Rated 5 out of 5 stars

Why in Thunderbird 78.2.2 is not available FTP connection ?
Can you please add that option or fix it ?

This review is for a previous version of the add-on (3.1). 

Probably the new input field is somewhat missleading. ftp/http/https are available. Just enter an address like 'ftp://host.domain.cc/path/to/folder' or 'https://host.domain.cc/path/to/folder'.