The question is how often. Adopting the firefox 2/3 model (albeit less nagging a-la-chrome) is a great step forward from the IE6 one we have had up to now, but they really need to match the rapid release schedules of mozilla and google today. At a minimum quarterly updates (features/engine updates, not just security fixes) to stop hindering the web.
Less naggy? I find Firefox to be one of the most naggy browsers about upgrades. Or have they changed this recently? With Chrome you just see a notification on the settings menu, and a restart brings you up to the next version. I really hope IE adopts this model.
I'm pretty sure recent versions of Firefox (say, since the early teens) have had nagless updates.
I find myself having to manually check the About dialog for updates now, because they're about the only reason I ever restart my browser, and if I don't manually check occasionally I'd have no way of knowing an updated existed.
