Rated 5 out of 5 stars

I downloaded B6 but I am unfamiliar with the file type? How do I get that to work in Thunderbird?

This review is for a previous version of the add-on (12.0.4). 

NA
The file is an XPI which is just a zip container for the addon. To install go to Tool/Addons and then to the gear button. Choose Install Add-on from file and locate b6.

If you have issues please raise an issue in Github so we can look and interactively solve the problem.
(also reconsider review for a beta question...%-))
Cheers
Christopher

Rated 5 out of 5 stars

When will it work with TB 115 ?

This review is for a previous version of the add-on (12.0.4). 

NatuersAdvocate
I am actually fairly close with v14 for v115+.
I have a release tracker below that points to the latest beta. B6 is feature complete and well tested. B7 will have an important workaround for a TB mbox problem if you work with mbox files.
If you download please give feedback!
Cheers
Christopher

https://github.com/thundernest/import-export-tools-ng/issues/408