Abstract Today web browsers have become the de facto platform for Internet users. This makes browsers the target of a lot of attacks. With the security considerations from the very beginning, Chrome offers more protection against exploits via benign-but-buggy extensions. However, more and more attacks have been launched via malicious extensions while there is no effective solution to defeat such malicious extensions. As user's sensitive information is often the target of such attacks, in this talk, I will discuss how to proactively defeat information leakage with our iObfus framework. A proto-type has been implemented and iObfus works seamlessly with the Chromium 25. Evaluation against malicious extensions shows the effectiveness of iObfus, while it only introduces trivial overhead to benign extensions. Speaker's Bio Wentao Chang is currently a PhD candidate in Computer Science at George Mason University. He received his B.S. degree (Hons.) in Computer Science and Technology from Nanjing University, China in 2006, M.S. degree in Computer Science from George Mason University in 2010. His research interests include web browsing security, malware analysis and mobile security.