Firefox 121 stable can enable HEVC via flag #6930
Merged
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2nd phase of #6858
I rolled back my Firefox to 120 once but could not play HEVC even with the flag.
10bit or higher colors are not supported.
https://bugzilla.mozilla.org/show_bug.cgi?id=1839107
https://codepen.io/danm8675123/pen/abNavqG