If you don’t use or know what Mozilla Firefox is, then you should get familiar with it. Mozilla is a free web browser that is very customizable and has add on features for everything you can think of. One of those add-ons is Firebug. If you program in CSS and haven’t tried it, you are missing out. Firebug is not a builder, but will show you what your code is doing when and if you have a problem. Another free program you should have if you build a web page is Notepad++. If you use regular notepad for anything code related, it will make life just a little bit easier.