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

Tato recenze je pro předchozí verzi doplňku (12.0.4).  Tento uživatel má jednu dřívější recenzi tohoto doplňku.

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