In less than five minutes, I nuked 5,200 duplicate links. They were scattered all over the place, and this tool made light work of the task. If your bookmarks are a mess, this is the "must-have" solution for you. This is a great tool. Hey Mozilla, take notes!

It does exactly what it's supposed to. I reinstall it every so often and it works great. Would be nice if Firefox had native deduplication, but this add-on is the next best thing. Thanks, Martin Väth! 5/5⭐

Saved me what would have been hours.

Needed to get my quite large, over 1000, collection of bookmarks in order. Tried two or three 'duplicate finders'.
Either didn't work cleanly enough, or too confusing.
This one by Martin Väth worked superbly. I knew quickly and easily how to sort.
It worked exactly as I wanted, first putting duplicates into a 'Dupes' folder, allowing you to go back over and double-check.
A couple of bookmarks had gone through incorrectly, and it was no problem to get these sorted.
Very happy with this stable and precise Duplicate Finder addon, would absolutely recommend!

Очень удобно! Спасибо огромное!
Может выглядит аскетично, НО оно делает ровно то что нужно! До этого попробовал другое дополнение, и работать с ним было не возможно, показало сотни дублей и что дальше? В вашем всё продумано для результата - устранение дублей! с 4500 -> 2700

the bookmarks may look gone for now, but the real world test is when you sync to a new computer and sign into firefox, the remotely remembered bookmarks will all come flooding back...

This is the best out there, i wish there was a stand alone exe version that do the exact same thing 5/5 Stars

Could not be easier, and idiot-proof too. Thanks

Finally, an optimized way to (almost) fully sort all the bookmarks at once! Thank you so much for this add-on! 🌟

I've been on Firefox since soon after it came out; somehow, over the years, I've inadvertently added duplicate, not just of single bookmarks, but of entire bookmark backups. Your addon is what I have needed for years. It cleared out several hundred duplicates. Many thanks! John

Великолепное расширение! Я перебрал десятка два отдельных приложений (все, какие нашел) и расширений (проверил ещё не все) - и лучшего по функциональности нет. Здесь сочетается удобство, мощь, гибкость настроек, наглядность результатов и компактность кода. Было собрано около 35000 закладок из разных браузеров, ~22000 дублирующих закладок было удалено этим расширением предельно аккуратно в течение получаса!
В случае остальных приложений за это время удавалось либо вручную удалить из неудобного списка пару сотен ссылок с риском ошибиться, либо... дождаться окончания загрузки закладок в приложение.
В прочих проверенных расширениях для Firefox либо результаты поиска представлены несистематизированной свалкой, либо вовсе отсутствуют.

Так что искренне рекомендую Bookmark Dupes от Martin Väth!

It's slow down so much it makes frozen the app. It's waited for10 minutes without any response. It's just about 18000 -24000 bookmarks to process, certainly from several bookmarks from different times.
Interesting fact is the same addon from the same author works perfectly!!! ..in chrome based browsers(time to response fast to not:chrome,brave,vivaldi).