google found this
http://www.google.no/search?q=disabl...S:ohmy:fficial
not quite what you want but im sure youll find other solutions
"this is how you block background sounds:
put this in your userContent.css file:
/* block embedded sounds */
embed[src*=”.mid”] { display: none !important }
embed[src*=”.mp2”] { display: none !important }
embed[src*=”.mp3”] { display: none !important }
embed[src*=”.mp4”] { display: none !important }
embed[src*=”.wav”] { display: none !important }
embed[src*=”.wma”] { display: none !important }
this will block anything in an embed tag with .mid … in it. unlike adblock, you can still search for mid on google
and download mp3’s from a direct link, etc. you can also use this to block embedded mov, mpg, etc.
(on windows, you can find that here: C:\Documents and Settings\Administrator\Application Data\Mozilla\Firefox\Profiles\xxxxxx.default\chrome\userContent.css)
(you have to create that file, it won’t be there if you haven’t already)
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