Can't sign in due to email change. Now what?
I am trying to sign in to change old email to new one but, an email is sent to the old address so, I cannot get in to change it.
Solution choisie
You will have to create a new account that you can access to be able to respond to the confirmation mail.
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Go to your user profile for that website and change the e-mail.
However, if you are talking about sync;
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
Solution choisie
You will have to create a new account that you can access to be able to respond to the confirmation mail.