Mozilla really needs to find ways to generate profits and in turn, channel the lion's share of those profits into their browser. But this is a hard proposition when giant corporations give away their browsers for free and even bundle it hard with their operating systems. The unfairness of Mozilla's browser endeavour is stark when you stop to think about it.
Maybe we the collective really do deserve our corporate overlords because we can't be bothered to pay for something when a free version also exists. This not only applies to Firefox but is a big reason why nearly all the top OSS are struggling to reach parity with their commercial counterparts.
How many of us will pay Office/Adobe licenses but if LibreOffice or Gimp ask for payment, we won't? The reason is vendor lock-in and feature-wise inferiority of the open source counterparts, but if no one uses them, then like the proverbial chicken-and-egg, they will never be able to compete, and will only slowly fade away.