26 characters has the recovery key see: [https://support.mozilla.org/en-US/kb/Replace%20your%20Sync%20information Replace your Sync information] see analytical informations: [https://support.mozilla.org/en-US/kb/what-firefox-sync What is Firefox Sync?] [https://support.mozilla.org/en-US/kb/how-do-i-set-up-firefox-sync How do I set up Firefox Sync?] [https://support.mozilla.org/en-US/kb/How%20to%20sync%20Firefox%20settings%20between%20computers How to sync Firefox settings between computers] [https://support.mozilla.org/en-US/kb/how-do-i-manage-my-firefox-sync-account How do I manage my Firefox Sync account?] thank you Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

There are two keys.<br /> One is the 26 character Sync key that is used to encrypt your data before uploading.<br /> The other is the 12 character key that is used to setup another device more easily. If you want to use the Sync key then click the link at the bottom "I don't have the device with me"and enter all needed data manually. ---- *https://support.mozilla.org/kb/how-do-i-manage-my-firefox-sync-account *https://support.mozilla.org/kb/how-do-i-set-up-firefox-sync *https://support.mozilla.org/kb/add-a-device-to-firefox-sync