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Same problem as germanben, the option to create a new local folder do not appear in the "add new " button !

Это отзыв для предыдущей версии этого дополнения (4.2.2). 

Hub
Thanks for not doing a bad review for a question.
I had to change because of the new Thunderbird account settings tab ui. They no longer have a combined action button, but a New account button and separate (and not usable delete button) I now have a main toolbar button that has both the add and remove menu options.

Hope this helps.
Christopher