[Kejistan]

That doesn't seem feasible, most people (that I know) leave FF running all the time; or if they do close it the last thing they want is the application taking even longer to shut down because it wants to ask about running some updates. Think about the scene from Office Space.

Nagging people while they're trying to do stuff obviously isn't ideal either. So as just about everyone has mentioned: Chrome's silent updates are a big win for convenience. Because should the average user really have to think about keeping their software up to date?