Firefox 50 blocked versions of libavcodec older than 54.35.1 while Trusty still has libavcodec54

[Amr Ibrahim]

Hello everyone,

Firefox has got updated to version 50 in Trusty and later. In the 
changelog, Firefox 50 blocked versions of libavcodec older than 54.35.1 
while Trusty still has libavcodec54. In Trusty, I can see a message bar 
in Firefox below the address bar saying "libavcodec may be vulnerable or 
not supported, and should be updated to play video." This message 
appears on websites containing videos. And I think Firefox then tries to 
use the Adobe Flash plugin to play video.

Does anyone else have this message? What is the situation now? Will 
Firefox 50 in Trusty stop playing videos?

Regards,
Amr