[tor-bugs] #16026 [Tor Browser]: TorBrowser 5.0a1 segfaults on embedded mp4 video due to gstreamer on EL6

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#16026: TorBrowser 5.0a1 segfaults on embedded mp4 video due to gstreamer on EL6
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 Reporter:  hiviah       |          Owner:  tbb-team
     Type:  defect       |         Status:  new
 Priority:  normal       |      Milestone:
Component:  Tor Browser  |        Version:  Tor: unspecified
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
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 TorBrowser 5.0a1 segfaults if a page has video tag with mp4 source. It's
 caused by gstreamer.

 Example page: http://www.download3k.com/articles/Imgur-Converts-Animated-
 GIF-Files-To-MP4-Videos-With-GIFV-Format-00783

 Workaround:

   1. set media.gstreamer.enabled = false in about:config, or

   2. disable video tag with NoScript

 OS/distro notes:

 - EL6 (Scientific Linux 6.6) - segfault
 - Ubuntu 14.04 - seems to disable replay altogether - "MIME type not
 recognized" (I might be missing the right gstreamer plugins)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16026>
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