Let us donate directly to Firefox development. That is the solution. You don't have to look anywhere else. Thunderbird is a good example of what can be done when the donations reach the project. I just hope they don't screw it up as well. I have zero belief in Mitchell Baker and the Mozilla leadership. And every decision they did to screw MDN and Rust among other things puts their competition in a better position.
Unfortunately, I am done pretending otherwise. I haven't seen anything that is indicative of otherwise. Especially after acquiring a behavioural ads company. I will believe when they make decisions that aligns with it. Not with marketing materials saying otherwise or cos of whatever Firefox fans are left is saying. I stuck through the Firefox abandoned phase until Quantum release even for work. It's not cool that Mozilla is doing this.