You might want to consider working either hourly or on a project basis as a contractor. You would have deliverables with deadlines you could meet them on your own time, or simply bill for the time you spend.

You can perhaps look into “midlance” where you have a middle man getting a cut who is responsible for lining up work for you (after which you manage the relationship with the client).

Maybe more common where I live but vacancies will sometimes mention “flexible hours” explicitly, especially remote jobs. Then you can ask them clarify in the interview what their prospective on flexibility looks like.

Did you ever find the missing packets?

That’s nice, I think I’ll switch from Firefox ESR on Debian!

You could package it and install with pipx