Rated 5 out of 5 stars

yazan: Alan B tarih: Eki. 23, 2018 ·

The update does work, thank you Jonathan Protzenko!
I found you had to download v1.2.0pre3 and install manually using Tools → Add-ons → Extensions then Install Add-on From File which is under the Setting Icon.
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).