The thing that scares me about this change is that it seems like the only reason they are doing it is "we’ve had many requests to take features to market sooner.". Where as the rest of the blog entry is to assuage our fears and otherwise placate everyone that things won't explode.

I don't know if 4 weeks is or isn't the right answer (after all some SaaS companies update dozens of times a day), but I know that I tend to leave my browser windows open until it crashes or the computer reboots. While I don't regularly use Firefox right now, I can imagine that I could skip entire versions with this behavior.