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About this Add-on
Also, switch temporarily to the “All Folders” view when you hover over the folder view title (i.e., the title to the left of the arrow buttons) for several seconds during a message drag & drop operation, and switch back automatically after the drop.
In the add-on preferences, you can set the delay before the view is switched.
The remaining functionality of the add-on, i.e., automatically switching to the "All Folders" view when you over over the toolbar while dragging a message, remains in effect in Thunderbird 48+.
On older versions of Thunderbird, the view-switching arrows functionality is retained.