FF is fantastic, but the uncomfortable question is, will it always be, given Mozilla has to found further development and is financed by Google's money as well? Apple's Safari actually has better standing in terms of alignment of user and developer incentives.
For a sustainable web (what's left of it anyway), it would be more helpful to radically simplify the web such that developers have reasonable and feasible specs to work against, and have diversity in browsers once again. Meanwhile, Google is working hard to lead audiences elsewhere via AMP, a Trojan made possible by JavaScript in the first place.