AT Toolkit is a Firefox extension designed to improve the AutoTrader browsing experience for users. It offers a variety of customizable features that allow users to filter search results more effectively and access additional vehicle information. Key functionalities include the ability to hide results from specific dealers, display the date listings were added, and reveal hidden details such as previous owners and MOT expiry dates. Users can toggle these features on or off according to their preferences, ensuring a tailored experience.

In addition to its filtering capabilities, AT Toolkit enhances listing visibility by showing essential details like dealer postcode and partial vehicle registration. This extension is particularly useful for those looking to gain more insight into vehicle histories without intrusive ads or tracking. As a subscription-based tool, it remains free of charge while promising continuous updates and improvements, making it a valuable asset for any AutoTrader user.