All the more reason to keep using Firefox.

Donate if you can!

https://www.mozillafoundation.org/en/donate/

Donations to Mozilla Foundation do not support Firefox development. But payments for services to Mozilla Corporation do.[1]

[1] https://www.mozilla.org/en-US/products/

Those also don't go to just Firefox development but also to cushy executive salaries.

Last I heard was that there is no way to be sure that donations to the Mozilla Foundation go to Firefox.