According to an Internetnews.com article this morning a study released today by security vendor Cenzic Firefox accounts for 44% of all browser vulnerabilities for January through June 2009. Safari (Apple) is second at 35% and Internet Explorer (Microsoft) is third at 15%. If you follow the space this will not come as a surprise. My advice would not be to recommend changing back to Internet Explorer if you use Firefox or Safari and like it. The advice would be to minimize the add-ons you use and always run the updater when prompted to do so.
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RT @msolncal Firefox and Safari More Vulnerable than Internet Explorer Q1-Q2 2009 – Managed Solutions http://bit.ly/235chv