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Tell Mozilla: It’s time to ditch Google
(mozillapetition.com)
A place to discuss the news and latest developments on the open-source browser Firefox
Mozilla today also has that base, but it still has about 1000 employees IIRC. It also pays more than $100k, even for EU devs, and of course also has to pay taxes and what not on top of that. And don't forget the infrastructure, for running builds, distributing the software, running Firefox Sync, etc., which does not come cheap.
750 employees, but the point stands.