I am using what I am guessing is a new version of sync because I am only using my email and a password to sign in in FF 29 on OS 10.9. That process sounds similar to before, but there is nowhere to enter a device code for other devices now. What am I missing here? It just acts like I would sign into another device and it would be done, similar to Chrome. I originally stopped using FF because my tabs would never sync properly across the 2 devices, but would like to come back to FF.