Process From Here от Ted

This addon helps the user identify and process bookmark duplicates. It also handles empty folders.

Instead of processing all the user's bookmarks, it allows processing just a subset based on the folder selected. A new tab is opened where all processing is controlled.

The folders and bookmarks loaded are shown in a tree at the bottom of the page.
This is a nice tree for better understanding your folder structures and browsing saved bookmarks.

If any duplicates are identified, a "Show Duplicates" button is offered that shows a very detailed list of the duplicates. Various actions can be performed on each duplicate, like Delete, Replace or Merge Title and Move Path.