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Fix seems be fine on 14.04. After a couple of hours of use I'm
experiencing neither warnings nor problems playing videos.

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https://bugs.launchpad.net/bugs/1643467

Title:
  Firefox 50 blocks Ubuntu 12.04 and 14.04 LTS's version of libavcodec

Status in libav:
  Unknown
Status in firefox package in Ubuntu:
  Confirmed
Status in libav package in Ubuntu:
  Invalid
Status in firefox source package in Precise:
  Confirmed
Status in libav source package in Precise:
  Confirmed
Status in firefox source package in Trusty:
  Fix Released
Status in libav source package in Trusty:
  Fix Released

Bug description:
  Whenever it tries to play a video, Firefox 50 displays this message at the top of every page:
  "libavcodec may be vulnerable or is not supported, and should be updated to play video"

  https://dxr.mozilla.org/mozilla-central/source/browser/locales/en-
  US/chrome/browser/browser.properties?q=%22libavcodec+may+be+vulnerable%22&redirect_type=single#742

  Firefox refuses any libavcodec version prior to 54.35.1 (unless
  media.libavcodec.allow-obsolete==true).

  https://dxr.mozilla.org/mozilla-
  central/source/dom/media/platforms/ffmpeg/FFmpegLibWrapper.cpp#60

  Users should not be subjected to this warning, as it is vague (does not instruct them how to fix it).
  Ubuntu 14.04 LTS should ship with an updated version of libavcodec.

  DistroRelease: Ubuntu 14.04
  Package: firefox 50.0+build2-0ubuntu0.14.04.2

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