Firefox doesn't have the developer tools that Chrome does so developers use Chrome to develop with meaning their websites work better in Chrome so Firefox is playing catch-up or just plain looks worse keeping adoption of Firefox lower. Mozilla solves the problem by killing development of developer tools insuring Firefox is an afterthought. Is there anyone in Mozilla management that has a technical bone in their body?
These are hard decisions. I wouldn't jump to the conclusion that management doesn't understand tech, they obviously do, it's Mozilla.