Editing css stuff must haves. I seriously cannot live without these fire fox extensions.
firefox extensions:
Web dev is just awesome Web Developer
Color It ColorZilla Extension for Firefox and Mozilla
Firebug ( debugging) FireBug - JoeHewitt.com
x-ray https://addons.mozilla.org/en-US/fir...cation=firefox
Takes an image of your page, great for rough draft, changing colors, layouts before you actually get to the real work.
Pearl Crescent Page Saver
IE:
Styling for ie sucks but this prog helps a bit
cssvista
Litmus Labs: CSSVista
Test your site on tons platforms and programs.
Test your web design in different browsers - Browsershots