[tbb-bugs] #22548 [Applications/Tor Browser]: Firefox downgrades VP9 videos to VP8 when measured performance is not enough

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#22548: Firefox downgrades VP9 videos to VP8 when measured performance is not
enough
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 Reporter:  cypherpunks                   |          Owner:  tbb-team
     Type:  defect                        |         Status:  reopened
 Priority:  Medium                        |      Milestone:
Component:  Applications/Tor Browser      |        Version:
 Severity:  Normal                        |     Resolution:
 Keywords:  tbb-fingerprinting, tbb-easy  |  Actual Points:
Parent ID:                                |         Points:
 Reviewer:                                |        Sponsor:
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Comment (by cypherpunks):

 Well, then `+  return true;`, of course. Unfortunately, setting
 `media.mediasource.webm.enabled` to `true` doesn't work. Dances with HWA
 detection are for Mozilla only, Tor Browser has all HW decoders disabled.
 Therefore, enabling VP9 unconditionally is the only way for it (this
 affects mobile, but reduces fingerprint). This also fixes the issue from
 your second comment.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22548#comment:12>
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