Explore the security implications of browser extensions in this 40-minute conference talk from AppSec EU 2017. Delve into the dual nature of extensions as both useful tools and potential security risks. Examine the current security model for browser extensions and its limitations in addressing user privacy concerns. Learn about the analysis of over 2500 browser extensions, their usage of security features, and examples of high-risk extensions. Understand the threat model from a user perspective and discuss potential improvements to enhance browser extension security. Gain insights into short-term recommendations and enterprise-level strategies for managing extension risks.