[Bug 1643467] Re: Firefox 50 blocks Ubuntu 14.04 LTS's version of libavcodec

[R.Zimmermann]

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

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