Rated 5 out of 5 stars

With options to disable the auto-sorting of bookmarks bar subfolders and the bookmarks menu root (so I can manually sort my unfiled bookmarks by the order in which I plan to tackle them), this would be a five-star add-on. I look forward to upgrading my rating in the future!

This review is for a previous version of the add-on (1.6). 

These options were added to version 2.0.2.