The study found that Firefox in its most secure configuration blocked 81.5 per cent of all phishing websites. Internet Explorer 7 blocked just 66.35 per cent of the phishing sites, according to the Mozilla study.
Firefox 2.0 failed to flag a phishing site in 117 instances when Internet Explorer 7 did catch it, while the Microsoft browser let 243 URLs slip through that Firefox stopped.
The test fed a series of known phishing URLs from PhishTank to the browsers over a period of two weeks in late October and early November.
A similar study carried out in September by Microsoft gave top marks to Internet Explorer 7. The study did not test Firefox 2.0 but compared the browser to seven third-party security applications.
The Microsoft study was performed by 3Sharp, a company specialising in messaging architectures that has no track record in market research and security analysis.
Mozilla's study results are available on the Mozilla Developer Center website.
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