Flat Folder Tree

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от Gyrocode.com на Авг. 11, 2017 · постоянна връзка

I am surprised this hasn't been mentioned before. There is much simpler solution available that no longer requires add-on.

See this post for more details and screenshots:
https://www.gyrocode.com/articles/how-to-hide-gmail-folder-in-mozilla-thunderbird-using-imap/