Rated 5 out of 5 stars

Thanks. It works great (v1.3.1 on win7, thunderbird x64 v68.7.0).

I would have only one suggestion if it can be implemented. It would be good in the new version of the add-on if you can limit the characters for the subject line in the popup alert. Probably somewhere around 30 characters.

The popup alert in Thunderbird has been changed since version 68 by removing the limit from the subject line, which is a very bad decision because now you can get huge tray alerts if the email subject is too long (especially spam).