[vetinari]

Never seen this; however, youtube prefers pushing VP9 over H.264. Maybe your computer cannot use hardware decode for VP9 and can for H.264? (Since you mentioned, it is an older one). Maybe the h264ify extension would help.

What firefox cannot do and chrome can is HDR playback.

[jasode]

> however, youtube prefers pushing VP9 over H.264. Maybe your computer cannot use hardware decode for VP9 and can for H.264?

No, even if I download the 4k 60fps file using yt-dlp with forced h264 codec settings locally to my harddrive, Firefox still can't play the mp4 file smoothly.

So it's not really a streaming issue or h264 vs VP9 codec issue. The Firefox core engine doesn't seem optimized to playback 4k and 8k high-frame-rate videos with low cpu utilization. Even VLC for 4k and 8k isn't as smooth as Chrome. I don't know what the Chrome team did but they really optimized that code path to play back hi-res videos.

[iforgotpassword]

Interesting, I recently had the opposite experience. Wanted to enable hw decode on an older Intel system and only got it to work on Firefox. Tried several different instructions from the web on how to force chrome to ignore any blacklists for drivers or anything, but still no luck.

Oh and a while ago I noticed (on a more modern system) that enabling hw decode makes chrome ignore the aspect ratio of the video and displays it like the pixels are square. Again Firefox handled it fine.

(Linux, h264 in both cases)

[knappe]

YouTube is routinely broken for Firefox, especially when navigating around in places like shorts. I actually find this to be a feature because it prevents me from continuing to mindlessly consume. But it is broken.