Working fine with Firefox on macOS and Android. You can even setup the authentication server, but I didn't see why I'd need that. Having the data on my own server is enough for me.
Re:Choose Firefox Now, Or Later You Won't Get A Choice (2014)
by Yetanfou on Friday January 06, 2017 @11:21AM
(#13337503)
It is still possible to hack 'old' sync accounts into nightly builds but this will soon disappear as well. The Android version does not support 'old' sync accounts any more.
https://docs.services.mozilla.com/howtos/run-sync-1.5.html
Working fine with Firefox on macOS and Android. You can even setup the authentication server, but I didn't see why I'd need that. Having the data on my own server is enough for me.