Can't you login to Sync on that device using the email and password of this Sync account ?

• https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer
• https://support.mozilla.org/en-US/kb/how-do-i-choose-what-types-information-sync-firefox

Thanks for your reply. When you use the device Sign Out button you no longer get sync updates and I signed out my workstation on my laptop so do not get the workstation updates on the laptop. I want to reconnect the workstation but the add device only gives the opportunity to connect mobile devices. I suppose that the brute force method would be to delete the account completely on all devices and start again but I don't particularly want to do that.

You can always login manually by using the email address and password.

• https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer

To connect another desktop computer or profile, just sign in and let Firefox Sync do the rest. To sign in, you'll need the email address and password you used in the previous section.

• https://accounts.firefox.com/signin