Rated 1 out of 5 stars

Doesn’t work anymore, at all.

…says “searching for duplicate messages”, perhaps checks/updates folders while searching.
But doesn’t remove anything. There used to be a confirmation dialog before any deletions happen, but it doesn’t open anymore.
And yes, I have tons of duplicates.

Version is 0.6.2 on Betterbird 128.9

This review is for a previous version of the add-on (0.6.2). 

You seem to be encountering a bug. Please file a bug report here: https://github.com/eyalroz/removedupes/issues