That's the problem: Mozilla makes ~590 million, but the vast majority is not for engineers, but for:
https://foundation.mozilla.org/en/blog/women-in-ai-ethics-ex...
Not to mention firing a CEO with cancer, throwing a Party (Feminist, Decolonial, LGBTQIA+, Climate Justice using Al) in Zambia (no joke) after firing 1/3 of the staff and so on. Firefox/Mozilla is the best paid OSS project (apart from Linux), but spends most of the money on non-technical stuff (same with the Linux Foundation).
Mozilla.org/Mozilla is now a Ad-Company not a OSS-Project.