The problem I (and others that I see here) have is the lack of trust in mozilla's model, esp long term. Their economic reliance in google, their repeatedly stated goals of trying to engineer ad-delivery systems that "respect privacy", their very high CEO salaries, and their random ventures do not inspire much trust, confidence and alignment in their goals. And also the unclear relationships with their for and non-profit parts.

If they can convince me that some subscription for firefox will strictly go for firefox development, that firefox will not pivot to ads (privacy respecting or not), and all the other stuff they have, including executives' salaries and whatnot, are completely separated, I would be more than happy to subscribe.