@aral half a billion, most of which comes from Google, right? Not donations. And they allow you to disable the ads in the search bar and donate, if you think it's a better model.
I don't get all the hate for that move. Mozilla is not perfect, I get it, and the CEO earns a lot, ok. But I see many people recommending LibreWolf, which is Firefox, which suggests that they don't hate the project, but just the optional ads. Still, do they donate?