If the only thing you do is open one web page at a time browse a bit and close, you will not feel any difference between firefox and explorer. Firefox real power is in its flexibility and add-ons.
My firefox has split screen FTP in it (that opens in a regular tab) email checkers, advanced downloaders, easy image zoom inside web pages, script blocker and spell checkers in English and Hebrew. There are a billion add-ons available to suit every need, to fit things that you didn't know you needed and some you don't need at all but are still cool. The extra security is just the cherry.
It is not like you will go WOW when you try it. Explorer already copied all the important features that Firefox had years before, but it is still better especially if you are a heavy user.