maintainer-feedback requested: [Bug 244793] www/firefox: update to 75.0 (phase: Beta, ETA: 2020-04-07)

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Bug 244793: www/firefox: update to 75.0 (phase: Beta, ETA: 2020-04-07)
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244793



--- Description ---
See review D24062 for the patch.

Hardware video decoding how-to:

0. (optional, hybrid VP9 on Skylake) Build libva-intel-driver with HYBRID=on
then export LIBVA_DRIVER_NAME=i965
1. Start a Wayland compositor e.g., Sway
2. Enable native Wayland support: export MOZ_ENABLE_WAYLAND=1
3. Enable WebRender: export MOZ_WEBRENDER=1 or gfx.webrender.all=true in
about:config
4. Enable VAAPI: widget.wayland-dmabuf-vaapi.enabled=true in about:config
5. Disable bundled FFmpeg: media.ffvpx.enabled=false in about:config
6. Play a H.264 or VP9 video e.g., https://www.youtube.com/embed/hVvEISFw9w0
?. Diagnose via export MOZ_LOG=PlatformDecoderModule:5 (look for "VA-API"
string)

On X11 just run Firefox within a Wayland compositor nested on top of
xorg-server e.g.,

  $ cat /tmp/sway.conf
  exec firefox https://www.youtube.com/embed/hVvEISFw9w0

  $ MOZ_LOG=PlatformDecoderModule:5 sway -c /tmp/sway.conf |& fgrep VA-API
  [Child 6778: MediaPDecoder #2]: D/PlatformDecoderModule Initialising VA-API
FFmpeg decoder
  [AVHWDeviceContext @ 0x83063cac0] libva: VA-API version 1.6.0
  [Child 6778: MediaPDecoder #2]: D/PlatformDecoderModule VA-API FFmpeg init
successful
  [Child 6778: MediaPDecoder #2]: D/PlatformDecoderModule Choosing FFmpeg pixel
format for VA-API video decoding.