[tbb-bugs] #21224 [Applications/Tor Browser]: Youtube fullscreen errorr in TBB fullscreen mode on MacOS 10.12

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#21224: Youtube fullscreen errorr in TBB fullscreen mode on MacOS 10.12
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     Reporter:  exatto                    |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 Since the window resizing logic was updated in the 6.5 alphas there is a
 problem with fullscreen videos on Youtube.
 I'm on a fully up to date MacOS Sierra installation and when I put the Tor
 Browser in the native Mac fullscreen mode and then put a Youtube video in
 fullscreen from that window it only shows in a small rectangle in the
 upper left corner of the screen.
 Other websites with video players don't have this problem.

 When I take Tor Browser back out of its fullscreen mode then the Youtube
 video works fullscreen as normal again but it seems it is overlaying the
 window and not using the native Mac fullscreen apis.

 I can make a screenshot if necessary but it should be easily reproducible.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21224>
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