Developer reply by Sungho Hwang
Rated 1 out of 5 stars
It doesn't work - there is no button
This review is for a previous version of the add-on (46.6).Hi, Firefox user cb9fd6.
PasteMarkdownSyntax version 47.1 is available on Thunderbird 78.1.1. as of 2020-08-21.
I have needed time to update this add-on.
But the required program, AdvancedTasks is seen as not updated.
From Sungho Hwang.
To create your own collections, you must have a Mozilla Add-ons account.