I love Firefox, especially on Android so that I can use UBO. I am amazed that it doesn't have a larger install base! That out of the way, does anyone have info

I love Firefox, especially on Android so that I can use UBO. I am amazed that it doesn't have a larger install base! That out of the way, does anyone have info on where Mozilla spends it's money? Is it still mostly on non-firefox vanity projects, and execs?