Which browser is the most secure?

Recently, NSS Labs, a US-based testing company has performed a comparative review of several Internet browsers in order to determine which one provides the best protection against socially engineered malware.

Interestingly, the results seem to indicate that Internet Explorer 9 provides the best protection rates of all the tested products (which included Firefox 4 and Chrome 12)

Several people have questioned the validity of these reports based on the fact that older versions of IE are known to have been ridden with bugs and generally prove to be a security nightmare for any system administrator.

So, what is the truth here?

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