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>> Something must be broken in FF9.0.1 because other YouTube videos that
>> I've played many times over with earlier versions of FF now will not
>> play. Yes, it does show that I am in the HTML5 trial. E.g.:
> Try deleting the media-cache files in %TMP% then reload youtube with
> ctrl-F5 or hold down the shift key while clicking reload.
Thanks for the suggestion. I tried all of those, but I still get the message
"The Adobe Flash Player or an HTML5 supported browser is required for
When I go to the YouTube html5 page, under the heading
What does my browser support?
I see a white-on-green "Video tag" with a check mark, and white-on-red
"h.264" and "WebM" with exclamation marks.