C6 firefox esr h.264 support on youtube

[Robert Arkiletian <robark@xxxxxxxxx>]

I was able to get h.264 support on www.youtube.com/html5 on fedora 21 by
installing

gstreamer1-libav

but that package does not exist in C6 (or it's popular third party repos)

What is the name of the package which adds h.264 to firefox on
youtube/html5 in C6?
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