A Thunderbird add-on called "Disable DragAndDrop" stops folder movement by disabling drag and drop functionality.
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Our system has scanned the download for viruses, and we suggest that you also check the files before installation. The version of Disable DragAndDrop for Thunderbird you are about to download is 1.0.1, and the download will be provided as is, with no modifications or changes made on our end.