It's not clear to me what exactly you expect to Sync. Container settings (names, colors, icons, assignments) should be synced (if not, please file a bug). Open

It's not clear to me what exactly you expect to Sync. Container settings (names, colors, icons, assignments) should be synced (if not, please file a bug). Open tabs will be synced, not sure how they will open on another machine (considering URL-to-Container assignments should be synced, they should open in the respective containers – maybe there's a possible improvement here). I expect the different Cookie stores to be synced as well, if not, that's a bug.