Adblock for Safari.
You will find the Safari version here: http://burgersoftware.com/
P
I'm on Max OSX 10.5.8 with Firefox 8.0.1. Have my pop-ups blocked, but still have unencrypted data showing when I log on to my Comcast email acct. Understand this is different from a pop-up, but don't know how to change my settings so I don't have them showing. They are usually adds re home financing with action items on the screen.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic