Please provide the following information: '''1.''' A screenshot showing the error message you get. See: [https://mzl.la/2k8nWUE How do I create a screenshot of my problem?] '''2.''' The part of your e-mail address after the @ symbol. '''3.''' Your Thunderbird Troubleshooting Information. At the top right of the Thunderbird window, click the menu button (or use the regular menu at the top), then select Help: Troubleshooting Information. Click the "Copy text to clipboard" button.  Do not check the box "Include account names"  Then paste (Ctrl-V), the text into your response here. We only need to see the sections down to and including the "Extensions" section, so you can delete the rest.