Hey goggly, Here is a list of the plugins i feel are crucial for any developer/designer/internet marketer, followed by what keywords to search for on Mozilla's add-ons page Chris Pederick's Web Developer Toolbar = search for Web Developer ToolBar Firebug (the best one and must have) = search for Firebug Fasterfox = search for fasterfox IE tab = search for IEtab Html validator = ditto SEO Firefox = ditto XML developer toolbar = ditto Those are all really good, and I have them installed on my personal laptop and my work computer. -P
What CSSDevMonkey said is pretty much all you need. But do realise that installing lots of add-ons will take up more CPU usage.