Thunderbird add-on incompatibility?

So, I was reading this article and said why I would love to try-out these addons. Installed Thuderbird using the Software center and tried using them but it’s seems they aren’t up-to-date or I am missing something ?

The first comment of the article says:


Many of these add-ons are legacy extensions and don’t work in Thunderbird 60.

JULY 11, 2018

It looks like the author tested on Fedora 28.