Hello willoughby.liley, To rename your device in Firefox Sync using Firefox Android, tap the "3-dot" button on the bottom right corner of the Firefox app, then tap "Settings". From there, tap your email account that is located under the "Account" section. You will be brought to the "Account settings" page. In this page, tap "Device name", change the existing device name to your desired device name, and tap "OK". The device name change will then instantly be reflected in your Firefox Account's Connected Service section. '''Note: You might also notice that the device name might revert back to the old one. ''' That is not an issue, just close the Firefox app after you are done with the device name change and reopen Firefox. Now, when you navigate back to the "Account settings" page, you will see that your device name change has been successfully reflected. Attached are screenshots of me personally trying the above instructions out, and they work as intended. Kindly mark this answer as the solution(solved) if it managed to help you! If it did not, kindly report back so I can help!