Firefox and Chrome/Chromium use software video decoding by default. They
might also have "hardware acceleration" options for you to try, but to
the best of my knowledge they don't do properly efficient hardware
decoding. So this is a bug (two bugs) in the web browsers.
For a proper future
** Package changed: xorg-server (Ubuntu) => firefox (Ubuntu)
** Also affects: chromium-browser (Ubuntu)
Importance: Undecided
Status: New
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