It would be easier to forgive if this was the first time Mozilla pulled this sort of thing. Instead, we see Mozilla making this same kind of mistake -- i.e. trying to turn what is otherwise a great browser into some kind of "platform" for things that do not actually serve users -- over and over again.
It's great that it was pulled, but what about removing the ability to silently install add-ons? Give up the power to make this mistake in the future if you want forgiveness.