Avaliado em 5 de 5 estrelas

I use this because it helps & the idea is right, but I have a lot of duplicates that it doesn't find.
I cannot find any differences but there must be some, such as a few seconds difference in Received time(?) but there's no way to set any "ignore" criteria like in C-Cleaner's Duplicate (Files) Finder.

Edit: I can't reply to your reply so I will do so here -
Thanks. I was looking for the "Add-on settings" in Tools > "Remove Duplicates..." where all I got was a short list of messages.
There's no "button" in the toolbar from what I can see?
But I've just found "Options" in the Extensions > More link where I can set criteria.

Esta análise é para uma versão anterior da extensão (0.3.12). 

You can use the add-on settings dialog to choose which criteria to use for the comparison. Also, the toolbar button has an integrated drop-down menu from which you can select the criteria.