Ohodnoceno 1 z 5 hvězdiček

od Matt dne Zář. 28, 2018 · trvalý odkaz

The information provided it very lacking but I managed to find out how to install this using Thunderbird 52.9.1.

1) Download the .xpi file.
2) Go to Tools->Add-ons
3) Click the cog and select "Install Add-on From File"

Hope that helps!