Kind of wondering what you’re talking about here? Firefox still works great for me, did I miss something in the news? Is there some sort of big change coming down the pipeline?
Not OP, but Firefox didn't have to lose nearly all its market share to Chrome. Mozilla could have course corrected and righted the ship, but instead they got distracted on dozens of unrelated and often controversial projects and ended up burning most of their credibility.
Mozilla is a husk of what it could have been, and that's hurt Firefox.
What, specifically, should they have done differently that would have made Firefox not lose most of its market share to Chrome, and how do you know it would have worked?
Keep Firefox in focus instead of losing sight of the browser and getting distracted on a million side projects, most of which had only a tangential relationship to the internet. Raise money to support the browser rather than to support politically divisive causes of the month.
I can't say for sure it would have worked, but I know that what Mozilla actually did do was actively counterproductive.
Mozilla is a husk of what it could have been, and that's hurt Firefox.