YouTube video plays in TB9 with ThunderBrowse but not in FF9

Using FF I have joined the HTML5 trial and can play many of the videos,
although some still claim to require Flash.

I have also been able to play some YouTube videos in TB's message pane
with ThunderBrowse.

This one, however

http://www.youtube.com/watch?v=rqN_nXee4-I&noredirect=1

plays in TB9+ThunderBrowse but without sound

and will not play at all in FF9.0.1

Any idea why this is happening?

Alan
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