Hi!
I wanted to know more about how Mozilla is funded. I know that there are differences between the Foundation and the Mozilla Corporation, but could you advise me where I should look to understand it better?
The public records will be the most direct source of information about Mozilla financials.
https://foundation.mozilla.org/en/who-we-are/public-records/
The audited financial statements will have specific details, in a form similar to the annual statements from publicly traded corporations:
You are probably looking for revenues. Look for values in the consolidated statements, and explanations later in the document.