yep, the respectful way all of these firefox additions that mozilla deems en vogue at the moment, is for them all the be opt in.
Firefox advertises themselves as user respecting but falls short frequently and that disconnect riles people more than being abused by google and chrome who we generally know don't care about respecting users at all (unless it's profitable)
Now I'd have to tell them: install Firefox, then go here and click this, go there and click that, etc.