Rated 5 out of 5 stars

Thank you Happyone! All works fine now.
However, I discovered the fixed version does not work in the latest beta version, 58.0b2 (2017.12.10). Maybe that's a known limitation?, I don't know. I reinstalled the latest TB release 52.5.2 and then installed the fixed add-on here (after removing the old one) and things are back working. Thank you!


(previous comment, with 1 star rating)
The latest version 62.0 (from Nov 15, 2017) does not work at all in the latest 32-bit Thunderbird, v52.5.2. There is no option in the Tools menu, nor any status bar button, in other words, no way to access the settings. This makes the add-on currently rather useless.

Please fix. Thanks!

Meanwhile, will try the fix others have detailed in the comments.

This review is for a previous version of the add-on (62.0). 

Hello, please do not install other add-ons other than official page. Those may steal your mails and important files from your computer. Uninstall the other add-ons that are not offered by us.