The Green Web Firefox Add-on available on Mozilla for free

As of today a new Firefox Add-on is made available by Cleanbits, called The Green Web and hosted by Mozilla. The idea is that you're just doing what you're doing on the web, and in a small screen at the bottom of your browser we're checking the sites you visit on sustainability. Furthermore, it shows you who the green companies are that are hosting these sites.

Install directly or read more.