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In reality, I doubt there’s much separation between Mozilla, the corporation, and Mozilla, the foundation, but there is a world of difference between how Mozilla presents itself to the open-source development community and the most community-friendly of open-source companies, like Red Hat. Mozilla Corporation is a wholly owned subsidiary of the Mozilla Foundation, and money always seems to take second place to community with Mozilla.
This makes Mozilla projects like Firefox a safe place for an open-source community to congregate, contribute, and win. For this reason, Microsoft and Google are going to struggle to compete with Firefox, because both have too much vested, corporate interest in steering the Web to their own parochial interests, whereas Mozilla can exist solely to make Firefox better for the world.