Hello, Here is a way to recover a lost Mozilla account : If you have a '''recovery key''', you can use it to recover your account. If not, you can find your old firefox data by going into this filepath (on windows) Main profile holder: '''C:\Users\<YourUsername>\AppData\Roaming\Mozilla\Firefox\Profiles\''' Other data storage: '''C:\Users\<YourUsername>\AppData\Local\Mozilla\Firefox\Profiles\'''