GreenBeam is a subscription-based browser extension designed for Firefox that focuses on promoting sustainability in web usage. It utilizes data from the GreenWebFoundation to inform users about the renewable energy status of the websites they visit. This tool helps users understand the environmental impact of their online activities by highlighting which sites operate on renewable energy sources, encouraging more eco-friendly internet practices.

In addition to its core functionality, GreenBeam provides insights into third-party sites called by the visited websites, further enhancing the user's awareness of the carbon footprint associated with their browsing habits. By making informed choices about the websites they engage with, users can contribute to reducing emissions from IT, aligning their online behavior with sustainability goals.