blank Thunderbird message box at the bottom of my screen
an annoying blank message box appears at the bottom of my screen and will not go away. If I click on it - it opens another Thunderbird window
an annoying blank message box appears at the bottom of my screen and will not go away.
If I click on it - it opens another Thunderbird window
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Does problem go away if you start Thunderbird in safe mode?
https://support.mozilla.org/en-US/kb/safe-mode-thunderbird