I just got a Lenovo Yoga 3 Pro x86 Android tablet. I installed Firefox and configured Sync for my account that was already happily syncing between desktop and my Moto X Android phone. But on this tablet nothing is sync'd, not bookmarks and not logins, despite both being checked. What's really infuriating is Settings > Sync reports "Sync: enabled, Last synced: 17 minutes ago". It doesn't seem to realize it's utterly failing!