Really the best way to edit many bookmarks in many folders as I often do (move, delete, create new structures ...). This works best in the NC / two panel view.
The programmer has created a powerful tool for users who want to create their own structures for many different topics with many links - here is the moving over two panels unbeatable. An extensive but chaotic collection of links after a surfing session can be arranged in the best possible way.

Wonderful for the future would be the possibility to change icons and font sizes - that would be good for the user. Multi- Select with the shift-key was not possible, but to collect single links with the control-key to mark them worked.

Conclusion for me: long and eagerly awaited tool, everything offline, no data-grabbing cloud, no restricting automatics. A little more fine-tuning and ready is a really cool tool.