You can't recover a forgotten Primary Password, your only option might be having an earlier copy of key4.db from before you started using the PP or you are using Sync and have the logins on another device. You can only reset the PP what means that you lose all your logins, you may want to keep a backup copy of logins.json and key4.db. *https://support.mozilla.org/en-US/kb/reset-your-primary-password-if-youve-forgotten-it *https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data