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Although both IE7 and IE8 include a "sandbox" defense dubbed "Protected Mode," the feature works only when the browsers are run in Vista (IE7 and IE8) or Windows 7 (IE8). Google's Chrome Frame, however, prevents malicious code from escaping the browser -- and worming its way into, say, the operating system -- on Windows XP as well.

Yesterday, Microsoft warned users that they would double their security problems by using Chrome Frame, the plug-in that provides better JavaScript performance and adds support for HTML 5 to Microsoft's browser.

Chrome Frame lets IE utilize the Chrome browser's WebKit rendering engine, as well as its high-performance V8 JavaScript engine. The extra speed and HTML 5 support are necessary, said Google earlier this week, if IE users are to run advanced Web applications such as Google Wave, a collaboration and communications tool that Google launched in May.Google pitched the plug-in as a way to instantly improve the performance of the notoriously slow IE, and as a way for Web developers to support standards IE can't handle, including HTML 5. The Chrome Frame plug-in works with IE6, IE7 and IE8 on Windows XP and Windows Vista