You're not serious, are you? if you're developing for a large company you almost always have to support IE--like it or not. I've developed for several large companies and all heavily rely on Microsoft tools. Some of the users that I support have never heard of Firefox or are even aware that there is a rift between browsers. Their page needs to display on a browser *period*. CSS looks different on both so I HAVE to develop for IE because that what most users have and know.