The latest versions of Mozilla (and quite likely its offspring) have a stop-pop-ups option in the Preferences.

The Apple browser, Safari, also has the option, right into the Safari menu, not even hidden in the preferences (which to be honest are quite skimpy). Safari however only works for the latest Mac OS X versions.

P.S. If I don't move it first maybe someone else will move this to the new General Advice forum, I don't at this time only because I'm replying without being logged in.

P.S. 2: Luscious Ghost!
I'm moving this to "No Certainty Attached" and leaving a "ghost" link in the Lounge


P.S.3, actually what's left behind is called a "shadow" by ezboard, but since it isn't Cabinet shaped I couldn't justify using a Churchy name in the PS2, or maybe I just forgot the name?:)