DOM XSS Highlighter — Pro: Detect and Highlight Risky DOM Reflections Instantly

Overview

DOM XSS Highlighter — Pro is a browser extension built for developers, security testers, and QA engineers who want to spot user-controlled reflections in a website’s DOM quickly and efficiently. It highlights URL parameters, hash fragments, and other inputs appearing in potentially dangerous contexts, helping identify DOM-based XSS vulnerabilities before they become a real security threat.

Unlike automated scanners that may miss subtle reflection points, DOM XSS Highlighter focuses on manual detection with precision, giving you full control over your testing workflow while keeping all data local—no information leaves your browser.

What is DOM-Based XSS and Why It Matters

DOM-based cross-site scripting (XSS) is a type of vulnerability that occurs when user input is reflected in a website’s Document Object Model (DOM) without proper sanitization. Attackers can exploit these reflections to inject malicious scripts, steal sensitive information, or manipulate a web application’s behavior.

Traditional XSS scanners sometimes fail to detect DOM-based XSS because it doesn’t always interact with the server. By highlighting user-controllable elements directly in the DOM, DOM XSS Highlighter enables testers to catch issues early during development or QA, improving overall web application security.

Key Features of DOM XSS Highlighter — Pro

• On-Demand Scanning: The extension runs only when triggered, giving testers full control and preventing unnecessary scanning of unrelated pages.
• Highlighting User Input: Detects user inputs in text content, HTML, attributes, and scripts, making risky reflections visible at a glance.
• Quick Controls: “Rescan” and “Clear” buttons allow rapid testing without refreshing pages or losing context.
• JSON Export: Click highlighted text to generate a structured report for documentation or further analysis.
• Local-Only Processing: Ensures privacy by keeping all scanning operations inside your browser.

How to Use DOM XSS Highlighter — Pro

1. Install the Extension: Add DOM XSS Highlighter to your browser from the official store.
2. Open the Target Page: Navigate to the website you own or have permission to test.
3. Activate Scanning: Click the extension icon to scan for user-controlled reflections.
4. Review Highlights: Look for highlighted elements in text, HTML, attributes, or scripts.
5. Export Reports: Click on highlighted reflections to save a structured JSON report for documentation or sharing.
6. Rescan or Clear: Adjust testing as needed using quick controls.

This workflow allows developers and testers to pinpoint risky areas in real-time without switching between multiple tools.

Google Chrome : https://chromewebstore.google.com/detail/dom-xss-highlighter-%E2%80%94-pro/dcmahamcnljjgnpmgdldjnblplmibapc

Mozilla Firefox: https://addons.mozilla.org/en-US/firefox/addon/dom-xss-highlighter-pro/

Benefits for Developers and Security Testers

• Accelerates Security Testing: Quickly identifies potential DOM XSS vulnerabilities without deep manual inspection.
• Improves Web Application Safety: Detecting reflection points early helps prevent security breaches in production.
• Professional, User-Friendly Interface: Designed for security teams, QA engineers, and developers alike.
• Privacy-First Testing: Local-only scanning ensures sensitive information never leaves your device.

Real-World Use Cases

• Development Phase: Developers can test new features for DOM XSS before pushing updates.
• Quality Assurance: QA engineers can verify that user input is sanitized and safe.
• Security Audits: Penetration testers can document and report DOM reflection risks efficiently.

Important Note

⚠️ For educational and authorized testing only. Use DOM XSS Highlighter strictly on websites you own or have explicit permission to test. Unauthorized testing is illegal and strongly discouraged.

Conclusion

DOM XSS Highlighter — Pro By 0x is an essential tool for anyone involved in web development or security testing. It streamlines DOM XSS detection, saves time during manual testing, and helps build safer, more secure web applications. With its local-only scanning, structured JSON reporting, and clear highlights, this extension is perfect for developers, QA engineers, and penetration testers alike.

Install DOM XSS Highlighter — Pro today and make DOM XSS testing faster, easier, and more effective!

Frequently Asked Questions (FAQ)