Mozilla has proven to be really bad stewards, and as long as they exist nobody is going to pick up firefox. They've had many years to wake and up correct the course but choose not to, so it may be time to die. If Mozilla disappeared, a new organization could pick it up and run with it. If it weren't so overloaded in tech already, I might even call it "Phoenix" as it arose from the ashes of Firefox.
I have very few complaints about Firefox as software. I only wish more people would use it. (That includes you, dear reader!) It is actually great, and if you've ever complained about AMP, WEI or anything like that, using a non-Google derived browser is one of the few things you can actually do to reduce Google's power here.
Firefox are up against the power of OS defaults and dirty tricks in an age where most people don't really know what a web browser is. But if you have any awareness or concern about the health of the open web, you are absolutely educated enough to use Firefox. Of course there will be the odd minor workflow thing to get used to. But Firefox is great. All you really need is the motivation to choose something other than the default.
Let Mozilla.org die.