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["R.Zimmermann" <1643467@xxxxxxxxxxxxxxxxxx>]

For me, Firefox (50.0 on Ubuntu 14.04) not only shows the warning, but also seems to prevent embedded .gif/.gifv animations from playing, at least on Reddit and Twitter.
Example: Almost every video on https://www.reddit.com/r/gifs/
After clicking the Play button, the video will "load forever" or show a still image.

It worked in previous FF versions, or works when setting
media.libavcodec.allow-obsolete=true (which I don't want to do
permanently).

It also works *sometimes* if the URL is pointing directly to the GIF
file.

Would appreciate if the fix for 14.04 could get a higher priority.

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

Title:
  Firefox 50 blocks Ubuntu 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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