Depending on how far those Firefox forks have deviated, self-hosting the Firefox sync services has been a thing for quite a long time: https://github.com/mozill

Depending on how far those Firefox forks have deviated, self-hosting the Firefox sync services has been a thing for quite a long time: https://github.com/mozilla/fxa https://github.com/mozilla/fxa and https://mozilla-services.readthedocs.io/en/latest/howtos/run-sync-1.5.html https://mozilla-services.readthedocs.io/en/latest/howtos/run...