Had ceased working in FF45 - FIXED !!! Rated 5 out of 5 stars

THE NEW VERSION WORKS THANK YOU!
This is a text book example of why it's so important to support developers by contributing -- Simple Mail is so essential to Firefox that it's the kind of thing you wish was packaged with the program.
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I had posted this review:
I don't know if the culprit is v45 or the latest Java update (I did both in 1 afternoon) but NO version (even the most recent, available elsewhere) works now. Just sits there like a sleepy snail.

This review is for a previous version of the add-on (2.86.6.1-signed). 

FF45

Try this version: https://addons.mozilla.org/en-US/firefox/addon/simple-mail/versions/2.86.8

This has stopped working Rated 1 out of 5 stars

I loved this add-on. Now it doesn't work any more.

This review is for a previous version of the add-on (2.86.6.1-signed).