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A paradigm shift has been taking place in the personal computer sharing model: a computer is no longer shared by users, but shared by mutually distrusting applications or other content. This multi-application sharing model is mismatched with today's multi-user operating systems like Windows and Linux, which offer protection only across users. This mismatch contributes significantly to today's malware problem: a user is often tricked to download and install malware which runs with the privileges of the user or even with escalated privileges to harm the user's machine. Web-centric computing is another significant trend in computing, which makes web browsers a dominant client application platform.
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