Firefox addons
for Firefox - Eyedropper, Color Picker and much more
ColorZilla for Firefox is an add-on that assists web developers and graphic designers with color related tasks - both basic and advanced. With ColorZilla you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. You can analyze the page and inspect a palette of its colors. The built-in palette browser allows choosing colors from pre-defined color sets and saving the most used colors in custom palettes.