Assuming you have the Google bar, assuming you don't type : "Firefox" in one of the spyware bars, assuming your IE isin't highjacked .... then yes Firefox might have been a bad example, I agree, but that's not true for every software out there, sometimes the download page will offer let's say : Apple or Windows Version, and the user won't know what to do.
P.S. : Just went to the Firefox download page, along with the green big download Firefox 3.5 button, there is a shit load of links. Believe me, users can stall at nothing, even seeing a shit load of options to click on a web page. Some will try to read them for no reason at all or some reason like, well the thing came up, I read from left to right and up to down, by the time he reaches the middle of the page(Where the button is), he is long gone man.