So I have Firefox 5.0 right now, and I've noticed that YouTube isn't working. By that, I mean the pages are loading fine, but the actual video player won't appear. I just get a black box. Anyone else have this problem / know how to fix it?
I had this exact problem a few days ago. Changing the URL to https instead of http would force the video to load but it was a clunky solution. Seems to have fixed itself in the meantime, however.
If no one gets back to you in that bug within a week, I'd file a new one in the Layout: Tables component. I don't recognize any of the people subscribed to that bug as current Mozilla contributors. Filing it anew would get the attention of the people who watch the component. (And then they'll probably promptly dupe your bug back to one of the old ones on file and it might die for two years again... )
It turned out to be a weird communication problem caused by changing servers within the same hosting provider, but the new server and the old one weren't in sync with each other somehow. Updated the site code, problem went away.
I'm seeing no problem on the same FF, XPSP3, though I have adblock, RTSE, and a few script additions (courtesy of Wes ) that do a few things like hide the side bar. Also, not using beta RT skin, which may make a difference.