Explore the challenges of creating software that balances usability and security in this 21-minute conference talk from USENIX Enigma 2016. Gain insights from Adrienne Porter Felt, Staff Software Engineer at Google Chrome, as she shares firsthand experiences from the Chrome security team's efforts to redesign the browser's security UI. Discover the limitations encountered when applying common usable security practices to a browser with over a billion users. Learn about real-world constraints, priorities, and practical solutions that have proven effective for Chrome and may benefit other practitioners in the field of usable security.