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Everything merges... changes have timestamps, and they're just merged in time order which produces the output of the sync. It's extremely hard to fuck it up... worst I've seen in a decade of using it is occasionally duplicating a bookmark. Actually, not true... worst is adding a new computer and vanilla install of Firefox to the sync group and getting the default menu items back. But in the big scheme of things... both happen so seldom it's fine.
Velocio
So, if I sign up and sync I presume I'll need to pick a primary browser or something? Need to workout how to consolidate my laptop tabs.
EDIT: https://www.wikihow.com/Use-Firefox-Sync
In case of multiple devices with Firefox, which one is the master?
Community Answer
No device is master. All links from all devices are added together. The identical links are merged, others are added.