[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 gk):

 Oh, and there might already have been a fingerprinting vector before this
 change got implemented, see:
 https://bugzilla.mozilla.org/show_bug.cgi?id=1230265#c43
 {{{
 We're increasing the number of users for whom we're enabling VP9 from
 about 10% (people who don't have H.264) to 50% (people with fast enough
 machines).
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22548#comment:11>
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