Toxic is a free Chrome extension designed to track Instagram accounts privately. It allows users to monitor whom they follow, identify users who do not follow back, and gain insights into their Instagram interactions. The extension requires users to be logged into their Instagram account and functions optimally with the Instagram tab open in the browser.

Key features of Toxic include anonymous tracking, ensuring that no user is notified of monitoring activities. Users can export follower data as a CSV file for offline analysis, and the extension does not store any login credentials or require third-party access. Operating entirely within the local browser session, Toxic does not connect to external servers, ensuring user data remains private and secure. It supports accounts with any number of followers, although performance may vary with larger profiles.