The MoCo/MoFo split happened for a reason: a non-profit couldn't do the big commercial deals that became available to MoCo.
If you went back to the pre-2005 situation, in which MoFo was all there was, it would have at most low single-digit millions in the bank rather than a billion. The AOL dowry was only intended to last a couple of years, and there's simply no way it could have sustained development of the browser beyond that. The Phoenix would have been consumed by the flames, and we'd be left with a stagnant IE/Chrome duopoly.
On the linked report above I'm seeing software development as about 52% of their expenses. And many of the other expenses, eg "General and administrative", I understand to be support infrastructure for software development. This would seem to fit the meaning of "most" on my read.
Saying "Mozilla doesn’t itemize expenses" is like saying a university's annual financial report is hiding cafeteria costs because it doesn’t list fruit cups separately.
Large nonprofits publish consolidated, high-level statements that group expenses by broad function, not by department or line item because that's the correct level of financial reporting for external audiences.
If they misrepresented their spending that would be flagged by the independent auditor. It's deeply responsible to accuse them of hiding something when you have no baseline concept of standard disclosures.
>we'd actually benefit more from refocusing it into software (like it used to be).
Firefox was spending $40MM on software and development in 2009. Adjusted for inflation that would be ~ $60MM today. They're spending upwards of $262MM today. So they're spending more than quadruple what they used, to directly on software + development.
And that's the stated purpose. The observed current purpose of the system is to make a small handful of people more rich.