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> unless hevc webm webp avif not widely supported this is the way to go
The latest firefox can play hevc on Linux now.
https://developer.mozilla.org/en-US/docs/Web/Media/Guides/Formats/Video_codecs#hevc_h.265

Build 137 which was released less than a month ago is when it happened.
https://caniuse.com/hevc

I just tested this a few minutes ago, and I can confirm it works.