Hi If you check on your second device that you are using Sync to copy your data to, you should see the information that you wish to copy appear in Firefox. For example, if you have included Bookmarks in Sync on your desktop, you should (after logging into Sync using the same user name and password) see the bookmarks appear on your mobile device or second desktop copy of Firefox. I hope this helps, but if not, please come back here and we can look into a different solution for you.