Latest Canary, Version 81.0.385.0, Fav Sync IS On!Cheers,Drew
For everybody it's different. it's not universal.for me it's been on since 3 weeks ago, for others it got turned on 2 weeks ago, and it goes on and on.
It's most likely still Off for lots of others until some time later.
@HotCakeX For me it has been enabled few days ago, but still doesn't work anymore :-(. Maybe I will have to start from scratch because my favs are totally desynced between devices and between Beta and Dev channel.