If you are using Mozilla Firebird, you want to go install Flash Click to View, an oddly named, but marvelously effective extension. It only does one thing, but it does it beautifully. It replaces all Flash content with an empty box that says “flash [[Click to play]]”. Of course, clicking the box plays the Flash. This extension plus the menu pick “Block images from this server” together mean that I see virtually no ads. Bliss.