How to sync speeddial on FF 53?

How do I sync speeddial on FF 53?
I also use old speeddial 23
Both work fine and I don't want to upgrade, just want to sync
Maybe I can install some old eversync, for that? 
Dont need any new features, just want to sync and keep what I have now. Old, outdated, etc. versions are fine.
Any options?