Firefox and FireBug make a great combination. It makes working with Watir nice and easy. Unfortunately, some apps refuse to work with FireFox (IBM Maximo and Oracle SPL Customer Care and Billing, aka: “CC&B” are examples), so MSIE is the only option. Fortunately, there is a toolbar that you can install to get a watered-down Firebug equivalent; it’s called the “Microsoft Internet Explorer Developer Toolbar”. Get it here.