Firefox, add-on update when starting, how to change that?

Firefox, add-on update when starting, how to change that?

I found very annoying that when opening Firefox (3.5) all extension popup for update. Is there a way to have not this popup right from the start. When I start a browser is often because I have task to do right now with it... It would be better if it would not act like a nag screen. Is there a way to customize this update screen?