Yipee, the Flash Player beta is out for Linux.
- Get the Installer for Linux
- tar xzvf FP9_plugin_beta_101806.tar.gz
- cd flash-player-plugin-22.214.171.124
- locate libflashplayer.so (On Ubuntu it's often in /usr/lib/firefox/plugins/)
- sudo cp /usr/lib/firefox/plugins/libflashplayer.so /usr/lib/firefox/plugins/backup.libflashplayer.so
- sudo cp libflashplayer.so /usr/lib/firefox/plugins/libflashplayer.so
- restart firefox and you should be good to go.
The audio lag in movies seems to be gone now. Not certain about stability yet, but it can't be worse than before.