[tor-bugs] #18862 [Applications/Tor Browser]: Make sure the Presentation API is no risk for our users

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#18862: Make sure the Presentation API is no risk for our users
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 Reporter:  gk                                   |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ff52-esr, tbb-7.0-must-alpha,        |  Actual Points:
  TorBrowserTeam201704                           |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by arthuredelstein):

 In ESR52, the Presentation API is still disabled by prefs
 (dom.presentation.enabled = false and similar). I manually confirmed,
 using the consoles, that window.PresentationRequest is not exposed in
 content or chrome javascript. I also searched on dxr.mozilla.org and
 didn't find any place where we would expect a PresentationRequest to be
 activated, except in tests.

 We could also potentially try to rip out the DOM Presentation code, but I
 already feel reasonably comfortable that the Presentation API code won't
 be running.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18862#comment:6>
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