As "Washington Post" blogger Brian Krebs calculated, MS Internet Explorer was "unsafe" for 284 days in 2006. (And by "unsafe", he means "with known, yet unpatched, security holes"). That's more than 75% of the year.
In comparison, Mozilla Firefox experienced a single such period of 9 days total in the same time frame.
I really had no idea that the difference was so significant: I am stoked. (And I'm proud of the many hard-working Firefox contributors who do their best every day to make your browsing experience a safer). Good job!
(via BoingBoing)