[ubuntu] Firefox 11 no videos

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http://ubuntuforums.org – I just upgraded to Firefox 11 with Update Manager, and now I cannot play videos of any type in Firefox. I am on Ubuntu 11.10x64. I have Flash Aid 2.2.3 installed. I tried using the Wizard mode of that, but all it did was remove the existing Flash plugin and reinstall the same one: Version 11.1r102. If I run Check Update, I get a message saying there are no no flash updates at this moment. How can I get flash back so I can play videos in Firefox 11 or revert back to Firefox 10? (Hardware)