Rated 5 out of 5 stars

per Megawatt el nov. 9, 2018 ·

Works well but not with Thunderbird 60.3.0 and version 1.1.1 of the add-on. This shows nothing in the accounts or folders panes. As others have said, download and install version 1.2.0pre3 which works fine.
https://github.com/Ximi1970/Manually-Sort-Folders/releases/download/v1.2.0pre3/manually_sort_folders-1.2.0pre3.xpi

This review is for a previous version of the add-on (1.1.1).