Oh are there pop-ups? I have not had any experience of Firefox pop-uppings..^^ I couldn't open some sites in Internet Explorer and had to kept refreshing it untill I downloaded Firefox and that ff did all I need. The latest version which was automatically updated by my setting is even better. Image downloading time becomes more faster and also images will open from top to bottom which is a more convenient way of downloading images for any users.

I haven't had any complaints with firefox.

The only problem I should say is that some plugins which are already installed in the systems like flash players and others needed to be installed separately for firefox which could have been shared with internet explorer for they use the same system. Overall firefox is the best according to my experience.