Rated 5 out of 5 stars

Sugoi - Have you tried version 3.9.2? It works for me on FF31.0, including restoring my 'send all unsent' button which had disappeared.

If you want to try it:

To find version 3.9.2:
Go to, and click on, 'Version Information' almost at the bottom of this page.
In bottom right of the resulting expanded box, click on ' See complete version history'.
That will take you to the 'Versions' page for MagicSLR, where you will see version 3.9.2 at the top.

How to Install in Thunderbird

Right-click on the 'Download' button next to version 3.9.2 and
in the resulting menu, click on 'Save link as' to Download and save the file to your hard disk.
(you will be asked where you want to save it),
In Mozilla Thunderbird, open 'Add-ons' from the Tools menu.
From the options button there next to the add-on search field
(mine is a cog wheel with tooltip *'Tools for all add-ons"),
select "Install Add-on From File..." and
in the resulting 'File Picker' dialogue, go to and select the downloaded add-on.

It should install.
Restart TB.

This review is for a previous version of the add-on (3.9.1).