Excluding Netflix as it's irrelevant technology-wise and including Microsoft, the difference is that those companies are offering a wide array of core products (operating systems, developer tools, server hosting, smartphones, etc) which most people on earth consume. They make a lot of money and continue to do so.

On the other hand what is Mozilla offering? A (now) obscure web browser that has run an Google charity for decades. It's painfully obvious that Mozilla isn't playing in the same category.