Firefox 6 doesn't play most videos, why?

Videos, used to play, if sometimes slowly, but since the upgrade to version 6 almost none play, not youtube or Flixy, or jazz videos, or brasscheck videos.
is there a workaround for this?
Can I revert back to V5 somehow?
Thanks,
noaxetogrind

Have you tried the steps at [http://www.roboform.com/support/faq/roboform-v7#faq_firefox http://www.roboform.com/support/faq/roboform-v7#faq_firefox] ?
Firefox 5 is not recommended for security reasons, but if you don't want 6.0 you can try 3.6.x: [http://www.mozilla.org/en-US/firefox/all-older.html]

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