At the top of the Firefox window, click the Firefox button and select Set Up Sync. The Firefox Sync Setup window will open.
   Click I Have an Account.
   Since you're not near the device with Sync already set up, click the I don't have the device with me link.
   Sign in to your Sync account:
       Enter your account email address
       Enter your password
       Enter your Recovery Key
       Then click Next 
   You will see a Setup Complete screen. Click Finish to complete adding this device to your Sync account.

I have Firefox Sync on my main laptop (COMP1) and I added my iPhone (DEVICE1). This setup works fine. I now have a new laptop (COMP2) and plan to retire COMP1. What is the best approach to recreating my connection for COMP2 and DEVICE1? I tried using this method, but don't think this will work once I wipe COMP1 clean: https://support.mozilla.org/en-US/kb/how-do-i-set-up-firefox-sync?redirectlocale=en-US&redirectslug=share-bookmarks-tabs-and-more-your-other-computers#w_get-the-code-on-another-computer Steps followed: Connect another computer to Firefox Sync Do these steps on the second computer that you are trying to add to Firefox Sync. At the top of the Firefox window, click the Firefox button and select Set Up Sync. The Firefox Sync Setup window will open. Click I Have an Account. Since you're not near the device with Sync already set up, click the I don't have the device with me link. Sign in to your Sync account: Enter your account email address Enter your password Enter your Recovery Key Then click Next You will see a Setup Complete screen. Click Finish to complete adding this device to your Sync account.