ToN tracker is a Firefox extension designed for users who appreciate detailed statistics and progress tracking in their gaming experience. With a subscription-based model, it offers a variety of features that cater to stats enthusiasts. Users can view their total progress in both numerical and percentage formats, excluding certain legacy terrors. The extension also includes a dedicated 'round progress' page that visually represents the percentage of terrors survived in each round using progress bars, enhancing user engagement and tracking capabilities.

In addition to these core functionalities, ToN tracker provides several quality-of-life toggles and additional counters for tracking survived and mastered terrors. Users can access a detailed stats page for round history, a mastery progress page, and options to track perfected rounds. The extension's content is accessible in Japanese, thanks to community collaboration, and it promises future enhancements that will integrate features into the main tracker, ensuring a visually appealing and efficient user experience.