The Tournesol Extension for Firefox is a free tool designed to improve user interaction with YouTube by integrating ethical algorithm research directly into the viewing experience. This extension allows users to view Tournesol's recommendations on their YouTube homepage without needing an account. It encourages participation in research about algorithms and recommender systems, making it an engaging way to contribute to a larger cause.

Users can compare videos they have watched to aid the research team and can also create a rate-later list for future comparisons. Additionally, the extension supports importing YouTube history, enabling a more personalized and insightful experience. This tool is ideal for those interested in the ethical implications of algorithms and seeking to actively participate in collaborative research.