[tbb-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:  Very High                            |         Status:  new
Component:  Applications/Tor Browser             |      Milestone:
 Severity:  Major                                |        Version:
 Keywords:  6.0a5, video, media, mse,            |     Resolution:
  mediasource, noscript, placeholder             |  Actual Points:
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by potato):

 I don't think this bug is related to the fact that "mediasource:" is
 whitelisted in NoScript's settings. Removing that item from
 "noscript.default" and "noscript.mandatory" and
 "capability.policy.maonoscript.sites" in about:config has no effect, the
 bug is still present. Also, "mediasource:" was whitelisted in Tor Browser
 5.5.5, which didn't even have this bug.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19200#comment:1>
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