The guy who posted the previous review was referring to the forever looping logo animation overlay that prevents you to even delete the 1 duplicate it finds (though you can do it manually via library)
https://github.com/cadeyrn/bookmarks-organizer/issues/48 since Aug 14

Or another one with a screenshot https://github.com/cadeyrn/bookmarks-organizer/issues/46 since Aug 7

The broken search sometimes does work sometimes won't finish , from what i understand there is a needed api that is not yet available (atleast on the stable ffx release)

This extension has potential when the 57 hits , looking foward to test it (no new update rip rating)