Review for Duplicate Contact Manager by icekarim
Rated 5 out of 5 stars
Works fine on last thunderbird version !
Sorry I didn't check correctly.
MUST select the address book first
Has a progress status bar
If more then 2 duplicates (4 or five of the same) must launch again...
The only duplicate addresse plugin on thunderbird.
To create your own collections, you must have a Mozilla Add-ons account.