What I like about Popup Stopper is that there is virtually no configuration. If you want to allow a popup (even opening a link in a new window) all you do is CTRL+click to allow it for that one instance. That may seem like an inconvenience, but I find that I have gotten so used to it, that I generally CTRL+click even on systems that do not have it installed. It becomes almost second-nature. The one application that I mentioned I have constant problems with is ZoneAlarm (Pro). Since the inclusion of the "privacy" crap (version 3.x?) - above and beyond the firewall, there are several places on the net where I have to shutdown ZA entirely in order to access some of the portions site; even with all the cookie, mobile code, privacy, etc, settings shut off. Not the behavior you would want in a firewall. IMHO, ZoneLabs should have left the privacy to others and concentrated on the firewall.