about:support or file a bug?

[TingPing]

This is normal. Firefox is only now rolling out accelerated decoding on Linux.

[roca]

Comparing across platforms is not a good idea. Different drivers, APIs and platform OS issues dramatically affect these results.