The ColorZilla is a Firefox extension where you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. The extension offers three ways to choose colors: Color Picker, Eyedropper, Palette Browser.
ColorZilla for Firefox:
With ColorZilla for Firefox you can get a color reading from any point in your browser, quickly adjust this color and paste it into another program. You can Zoom the page you are viewing and measure distances between any two points on the page. The built-in palette browser allows choosing colors from pre-defined color sets and saving the most used colors in custom palettes.
Ultimate CSS Gradient Generator:
The Ultimate CSS Gradient Generator which specify gradients using pure CSS without having to create any images and use them as repeating backgrounds for gradient effects. It is powerful photoshop-like interface with 135 gradient and have horizontal, vertical, diagonal and radial gradients.It helps in import gradient from images and from existing CSS and you can adjust gradient by hue, saturation, lightness