TorBrowser 5.0a1 segfaults on embedded mp4 video due to gstreamer on EL6

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)