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Original web browsers were applications designed to view static web content. As web sites evolved into dynamic web applications that compose content from multiple web sites, browsers have become multi-principal operating environments with resources shared among mutually distrusting web site principals. Nevertheless, no existing browsers, including new architectures like IE 8, Google Chrome, and OP, have a multi-principal operating system construction that gives a browser-based OS the exclusive control to manage the protection of all system resources among web site principals. In this paper, the authors introduce Gazelle, a secure web browser constructed as a multi-principal OS. Gazelle's browser kernel is an operating system that exclusively manages resource protection and sharing across web site principals.
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