Firefox has the "killer app" for modern browsers--ublock origin.

I am dismayed by how much money Mozilla spends on things other than the browser, though.

Except for the vast majority of normal people, uBlock Origin Lite is enough. And Blink alternatives like Brave or Vivaldi have them built-in while using the "preferred" engine, which is even more convient.

So, to them, Firefox is a worse performing browser with missing features that sometimes doesn't work for certain websites. There's no "killer app" to be seen.

Ad blocking should just be an integral browser feature at this point, as in Brave or Vivaldi.