A recent report identified Firefox users as most likely to be running the latest version of the browser at any point in time. Brian Krebs at the Washington Post comments on it here: Forty Percent of Web Users Surf With Unsafe Browsers
This is great news for Mozilla, since it demonstrates that the work that has gone into the auto update mechanism and the restore session feature has really paid off. In order to reduce the window of risk for users and minimize the time to deploy, we have put a lot of effort into making sure that it is as easy to install security updates as possible. This is not the first time we have heard this, but it is great to get more numbers behind what we already know: Firefox is safer because Mozilla continually works on security improvements, ships updates quickly, and makes it easier to stay up-to-date.
You will be hearing more about our effort to collect meaningful security metrics like these soon.
Asa has a few words to say about this on his blog.