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[tor-bugs] #19037 [Applications/Tor Browser]: Suppress content access to page visibility API

#19037: Suppress content access to page visibility API
-------------------------------------+-------------------------------------
     Reporter:  arthuredelstein      |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-linkability,
     Severity:  Normal               |  TorBrowserTeam201605
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
-------------------------------------+-------------------------------------
 The `document.visibility` property and the `visibilitychange` event let
 content know if the user has selected or deselected a tab. If the user
 switches from tab A to tab B, then tab A can observe a "hidden" event at
 the same time that tab B receives a "visibile" event. So it seems
 potentially useful to suppress this information.

 See https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19037>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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