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Not a good tool.
The UI is poor and confusing.
The results can sometimes overlay the page content makin impossible to find the problem.
It does not refresh/reassess the page when you navigate thru the websites.

Almost perfect. Sometimes it shows errors where there's not any

I think there might be a bug with contrast ratio of running text over a gradient-background where it will fail in the add-on but pass on wave.webaim.org

C x

I have always found the WAVE Accessibility Extension extraordinarily useful, but the most recent update to the extension is just OUTSTANDING! I love that the contrast tools are now fully interactive and that contrast problems are reported up-front. The redesign of the tool is an absolute home run!!! Kudos to the developers and thank you for all your hard work!