Firefox Plug-in!

Ok, I have just reinstall my windows.
I finished installing Firefox and all add ons I Install” shockwave , WMP , Flash 9 , Acrobat Reader , Java , QT , RP ” but one is missing.
I missing one Firefox plug-in that shows playlist music like in the myspace playlist if u know what im talking bout.
In the internet explorer its OK and looks like this,
But in the firefox look like this,

So,, anyone can help?!
Edit : Whoops.. Sorry i’ve post it in wrong section! someone report please
Answer #1
Moved to Helpdesk
Answer #2
https://addons.mozilla.org/en-US/firefox/addon/5709