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How can I download/install v1.2.9a - like this add-on, but latest v1.2.9 is unusable with TB v52

Thanks.

Questa recensione riguarda una versione precedente (1.2.9) del componente aggiuntivo. 

As I mentioned above, you can download ver.1.2.9a from support site. Thanks.

[Nov. 14, 2018]
It is with great appreciation, I announce that Confirm-Address 1.3.0 which supports Thunderbird 60.* is now available. I thank all the Confirm-Address users for your patience.