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CloseReview for Remove Duplicate Messages by Faisal
Rated 5 out of 5 stars
I used to sometimes check and delete duplicate messages across different folders. But recent Thunderbird updates have removed the "select multiple folders" option, which has broken/limited the functionality of this useful tool. I hope the extension developers will raise this with Thunderbird developers.
This review is for a previous version of the add-on (0.5.4b5).To create your own collections, you must have a Mozilla Add-ons account.