Rated 5 out of 5 stars

per Mr. Man-wai Chang el gen. 1, 2010 ·

There is now another tool that works side-by-side with FolderPane Tools. It's called Manually Sort Folders:
https://addons.mozilla.org/en-US/thunderbird/addon/15102

This review is for a previous version of the add-on (0.0.5.1).