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[Norbert <1643467@xxxxxxxxxxxxxxxxxx>]

Ubuntu 12.04 LTS is affected too (Firefox 50.0.2). 
IMHO it is time to include ESR versions of Firefox to Ubuntu LTS instead of bleeding-edge versions.
For example current Firefox ESR 45.5.1 does not show this error.

** Summary changed:

- Firefox 50 blocks Ubuntu 14.04 LTS's version of libavcodec
+ Firefox 50 blocks Ubuntu 12.04 and 14.04 LTS's version of libavcodec

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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 firefox package in Ubuntu:
  Confirmed
Status in libav package in Ubuntu:
  Confirmed

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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