Did you contact the email provider of your issue?

Unfortunately, if you no longer have access to the email associated with your Firefox Account and don't have a secondary email address setup, you aren't able to login to your account. For security and privacy reasons, no one will be able to bypass this for you. You will simply have to create a new account under a new email address.

If you are concerned about data in your old account falling into the wrong hands, you can submit a password reset request on that account. Since you don't have access to the email address, you won't be able to actually reset the password, but requesting a new password automatically wipes your data from the Firefox Sync server.

Syrek said

I can not log in to an email that is assigned to my mozilla account.

Are you referring to a "Firefox Account" https://support.mozilla.org/en-US/kb/access-mozilla-services-firefox-account ? or to an account on a *.mozilla.org site.

Unfortunately the email provider did not answer yet.