Not working on OSX with TB 3.1.6 Rated 1 out of 5 stars

I installed "Stationery" because it is presented on the Mozilla webite as working also with Mac-OSX.
Unfortunately your TB extension Stationery 0.6.1 is not working on my Mac-OSX 10.6.4 (Snow Leopard, intel) within my Thunderbird 3.1.6.

Of course, I am not using Outlook Express e-mail-templates, but create my own within TB, than highlighting them and menu-choosing File - Save as template. But the saved templates do not appear after this when clicking on the button for writing a new mail.

If I configure the Stationary options - standard directory (point three) a certain directory on the hard disc no template appears there when "Save as template".

1. Am I wrong to have the expectation that this add-on should work with Mac-OSX? But if it should:
2. Have you any experience/report that it is working correctly on Mac-OSX?
3. Any other advise?

This review is for a previous version of the add-on (0.6.1).