They publish their audited financial statements online: http://www.mozilla.org/foundation/documents/ http://www.mozilla.org/foundation/documents/ http://stati

They publish their audited financial statements online: http://www.mozilla.org/foundation/documents/ http://www.mozilla.org/foundation/documents/ http://static.mozilla.com/moco/en-US/pdf/Mozilla%20Foundation%20and%20Subsidiaries%202010%20Audited%20Financial%20Statement.pdf http://static.mozilla.com/moco/en-US/pdf/Mozilla%20Foundatio... As of December 31, 2010, they have assets of $168MM, of which $35MM is in cash and $105MM in investments. In the 12 months they spent $62MM on software development, $10MM on branding and marketing, and $12MM on 'General and administrative'. There's more granular detail if you're interested.