And the last time I checked, I paid for my OS.
Now then, you are prepared to assert that the people at Mozilla do what they do because they're charitable and live off trust funds?
As far as functionality to the end user, the paid browser is about as bad as browsers get, though it has been improving.
Mozilla is a non-profit, and what money they do make is pretty much from google search results, which include ads. They have a staff of about 50 people, and their source code is open. They also sell t-shirts and other gear. It works for them. They provide a free product that millions of people like to use. What’s so horrible about that?