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Potentially good ... But, different to what the dev says, in the latest TB, I see no setting for Identity chooser under the addons setting..?

Questa recensione riguarda una versione precedente (1.9.7) del componente aggiuntivo. 

Thunderbird changed the location where users can access addon settings with version 60. Please check this support topic: https://support.mozilla.org/en-US/kb/new-thunderbird-60#w_new-menu-location-of-add-on-options