I'm not sure if I understand the problem but this article should help you: [[How do I sync Firefox between my desktop and mobile?]] If your computer is already set up you can start on the Part 2 but from what I read you had deactivated your computer so you should start in Part 1. Let me know if it helps, and if not, some additional context will be good. Specifically, what do you see when you click on the Sync Tab in preferences?