This add-on never worked properly when trying to work with existing bookmarks. Not only were there multiple steps in an overly complicated install (Am I installing a separate tool? Why the separate forms tool? Trying to bundle with a paid business version?), but support never followed up on an open ticket other than to say "It works for us on version 58". Weeks have gone by after submitting the captures as requested of the error when trying to import bookmarks. They never fixed the problem nor offered any help.