So there are 2 Mozillas: There's the Mozilla Foundation, and the Mozilla Corporation. The corporation develops Firefox. The foundation takes donations. For reasons I don't claim to understand (IANAL, and I gather there's tax law stuff involved), the foundation apparently can't give the corporation money to work on the browser. This leads to a regular point of confusion and a complaint because people would very much like to financially support the browser, but there is literally no way to donate to it. Now I believe (again, IANAL) that there are ways they could arrange things so that people could give money to the corporation for the browser, but they have not done those things. A person could plausibly argue that that's because Mozilla Foundation wants people to donate to the foundation and not the browser, though I'm not sure if they've ever publicly said anything explicitly. (If they have, I would very much appreciate links.)