Definitely true. Asking users to respect certain principles is tantamount to guilting them which doesn't work.
> It’s time we analyse what Firefox does better than Chrome, and sing those praises.
From the perspective of a non-technical user, the differences are not noticeable. Firefox and Chrome have continued to converge (...er...maybe one following the other) to the point that the differences listed are not real differentiators.
Oddly enough, you could argue that telemetry and the constant push for user happiness and adoption is what is hurting FF. FF looks like Chrome. I'm not saying stop listening to your users, but in general it's ok to differentiate yourself in ways that don't appear to be immediately beneficial to adoption. The primary way this can be done is in the UI. We can all recognize that there are still lots of efficiencies to be gained around the current state of internet navigation. Other approaches may not be better, and I understand the maintainability fear of multiple UI paradigms in the same software, but at least it's a way of differentiating yourself.