How to stop Flash movies/ads on Web sites playing automatically

I hate it; you visit a website and some unwanted Flash movie starts playing automatically. You can fix this by blocking Flash altogether, but that’s cutting off your nose to spite your face. A better solution is to use the free Firefox "Stop Autoplay" extension. It not only stops movies from playing automatically, it also gives you the option of playing them if you wish.
http://hemiolapei.free.fr/divers/sap/sap-en.html
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