Firefox + GB's Youtube Videos Fullscreen?

I use Firefox & I have recently been playing some Giantbomb videos on Youtube. When in fullscreen screen the video noticeable chugs. But I don't get this with other videos on Youtube.

Anyone else have this issue?

I've had that problem for a long time but it wasn't only with Giantbomb. Gave up looking for a reason and just started using Chrome.

HTML5 or flash?

@hmoney001: @lv4monk: @gatob:I too have a lot of issues on fullscreen in Firefox. One of the many reasons I went to Chrome. Firefox doesn't play nicely with multiple windows/monitors and full screen video.

As hmoney asks, curious what mode you are using? HTML or flash.