Sync Bookmarks is not active

Martin Páleník 5 days ago in EverSync - FireFox • updated 5 days ago 1

The extensions says "Sync Bookmarks is not active" and there is a "Locked" button on Firefox 57 running on fully updated Fedora 27 Workstation. Syncing using the "Options" doesn't work as well, it says "Initializing 0/0". The extension works in Chrome. I am using the paid version.