Sorry to hear you lost your Sync keywords. Sync is designed to be secure. If you loose your credentials you need to reset and start again . [[I've lost my Firefox Sync account information - What to do]]

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. *Firefox/Tools > Options/Preferences > Security: Passwords: "Saved Passwords" > "Show Passwords" Look for: * chrome://weave (Mozilla Services Password) * chrome://weave (Mozilla Services Encryption Passphrase) You would need an older copy of the signons.sqlite file and the matching key3.db file if you do not have a backup of the Sync credentials. *http://kb.mozillazine.org/Profile_folder_-_Firefox ---- Firefox 29 and later have a new Sync version that use a Firefox account and only use the name and password and no longer use a separate Sync (recovery) key (the Sync key is automatically derived from the password of the Firefox account). *https://support.mozilla.org/kb/how-to-update-to-the-new-firefox-sync *https://wiki.mozilla.org/Identity/Firefox-Accounts