I am new to Thunderbird email after years of using the KOffice suite in KDE, once that stopped working I decided to switch. I saw a notice that email notifications are being worked on, I just wanted to document the behavior I am seeing in case it's helpful in any way. I am running on openSUSE 15.6, Thunderbird 128.7 in the KDE Desktop environment (Plasma Version 5.27.11, Frameworks 5.115.0) I have my Thunderbird settings to show an Alert, Use the system notifications and play a sound, the default. The sound plays, but never is there a pop-up to draw attention to it. The notification is set to show Preview Text, Subject and Sender. Thank you.