I upgraded from 9.04 to 9.10 and now I cannot play embedded youtubes. Youtubes from the youtube site itself play ok.
Using a tip about about

lugins from someone on the firefox list I discovered the following plugins are in use:
/var/lib/flashplugin-installer/npwrapper.libflashplayer.so
application/x-shockwave-flash Shockwave Flash swf
application/futuresplash FutureSplash Player spl
/usr/lib/mozilla/plugins/libtotem-cone-plugin.so
video/flv Flash video flv
So... one plugin plays youtube itself and the other fails to play embedded youtubes?
jfl@ws3:~$ uname -a
Linux ws3 2.6.31-21-generic #59-Ubuntu SMP Wed Mar 24 07:28:27 UTC 2010 x86_64 GNU/Linux]
jfl@ws3:~$ firefox -version
Mozilla Firefox 3.5.9, Copyright (c) 1998 - 2010 mozilla.org
Any help would really be appreciated.
Still wish I had never hit the upgrade button.