Flash?

[Ralf Mardorf]

On Tue, 2013-04-23 at 21:37 +0200, Fernando Apesteguía wrote:
> That's an issue with Firefox. Search the list. There is a setting you have
> to change in Firefox in order to avoid that problem.

Perhaps the answer is somewhere in the thread "[Solved] Youtube & Flash
Videos broken?", but OTOH, Flash is outdated and that could be the issue
too.

I don't have Flash or Gnash installed, but Firefox (20.0.1 here) anyway
plays many YouTube videos.