Being in the computer field and being an online application developer I am often asked which browser I use. The answer is, all the major ones. I have Internet Explorer, Safari, Chrome, Firefox and Opera all installed on my office computer (Windows Vista). On my home desktops (Windows 7) I have Internet Explorer, Chrome and Firefox. On the PowerBook I have Safari and Firefox. On the Asus Netbook and my Windows XP test machine I only have IE (versions 7 and 8). The iPad and iPod are of course running Safari.
Of course now you will ask, "Yes, that is what you have installed, but what do you use?" The answer is, all of them! For example, at work there is a web cam I need to access, but the interface will not work with either Chrome or Firefox so I have to use IE for that page. I also have a time sheet program that is my homepage in Chrome that I open and then keep that page open all day. Etc., yes, I use them all and when I am working on a site design, I make certain I can view the site on everything I have. If I can get the site to look right on all I have, I have never had a complaint from a client saying it didn't look or work right for them.