Then if you are using Safari, install click-to-flash. It disables Flash until you ask for a specific flash program to run. It also disables Java until you ask for a specific Java applet to run. It is a time, cpu and battery saver, it disables crappy animated ads (except animated gifs which are harmless) and saves you from getting pwned by malicious flash which would be just as bad as getting pwned by malicious java.
Thank You.