Izax

Looks like it can be self-hosted. You should be able to install Docker and run it with the docker run command it shows (then go to localhost:8080). Here’s a link to it on GitHub: https://github.com/rystaf/mlmym

I’ll keep using Firefox until I’m dead or it’s dead!

Have you considered installing a custom ROM? That’s what I do especially if the phone is still totally functional. It looks like Lineage supports the 4A https://wiki.lineageos.org/devices/sunfish/