Well, I've used Firefox exclusively for a week, but it just failed to stop a million popups even though I have the option checked. There are going to be times when someone deliberately posts a malicious link like that, and I expect my browser to do what it's supposed to do. At least killing the Firefox process killed all of the popups. I would have expected the popups to open up in the main window as well, not behave like IE(don't see a way of setting this as the default). I'm done testing Firefox and going back to Opera.
Aside from that, there are only a couple aspects of Firefox I don't like. I downloaded easyGestures, but Opera's mouse gesture system is still far better(as in less fluff and it does what I want faster). I suppose easyGestures could be changed, but right clicking a link should default to the standard menu. When I go back or forward, Firefox reloads the page rather than using the cache. I didn't find a setting to change this. I think Opera's password manager is also superior. Firefox has a nicer look and a lot of potential for expansion, but I found myself missing Opera functionality. Anyway, the popup thing pretty much decides it.