"Not only is the research ignoring the existence of client-side vulnerabilities, it’s methodology is fundamentally flawed taking into consideration the limited number of URLs the browsers are tested against, combined with lack of testing of the additional protection features offered by the competing browsers and the related security add-ons."

Plus this has nothing to do with any other area of performance. So two things you should have learned today:

1. Read the ENTIRE article

2. No one should be stupid enough to solely rely on their browser to do an anti-virus' job, and so that barely factors into browser quality