Windows Internet Explorer 9 - The SmartScreen Filter protection offered by Windows Internet Explorer 9 has two components: URL
Reputation, which is included in IE8 and Application Reputation, which is new to IE9. IE9 caught an
exceptional 92% of the live threats with SmartScreen URL reputation, and an additional 8% with
Application Reputation. IE9 with SmartScreen offers the best protection of any browser against
socially engineered malware. Protection against malware targeting European users matched our
broader findings from the Q3 2010 global test.
Windows Internet Explorer 8 caught 90% of the live threats, an exceptional score that also
matched our broader findings from the Q3 2010 global test.
Apple Safari 5 caught 13% of the live threats. Protection offered was near identical to that of
Chrome and Firefox.
Mozilla Firefox 4 caught 13% of the live threats, far fewer than Internet Explorer 8 or Internet
Explorer 9. Results were 6% less than the 19% protection rate observed in our Q3 2010 global test,
indicating either an overall drop in protection for Firefox or regional weakness in Europe.
Google Chrome 10 caught 13% of the live threats, considerably more than the 3% observed during
the Q3 2010 global test and a welcome improvement.
Opera 11 caught 5% of the live threats, providing a measurable amount protection against sociallyengineered malware for the first time.
NSS Labs Results - WEB BROWSER SECURITY
SOCIALLY-ENGINEERED MALWARE PROTECTION [PDF]