Add-on page: [https://addons.mozilla.org/en-US/firefox/addon/color-tailor/](https://addons.mozilla.org/en-US/firefox/addon/color-tailor/)
Source code: [https://github.com/dguo/color-tailor](https://github.com/dguo/color-tailor)
Screenshot:
https://preview.redd.it/h6pcgc9zg7v11.png?width=2560&format=png&auto=webp&s=ee5cf5cd5fd96e94a287d71614275999a83be0fc
Nice, will try it and give feedback.