DOM XSS Highlighter — Pro is a Chrome extension designed to assist developers and security testers in identifying user-controlled reflections within a webpage's DOM. This tool highlights URL parameters, hash fragments, and other inputs that may pose security risks, making it an essential resource during the development and quality assurance phases. The extension operates on-demand, allowing users to initiate scans only when needed, ensuring a streamlined testing process.

Key features include the ability to highlight user input across various contexts such as text, HTML, attributes, and scripts. Users can quickly rescan or clear highlighted inputs, enhancing the efficiency of the testing workflow. Additionally, it provides a structured JSON report for easy analysis. The DOM XSS Highlighter ensures that all data remains local to the user's browser, reinforcing user privacy and security.