This is not new, I'm just tired of it.

I cannot seem to watch You Tube movies using Firefox 3.5.18,
it works fine when I try to watch the same movie using Seamonkey 2.0.11.

When I go to a link using, Firefox, I see:

"Undefined's Channel, Subscribe, and Uploads" below the movie, I see:

"Warning: this video is not set to use HTML5. If you have not, go to http://www.youtube.com/html5 and join the beta."

I've joined the beta, and still see this.

This is Mint Linux 10, 64-bit, and not an issue on my laptop, Mint Linux 9, 32-bit.

Could Firefox simply need updating?

Considering 3.5 is rather old, the current Firefox is 7.0.1, don't think 3.5 supported html5.

1 members found this post helpful.

Updating Firefox did the trick.