It's a decent tool and does a good job of finding dupes! But there're no mass commands or buttons to deal with the dupes in one shot but rather you have to sit there and manually click on every dupe checkbox to take action.

The Find Broken URLs is a good feature but many websites like linkedin, facebook that do not allow webscrapers, see it as a threat, causing Bookmarks Organizer to generate a false positive report that the bookmark is broken or dead. The average person using this add-on needs to see friendlier http errors such as "the target web url does not allow remote checking!" as opposed to http 404!