If your question relates to Thunderbird Android, # Open the settings page. # Select your gmail account. # Press the 3 dot menu, top right on the page. # Press remove account. You'll receive desktop specific support on their forum linked below. https://support.mozilla.org/en-US/questions/thunderbird I'm not familiar with the desktop version, AI answer's as follows. Steps to remove an account Open Thunderbird and go to Account Settings: # Use the menu (≡) > Settings > Account Settings, or look under Tools/Edit > Account Settings depending on your version. # ​In the left pane, click the email account you want to remove (click the top line with the email address, not just its subfolders). # ​At the bottom of the Account Settings window, click Account Actions and choose Remove Account (or Delete in some versions). # ​In the confirmation dialog, choose whether to remove only the account settings or also delete message data stored on your computer, then click Remove/OK to confirm. # ​Close the dialog and restart Thunderbird if prompted or if the account list does not refresh immediately.