Internet Explorer vs Mozilla Firefox

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I use Internet Explorer as a site browser because this is what I knew from the start. IE is a user-friendly browser. But, recently I have been attacked of many kinds of viruses, trojans, and spywares. Someone told me that Mozilla Firefox is safer to use than IE. It has less pop ups. So I tried to use Mozilla Firefox. I downloaded and installed it. But when I tried to surf the net. I encountered a site that I can not open using firefox but I can open this site when I used IE. So I uninstalled Firefox and continued to use IE. What are the PROs and CONs of this two. Can someone enlighten me? THanks.!!