WCAG ColorChecker is a Firefox plugin that enables you to test the colors of a web page for easy readability with regard to contrast and several Discromatopsia. It installs itself as a button in the lower left corner of the status bar. Clicking on the button opens a side panel. You can select elements or colors on the page using ColorZilla, and ColorChecker will show you its results using either a green check mark or a red cross next to the criteria.
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