Hi, could you provide a little more context about where you see these email addresses? For example, when when you click into a form field, does Firefox shows multiple email address options?

Firefox has both a form memory feature AND a saved login feature. If the email addresses are paired with passwords, most likely they are saved logins. Let's start here:

For Mac/Linux/Windows: Password Manager - Remember, delete and edit logins and passwords in Firefox

For iPad/iPhone: Manage saved passwords in Firefox for iOS

For Android: Manage saved passwords in Firefox for Android

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