The Tournesol Extension, developed by Tournesol Association, is a free add-on for the Chrome browser that aims to enhance your YouTube experience while also contributing to the Tournesol project. Tournesol is a participatory research project focused on the ethics of algorithms and recommender systems.

With the Tournesol Extension, you can now see Tournesol's recommendations directly on your YouTube home page, even if you don't have a Tournesol account. This allows you to discover new videos that align with Tournesol's ethical values and interests.

When connected to Tournesol, you have the opportunity to compare the videos you have recently watched. By doing so, you contribute to the research team's efforts in understanding the impact of algorithms and recommender systems on our online experiences.

Additionally, you can add videos to your rate-later list, making it easier to compare them at a later time. This feature allows you to curate a personalized list of videos for future analysis and comparison.