Powerful Color Tool For Firefox: ColorZilla

ColorZilla is an impressive Firefox plugin that assists web developers and graphic designers with color related tasks.

A built-in eyedopper can get the color of any pixel and a color-picker helps playing with colors instantly. Picked colors can be added to the plugin's palette viewer/editor.

Also, generated or sampled colors can be auto-copied in CSS RGB, Hex and other formats which is handy to paste them into image editing apps.

ColorZilla

A great feature is the ability to generate the color palette of any web page automatically and seeing where they are exactly used.

Beside these color-based functions, it can also measure between any to points

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