Foot is a subscription-based extension for Firefox designed to improve search results on Google by adding extra relevant content directly related to user queries. This tool provides additional results that are not sourced from Google, making it easier for users to find specialized information. The results are clearly marked with a distinct section title and green URLs, allowing for quick identification of these supplementary sources.

Users have the option to remove these additional results by simply uninstalling the extension if they prefer the standard Google experience. Foot aims to provide a more comprehensive search experience without cluttering the interface, ensuring that users can access both sponsored and non-sponsored content relevant to their interests.