5 つ星中 5つの評価を受けています

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

これは以前のバージョン (12.0.4) についてのレビューです。  このユーザーはこのアドオンについて 過去に 1 件のレビュー を書いています。

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