My normal browser is Firefox 3.5.8. One real nice thing is some of the add-ons; especially Ad Blocker 0.6.7 which disables the Google ads which show for most people on the top and bottom of each page of DisBoards.
However, I also have Internet Explorer 8.0.7600 as at least one web site I use often needs IE for certain features and Intuit's Professional verson of Turbo Tax requires IE for updates and certain other uses.