You can't recover the password of a Firefox Account, if you do not remember password then you need to reset the password or use the recovery key in case you have generated this key. This is only possible if you have access to the email addresses. *https://support.mozilla.org/en-US/kb/ive-lost-my-firefox-sync-account-information *https://support.mozilla.org/en-US/kb/reset-your-firefox-account-password-recovery-keys See also: *https://support.mozilla.org/en-US/kb/how-do-i-delete-my-firefox-account