I don't remember my password for Thunderbird. I'm getting a new laptop

If your old computer is still working, you count copy the profile from old to new. That may work, depending on the account and authentication of the account.. https://kb.mozillazine.org/Moving_your_profile_folder_-_Thunderbird Otherwise, you will need to contact your email provider. OR, on old computer, click settings>privacy&security, cick savedpasswords and then showpasswords