Explore the privacy implications of browser extensions in this 23-minute conference talk. Uncover potential information leakage risks associated with third-party code execution in users' browsers. Learn about the Mystique approach to taint tracking, including challenges and solutions like V8, Data Flow Graph (DFG), and control-flow dependencies. Examine real-world examples, estimate true positive rates, and understand the impact on affected users. Gain insights into popular extensions like SimilarWeb and Web of Trust. Discover the limitations of the research and the open-source availability of Mystique for further investigation.