- Firefox Monitor reaches more people to minimise the adverse effects of data leaks, and helps internet users to prevent them in the future. Potential further integration with Firefox will help make this usable by more people.
- Firefox Lockwise likewise can help getting the benefits of password managers to more people.
- Firefox Send offers a quick and private way to send some files.
They all also get people into the "Firefox ecosystem", reinforcing each other and giving Mozilla more leverage to help people be part of an open and accessible internet.
In the end, all they need to do is remain solvent while doing so - not make money. So far, their search engine deal is sufficient for that. Hopefully they'll find more ways to diversify their income streams, but that should never be the the sole criterium of whether or not to run a service or produce a product.