It's an open secret if you want to look around. For example: https://calpaterson.com/mozilla.html https://calpaterson.com/mozilla.html "Sadly Mozilla's annual

It's an open secret if you want to look around. For example: https://calpaterson.com/mozilla.html https://calpaterson.com/mozilla.html "Sadly Mozilla's annual report doesn't break down expenses on a per-project basis so it's impossible to know how much of the spending that is on Mozilla's programme is being spent on Firefox and how much is being spent on all these other side-projects. What you can at least infer is that the side-projects are expensive. Software development always is. Each of the projects named above (and all the other ones that were never announced or that I don't know about) will have required business analysts, designers, user researchers, developers, testers and all the other people you need in order to create a consumer web project. The biggest cost of course is the opportunity cost of just spending that money on other stuff - or nothing: it could have been invested to build an endowment. Now Mozilla is in the situation where apparently there isn't enough money left to fully fund Firefox development."