Mozilla is divided into several separate support/service areas. What are you trying to access?

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Trying to login to sync Firefox account and password.

Resetting the sync password, or changing its e-mail, will remove all data from the servers.

This is a security feature. https://support.mozilla.org/en-US/kb/ive-lost-my-firefox-sync-account-information

• I've lost my Firefox Sync account information - What to do
• I’ve forgotten, or don't have access to, my Firefox Account email address

FredMcD said

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Hi folks, I understand that you are trying to access a Firefox Sync account that was created with an email that no longer exists. This one is tricky. You must have access to the email account in order to access the reset process.

I am sorry we cannot help. The best next steps will be to remove the account from the current profile, then create a new account with an email you do have access to, then sync the devices that were previously attached to the account.

Since Sync is not a back up service, all of the profiles that are on the locale devices will be synced on the new account.

Also, when you do create a new account with a working email, add as second one to it for back up. Add Secondary Email Address to Firefox Accounts.