I don't mind side-projects, I mind that Mozilla looks completely directionless from the outside. It might even look like a Google-funded adult daycare. I can't trust that.
According to their latest financial transparency report[1], software development as a line item is about 60% of their expenses. However, your question wasn't about where revenue has gone, it was about where new donations would go. That lead me to the donation FAQ which reads:
> At Mozilla, our mission is to keep the Internet healthy, open, and accessible for all. The Mozilla Foundation programs are supported by grassroots donations and grants. Our grassroots donations, from supporters like you, are our most flexible source of funding. These funds directly support advocacy campaigns (i.e. asking big tech companies to protect your privacy), research and publications like the *Privacy Not Included buyer's guide and Internet Health Report, and covers a portion of our annual MozFest gathering.
If I'm reading this correctly, this means you are not able to donate to Firefox development at all. This explains the lack of Firefox on their website. Any mention of it as a product of the foundation would be misleading about where the donations go. From the point of view of the Mozilla Foundation, Firefox is just another revenue stream for outreach efforts.
This really bums me out, because I'm a huge fan of Firefox. It's my go to browser on my computer and my phone. I advocate for it as much as possible. I've donated before, but I've likely never actually financially supported development of Firefox. I support the EFF, so it's possible I could have donated to this foundation on its own merits. But I didn't.
[1]: https://assets.mozilla.net/annualreport/2024/mozilla-fdn-202...
[2]: https://www.mozillafoundation.org/en/donate/help/#frequently...
Yes, this is what so many people here on HN have complained about for years :) and is also being raised by the OP:
> To be clear, I very much support the Foundation, and it does amazing work, but I want to know this money in particular would directly support Firefox development.