When I play a youtube video in Safari the whole program freezes up, and I can only hear the video's sound playing choppy with no way to stop it.

That started months ago so I only use youtube in Chrome.

Now Chrome doesn't work either -going to youtube freezes the whole program, before I can even press play.

Anyone else experiencing this with up to date internet browsers Mac Pro 10.6.8? I guess I need to download firefox.