I've been donating money to Mozilla hoping to support Firefox, but a recent posting on HN made me doubt it. So I asked Mozilla Foundation if any of my money goes to Firefox. Here is the answer:
> Thank you for being a Mozilla supporter.
> Donations to Mozilla support the work of the Mozilla Foundation, as described on our website here: https://foundation.mozilla.org/.
> Donations to Mozilla do not support the Firefox browser; instead, their development efforts are funded by revenue generated within the product itself, primarily partnerships with search engine companies.