[colug-432] enabling PepperFlash in Firefox

[Rob Funk]

Rick Troth wrote:
> We've had some trouble lately with video at particular web sites.
> Twitter serves as the poster child. Most tweets with video say "browser
> does not support video". (So how come YouTube works?)

YouTube offers many different formats, in their attempt to make things
work. See https://www.youtube.com/html5 for information about how
YouTube support matches up with what your browser supports. As far as
I can tell, Twitter uses only H.264 video encoding.
https://support.twitter.com/articles/20172128

If that YouTube page shows that you're missing H.264 support (which is
my guess), this page may help:
http://www.fadvisor.net/blog/2015/05/html5-and-h264-for-firefox-on-linux/

Other googling I've done indicates that adding plugins to Gstreamer
may help.