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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..?

这个评论是针对附加组件的一个早期版本的(1.9.7)。 

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