Ubuntu Intrepid, Firefox and Flash

After upgrade from Ubuntu hardy to intrepid last year, i had nearly every day problems playing embedded flash on websites.
I hate it, but it was not my first priority to solve and a Firefox restart solved it every time.

Suddenly i found this simple solution: http://ubuntuforums.org/showthread.php?t=967049

apt-get remove flashplugin-nonfree
apt-get install ubuntu-restricted-extras


Works fine now. I can see all content from slideshare and youtube.