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is there a fast way to eliminate duplicates in my address book

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I'm not trying to merge address books. I want to eliminate duplicates that are already there.

I'm not trying to merge address books. I want to eliminate duplicates that are already there.

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I use this:

https://addons.mozilla.org/en-US/thunderbird/addon/duplicate-contact-manager/

…but I'm not sure it lets you find duplicates across multiple address books.