Rated 5 out of 5 stars

First, Manually sort folders is awesome, work(ed) great and is critically needed. Thanks for this great addon!

2nd, currently, this addon is not working on TB115 because of continuing changes to Thunderbird. TB 115 added some account sorting, but not folder sorting.

3rd, they are discussing this issue on this addon's github page:
https://github.com/protz/Manually-Sort-Folders/issues/199

4th, if you support this incredible addon, I would suggest paying attention and be ready to participate in a campaign to convince Mozilla to support the Manually Sort Folders developers IF/WHEN they ask for it. Mozilla does listen...