Giving a fair value to this study (Score 1)

I won't try to defend Firefox, as they have had a decent number of issues, but guys, given where this info comes from, I give this study a total value of 59 cents. Has anybody used their products ;) ? I would love to see a similar study which takes the following two things into account: - Severity of vulnerabilities - Number of days (weeks or even months) before the vendor released a fix Rob.