Do you still have a device or computer that has a working Sync set up? You can find the sync account password and the sync (recovery) key in the password manager on computers where a sync account with a specific e-mail address has been set up. Look for: * chrome://weave (Mozilla Services Password) * chrome://weave (Mozilla Services Encryption Passphrase) You can look at this version of the about:synckey extension, modified by me, to show the sync key in current Firefox versions (desktop and mobile). * http://www.freefilehosting.net/aboutsynckey-11-fnfx You can download this Firefox extension file by clicking the "Download This File" button without having to register and sign on to this website.