Note: ClickToFlash is now finished according to the developer: "Due Apple's new development policy, version 3.2 of ClickToPlugin is the final version." This also applies to ClickToFlash. ?
ClickToFlash allows you to customize the extension so that Safari does not launch the Flash plug-in by default.
It replaces Flash objects with an unobtrusive placeholder, which can be clicked to load Flash content. It can also replace Flash-based media players with Safari's native HTML5 player.