[Sir_Substance]

It was partly that, but they also dropped the ball on their core demographic.

Things like pushing mandatory updates via "experiments", shoving pocket in everyone's faces, killing XUL.

I can't remember what it was they did that was the final straw for me, it was at least 4 years ago and not even that big a thing. What I remember is going "well, there goes my last shred of hope. Mozilla officially doesn't understand why their core advocates prefer them over alternatives. Might as well move to vivaldi and at least get all them sweet chrome addons".

Mozilla forgot about their "whole-of-product quality". Their brand was "secure, private, power-user oriented". They've been slowly cutting bits off for years that impact those aspects, and somewhere along the line they passed a threshold were they weren't sufficiently more secure, sufficiently more private or sufficiently more power-user oriented than competitors. No one change was at fault, but they've diluted themselves too much now. They're no longer the staunch defender of non-corporate internet ideals they used to be, and without that, they sorta...don't matter.