Install, press buttons. Done... mostly. Would recommend "Find broken URLS", , "Remove empty folders", "Merge duplicate folders", "Find duplicated bookmarks". The last one is understandably relatively manual as there is no way for the add-on to know which of the bookmarks you would like to keep.

Only thing I would love to see added is to have the dupes grouped when there are several dupes in the same folders. Maybe re-arrange the buttons to give better flow and maybe an auto button that does each task in the most optimal order...

But really, this is an awesome add-on and does what it says it does.