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thunderbird manually sort folders
mozilla thunderbird user guidethunderbird support
thunderbird install addon

This extension allows you to manually sort (order) your folders in the folder pane of Thunderbird or automatically sort them, but in a better way. I built WindowListner into the "Manually Sort Folders" add-on (actually @jobisoft did) and it's His Thunderbird 68 has no support for Experiments. You can use add-on Manually sort folders 1.1. EDIT: Now the link is: Manually sort folders 2.1.1 (TB ver 68+).