Pixiv User Filter is a free Firefox addon designed to enhance user experience on the Pixiv platform by providing robust tools for managing artwork visibility. Users can create a blacklist to exclude artworks from specific users in the Recommendations section and tag pages. The addon also includes a counter that indicates how many artworks have been hidden, ensuring users can track their filtering preferences effectively.

Additional features include the ability to restore original aspect ratios for thumbnails, limit the number of recommendations displayed, and a user-friendly interface for adding or removing users from the blacklist. Users can manage their blacklist via the Options page or directly from user profile links. The addon also allows for easy exporting of the blacklist for backup purposes, making it a convenient choice for those looking to personalize their Pixiv experience.