Note: Rainbow is no longer being updated, and will only work with Firefox versions <= 50.0. See Colorzilla as a replacement: https://addons.mozilla.org/en-US/firefox/addon/colorzilla/ Analyzer - Extracts the color scheme from the current website's images and CSS. Picker - HSV color picker. Inspector - Retrieves the color of any pixel on the browser. Copy color on click. Save color on right click.