Rated 2 out of 5 stars
This review is for a previous version of the add-on (0.1.06).
I installed this version of Remove Duplicates at home, by mistake, after using Remove Duplicates (Alternate) at the office.
I went back to the Alternate, when I found this didn't work as well. For one thing, this extension will only put the dupes in the Trash. It does not offer the option to delete the dupes permanently.
Because of a complex setup between two POP mail accounts, two locations, blind copies back and forth and several complex T-bird rules, I often have to retrieve messages which were mis-sorted to the Trash.
With this extension I never knew if the messages I found in the Trash were those I needed to retrieve or those I had previously de-duped.
Now that I'm using the Alternate version, everything works as well at home as at the office.