I had a duplicate bookmarks remover years ago which unfortunately disappeared due to a dispute between the author and mozilla. Nothin since has been very good until this. This is great! It's easy, It's fast, it's flexible.

I like the fact you can choose (if duplicate and one is from this directory mark that one to be removed). That worked great since a lot of my duplicates were due to imports from google and safari over time. Also at times when in a hurry I just bookmark all my tabs in a nonsense directory to deal with later (then maybe don't). So this feature is great!.

I haven't used advanced features yet. So I can't speak to those, but the basic setup is great!