I’ve been having issues with Flash videos (youtube, etc) freezing off and on for awhile… this only happens in Firefox (Internet Explorer works fine).
After doing some research, I found that this problem happens in all versions of firefox including the Linux version. The quick fix that seems to work is to disable Java by going to Tools -> Options -> Content -> Disable Java. This method appears to work.
Further research revealed that upgrade to the new Flash 10 engine should also fix the problem and you can leave Java enabled… so I tried this and it works!
Here’s the link to the new Flash 10 package: http://get.adobe.com/flashplayer/