Rated 5 out of 5 stars
I've found the download for the new .xpi file on GitHub at https://github.com/arivald/tbirdExt/blob/master/xpi%20archive/stationery-1.0.0.xpi so can be installed manually.This review is for a previous version of the add-on (0.9.0.2).
Rated 4 out of 5 stars
This is a great Add-on which I have been using for many years but unfortunately does not work with the latest version of Thunderbird which is causing me problems. I would appreciate it if this could be updated to work with TB 60 as soon as possible. Unfortunately it did not flag up incompatible add-ons before TB updated so I am already on TB 60.This review is for a previous version of the add-on (0.9.0.2).