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

Това е отзив за предно издание на добавката (12.0.4).  Потребителят има предишен отзив към добавката.

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