CO2estimeter is a free Chrome extension designed to help users estimate the carbon emissions associated with their web browsing activities. Utilizing the Sustainable Webdesign Model v4, it calculates emissions based on the data transferred when loading web pages. By analyzing the performance metrics via the browser's Performance API, it provides an estimate of the carbon footprint linked to digital activities.

This tool is particularly useful for environmentally-conscious users looking to understand the impact of their online behavior. The extension offers a straightforward interface, making it accessible for anyone interested in reducing their digital carbon footprint. For those interested in the technical details, further information and updates can be found on the extension's GitHub page.