[tor-bugs] #19200 [Applications/Tor Browser]: HTML5 video not blocked with placeholder, plays automatically

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#19200: HTML5 video not blocked with placeholder, plays automatically
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 Reporter:  potato                               |          Owner:  tbb-
     Type:  defect                               |  team
 Priority:  High                                 |         Status:  new
Component:  Applications/Tor Browser             |      Milestone:
 Severity:  Major                                |        Version:
 Keywords:  tbb-security-slider, tbb-6.0-issues  |     Resolution:
Parent ID:                                       |  Actual Points:
 Reviewer:                                       |         Points:
                                                 |        Sponsor:
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Comment (by cypherpunks):

 according to https://developer.mozilla.org/en-US/docs/Web/API/MediaSource
 the change happened in firefox 42.0 where `media.mediasource.enabled` is
 set to `true` by default. setting it to `false` reverts this to the
 previous click-to-play functionality.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19200#comment:6>
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