Rated 5 out of 5 stars

Not working in Thunderbird 73.0b1 for me:

The file jar:file:///Applications/Thunderbird.app/Contents/Resources/omni.ja!/chrome/messenger/content/messenger/addressbook/addressbook.xul cannot be found. Please check the location and try again.

(Update): Alas, I was afraid that was the case. Thanks for the hard work up to this point!

This review is for a previous version of the add-on (2.0). 

Thank you for pointing that out.
Unfortunately this addon only works up to version tb 70,
because mozilla has made a major change by switching from xul to xhtml for future versions.
Adjusting this change is to much work for me, so i will end the support for further versions.