[Bug 1889784]

[W-jan-k]

[Tracking Requested - why for this release]:

This regression affects:
* MOZ_ENABLE_WAYLAND=1 users with Firefox 79,
* MOZ_X11_EGL=1 and MOZ_ENABLE_WAYLAND=1 users with Firefox 80.

Everyone is excited that Firefox 80 finally supports VAAPI hardware
decoding on X11, it got news coverage, etc., but those who tested it
know that it suffers from at least two fatal bugs. (bug 1645672 is the
other one.) Wayland/MOZ_X11_EGL and VAAPI are still experimental and
disabled-by-default, but it's a killer feature that brings users back.
Therefore please consider uplifing this into beta, and even into a dot
release, if there is any.

Downstream Fedora applies this patch on Firefox 79:
https://src.fedoraproject.org/rpms/firefox/c/cd18e999f576523b6b3f2076bca625d5e04d1178?branch=master

https://www.reddit.com/r/archlinux/comments/i0ireu/firefox_developer_edition_hardware_video/fzpojad/
https://www.reddit.com/r/flatpak/comments/i157dm/green_flashes_in_video_in_firefox/
https://www.reddit.com/r/linux/comments/i04cvr/psa_firefox_79_appears_to_break_vaapi_decoding_on/
https://www.reddit.com/r/firefox/comments/i1p2ct/linux_vaapi_video_decode_acceleration_unreliable/

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https://bugs.launchpad.net/bugs/1889784

Title:
  Hardware-accelerated video decoding (VA-API) broken in Firefox 79
  (Wayland)

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