Explore a novel approach to combating Cross-Site Scripting (XSS) and similar web security threats in this conference talk from Hack in Paris. Delve into the use of ECMA Script 5 features to create a client-side Intrusion Detection/Prevention System (IDS/IPS) using JavaScript. Learn how to seal important DOM properties, preventing attackers from reading and modifying sensitive data in a tamper-resistant manner. Discover the potential future of XSS mitigation and eradication through the implementation of these techniques in modern browsers like Chrome 8 and Firefox 4. Gain insights into this lightweight yet effective method of enhancing web security without requiring special execution privileges.