Excelente, tambien te da la facilidad de crear tu propio tema y subirlo a las Add-ons Store.

Apparently, this extension only opens color.firefox.com, which is the page which allows users to use some minimal online tools to stylize Firefox. There are no settings for the extension itself, nor is there a local tool within the browser. Unlike many other extensions, it does not extend settings within the browser, add options unavailable to Firefox, or make browsing the web easier.

Super cool

It has improved a lot, and the themes are saved on the Firefox Cloud; and now since the list of plugins are also saved on the Firefox account I have installed Firefox Color add-on, so now I'll be able to edit better in every reinstall of Firefox. Version 93.b1 is good