Rated 4 out of 5 stars

Why this addon doesn't autoupdate from Thunderbird??
And why it doesn't even appear on the thunderbird addon search engine?
Can't you make it compatible with Thunderbird Beta?

This review is for a previous version of the add-on (1.4.9). 

Hi, this addon is not auto-updated and not referenced because it is still not reviewed by addons.thunderbird.net.
It will probably not be, because its technology is outdated and will not survive to Thunderbird 68 scheduled for late 2019.
I plan a new addon for Thunderbird Beta (65+) that will include the features expected using the new technologies available.
The page of this addon and the GitHub repository will be updated accordingly.