D2JSP User Block & Highlight is a Chrome extension designed to improve forum readability on d2jsp.org. It allows users to block or highlight posts, quotes, and topics from specific users, offering a tailored browsing experience. Users can add individuals by username, profile ID, or URL, and can even bulk-add multiple entries for convenience. The tool supports per-user and per-profile rules with customizable styles, ensuring a personalized interface.

The extension features persistent local storage, meaning that your rules remain intact even after browser restarts. It operates with a privacy-first approach, storing all data locally without tracking or sending information to external servers. Users can also export and import their settings in JSON format for backup or transfer, while an optional pop-out panel enhances usability with search and filter capabilities.