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I tried Firefox a few weeks ago on a 2015 MBP plugged into a 4K tv, it could basically not play any high res video at any watchable framerate. Safari did the be

by fooker 3y ago

I tried Firefox a few weeks ago on a 2015 MBP plugged into a 4K tv, it could basically not play any high res video at any watchable framerate. Safari did the best, Chrome was close.

mrguyorama 3y ago
I also had a 2015 MBP and watched 4k video on it basically every day. I have no idea what you experienced.
- fooker 3y ago
  That's exactly how software bugs work, weird setup specific issues that are expensive to triage and fix. But if you are not convinced see how many others have this issue by googling "site:reddit.com firefox stuttering on 4k video on mac"
nateb2022 3y ago
See https://bugzilla.mozilla.org/show_bug.cgi?id=1716164 https://bugzilla.mozilla.org/show_bug.cgi?id=1716164 My guess is that Firefox was being served AV1 by YouTube. Intel chips prior to 11th gen have no hardware decode support for AV1, and so your CPU was overworked and bottlenecking. Chrome and Safari probably resorted to H.261/H.263/H.264 encoded video from YouTube, and relied on the hardware decoder. Easy fix: go to `about:config` and disable `media.av1.enabled`.