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Rainbow Color Tools 1.6.1-signed.1-signed Requires Restart
This addon is no longer being updated and won't work with new versions of Firefox. See the Colorzilla addon for a replacement: https://addons.mozilla.org/en-US/firefox/addon/colorzilla/.
Color tools for web development.
About this Add-on
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.
Library - Filter through saved colors by tag or the url of the page the color was found on. Sort by hue, date saved, and other metrics.
Colors can be tried out on websites by dragging a color area from the picker or library to webpage content, or by selecting an element to paint with the color picker. Color values can be viewed in hex, rgb, and hsl CSS formats.