This article explains how to update your email password in Mozilla Thunderbird version 60 and later. It also includes instructions for changing your password in the Thunderbird Password Manager.
Thunderbird: How to Change Your Email Password
Here's how to update the password that Mozilla Thunderbird uses to log into your email account.
Change the password of your Gmail, Yahoo Mail, Windows Live Hotmail, or other email account.
Close Thunderbird and then reopen it.
