As users spend more of their computing time in the highly interconnected world of the Internet, their software and data are exposed to attackers at an increasing rate. Web browser developers are pursuing features to mitigate this exposure, but these mechanisms are primarily restricted to the browser itself. Google Chrome OS is an open source, lightweight operating system built for simplicity, speed, and security for Web-focused users. Its security functionality extends beyond the benefits of the browser, Google Chrome, to the core operating system environment. This talk will explore the design and implementation of that functionality and the challenges that lie ahead.\r