Hey I am not saying people weren't perfectly in line to ask about this and raise the point/push for only releasing at feature parity. That's not what I recall the tone was though, heck even in this thread people are claiming that Mozilla wanted to eliminate extensions altogether. Mozilla employees also responded to these HN threads straight away clarifying that extensions were being looked at closely with intent (albeit no commitment) to have feature parity at launch.

As I said, given the history they should have had a clear communication of what they intend to do about extensions when they premiered Firefox Preview. Of course that also implies that they would have had to have a clear idea of what they are going to do about them at the time.