Рейтинг 1 из 5 звёзд

Simply doesn't work. No instructions for HOW it's supposed to work, and nothing I try shows any kind of options.

Это отзыв для предыдущей версии этого дополнения (5.0.0). 

please make sure you selected unified view mode. if you look at end of list. you see that email folders disappears. look at screenshot of addon in this page to find differences:

https://addons.thunderbird.net/en-US/thunderbird/addon/hide-email-folders/