Firefox Web Developer Add-on is a MUST!!!
Personal experience, leads me to believe that anyone who claims to be a web designer/programmer must have this add-on (in firefox of course - if you’re still using IE then you need to throw away your computer and buy a calculator). It can easily solve any dilemma you run into including styling, viewing form information, easily clearing and viewing session cookies and much more nifty little tricks that will help you to get the perfect website to match your designs.
