Mozilla Foundation's 2024 revenue was 60% investments, 28% program service revenue, 11% contributions and grants.[1]
Most of program service revenue was from Mozilla Corporation. They paid Mozilla Foundation a small part of their revenue for trademark licenses, legal services, and so. And most of Mozilla Corporation's revenue was from Google.
Although I haven't looked at the actual reports in a long time, I think that's consistent with my understanding. The Google money (program service revenue) was a much higher percent in the past, creating the $1.4B nest egg. Now the Google money is greatly reduced and the majority of the income is from the nest egg.
I intended the percentages to support your point donations were little of Mozilla Foundation's revenue. But you missed Mozilla Corporation held most assets.
Most of program service revenue was from Mozilla Corporation. They paid Mozilla Foundation a small part of their revenue for trademark licenses, legal services, and so. And most of Mozilla Corporation's revenue was from Google.
[1] https://stateof.mozilla.org/pdf/Mozilla%20Foundation_Form_99...