If you can't access the primary email address, your only option is to create a new Mozilla Account with an email address you can confirm. *https://support.mozilla.org/en-US/kb/ive-lost-my-firefox-sync-account-information You can add a secondary email address and confirm this email address. Once this new email address has been confirmed, you can make the secondary email address your primary email address. *https://support.mozilla.org/en-US/kb/change-primary-email-address-firefox-accounts *https://support.mozilla.org/en-US/kb/add-secondary-email-address-firefox-accounts