Welcome to Thunderbird Add-ons.
Add extra features and styles to make Thunderbird your own.Close
Rated 5 out of 5 stars
I did not test I actually, but I give 5 stars just because somebody made it possible. For a long time I was missing such a feature, silently hoping that someone will develop an addon like this. So it is'nt really important that there are missing sounds. This addon will help both, developers and users. It is an important step towards a better Firefox.