Keep in mind that Firefox AFAIK still relies on OS codecs for h264 because shipping it themselves is such a difficult proposition due to patents. And on Windows, if you want native HEVC or AV1 playback you have to buy it from the store, it doesn't ship with the OS.
But if you follow the link below to the Windows store, you can download it for free!
ms-windows-store://pdp/?ProductId=9n4wgh0z6vhq
Found out on Howtogeek
https://www.howtogeek.com/680690/how-to-install-free-hevc-co...
i guess the worry then is that HEVC crowds out AV1/others, and this Chrome change is setting the stage for it to become a broad tax on video? i could buy that angle.
I'd edit my original comment to note it being false, but apparently I'm outside the HN edit window :-/
a reasonable person might conclude that patents are a bad thing as a result. like it or not, HEVC is patented and that’s not changing anytime soon: but do we decide to develop tools around it, or banish it?
that any users actually went through the awful UX of downloading codecs is some evidence that mp3 support was valuable to them. is this still the case, today with HEVC, or not?
if the argument was really as simple as “HEVC is bad UX”, we wouldn’t have this discussion: nobody would use something with bad UX if they didn’t feel compelled to for some other reason. why anyone would feel compelled to, is the more interesting discussion.