Someone correct me if I'm wrong but I believe the so called popup killers do nothing at all to modify the behavior of sites that inflict the popups on us. What they do is place a watcher inside your PC, between your screen and your Internet connection. All the popups are still sent to your PC and still waste the same bandwidth they always did, it's just that you don't see them pop up anymore. The down side is that the watcher uses additional local PC resources reviewing everything that comes down the wire to see if it's a popup window or not.

      - Mark