Puntuado con 5 de 5 estrellas

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

Esta valoración es de una versión anterior del complemento (12.0.4).  Este usuario tiene una valoración anterior de este complemento.

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