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autor: Firefox user ad21e5 wystawiona: Paź. 15, 2019 ·

It's OK and seems to find duplicates accurately but needs a way to set default KEEP / DELETE options. Reversing the defaults by hand is impossible with 100s or 1000s of duplicates.

Ta opinia jest o wcześniejszej wersji dodatku (1.5). 

przez Dillinger (Autor) dnia Paź. 16, 2019 ·

You can set which duplicates you prefer to delete in the options: first found, unread etc.
You can also reverse the search direction.
Just experiment a bit, there probably is a setting that matches your preferences.