I agree generally with your points, but this doesn't really address the issues being criticised in comments here. I want to use Firefox (I do currently use Firefox, despite a lot of limitations), but there comes a tipping point where the balance of privacy (and apparent "user-interest") and actual usability and power leads to a not-so-good proposition.
Someone has commented above that it seems like Mozilla management may have been bought off by competitors and may be deliberately trying to run Firefox into the ground. I don't believe this, but given the recent decision-making it's not entirely implausible.
Opera went a similar path ~5 years ago. Most Mozillans don't consider this comparable as Opera was closed-source (and there's this one-track tunnel vision people have around that term), but the similarities are stark. A company with a history of listening to its users and a massive level of contribution to open standards and interoperability, making a product that served a niche userbase extremely well, decided that aping it's mainstream competitor (Chrome) directly would somehow be a good move. Now there's no discernible difference between Opera and Chrome, and no reason whatsoever to choose the former over the latter.