> This is not true, based on what I've read about it. Do you have personal experience with these orgs that suggests otherwise?

Yes, I work for MoCo.

> Regardless, nothing is stopping Foundation funds from being directed to Firefox development. If someone gave them, for example, $1M that could only be spent on Firefox, they could pay Corporation or an external consultancy to contribute to the open-source Firefox repositories.

I don't really understand the whole setup, but I believe tax law is what is stopping this. What you are describing would be fraud (or something like it; IANAL). Money flows MoCo->MoFo (via dividends). Paying MoCo for something directly or hiring consultants to provide value would be "private inurement" [1], a phrase which here means that lawyers like scary words. It is using tax-exempt money to enrich private individuals.

But the tl;dr is that the MoFo/MoCo split was created specifically so that money could flow MoCo->MoFo and not the other way around, in order for MoCo to do business-y stuff without jeopardizing MoFo's non-profit status. Nvidia's game where it pays companies to buy their chips would not fly in the non-profit sector.

> This is already happening, either through Foundation or Corporation. One of the biggest Servo contributors works for a FOSS consultancy.

Servo was split out from Mozilla during COVID, and sadly is now completely unaffiliated. It is in the Linux Foundation Europe now. (Igalia is great, though!)

[1] https://legalclarity.org/private-inurement-definition-exampl...