I tried a few others, but this one, even though it looks less pretty, was the first one to let me easily remove duplicates without having to manually go through each one.

Does exactly what I needed after I combined bookmarks from numerous devices. Cleaned up over 6000 bookmarks with 70% duplication's. Would have taken me forever! Thank you!

This really helped me with consolidating all of my data from Edge and Chrome to Firefox :)

Чудове розширення для чищення дублікатів закладок, що виникають після усіляких синхронізацій в нашому недолугому Firefox. Підтримка української.

Very helpful

worked well. thanks dev
Firefox should have this as feature.

Does the exact thing it says it does, provides easy macros to select all but one of each duplicated bookmark then erases them all. It does all this on its own page preventing the "popup goes away with all your work" problem. Little more could I ask for from an extension of this type.

Super, ce module, il fait exactement ce que j'attendais. Plusieurs choix sont possibles pour marquer automatiquement les doublons (Dups) ou alors à la main.