Pretty easy to slam out a patch when there is no corporate application dependencies on it. Or if there is, they won't complain and just fix their apps.
MS slams out a patch that breaks a singel app and they will get roasted to high heaven.
MS moves on a slow, known schedule to be sure they can get testing done and large deployments (corps, gov't, schools) can plan deployment schedules and not just be patching willy-nilly all the time.
If Firefox became a large corp/gov't dependency, they would have to do the same thing.
(And I am just going to ignore the fallacial nature of the title and content... Can't anyone report news without slamming in some red-herring or straw man? .. Oh. Nevermind, checked source.)