Sure, but even the most ‘normie’ of my friends have heard of FFox. I think it’s fair to say it’s pretty mainstream even if its not widely adopted. You’re right that they do claim to be privacy respecting and I think they are when compared to the immediate competition. It’s a matter of degree. Are they more private than Chrome? Yes. And that’s a step in the right direction whilst at the same time people like you and I know they could do a lot more.