The bedrock of security in Internet Explorer 8 is its consistent use of Windows permissions to limit what webpages and add-ons can do. This security fence around the browser window is called Protected Mode. In the following sections, among other things, we explain how Protected Mode defangs potentially dangerous add-ons by restricting their access to system files and redirecting files they save or create to locked-down virtualized locations. We also explain how Internet Explorer's use of security zones lets you apply different levels of security to different categories of sites .
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