But Firefox is a for profit company worth millions? Why would you just donate it like that to a corporation? For the longest time I thought Mozilla was a non profit org but it doesn’t seem to be the case and they have millions in the bank? I would sell it for a fair price for both parties.

Mozilla Corporation is a for-profit entity wholly owned by the Mozilla Foundation. That's why they can keep lots of cash on hand and reinvest it into the business.