--- cinnamon-5.8.1/files/usr/share/cinnamon/applets/grouped-window-list@cinnamon.org/settings-schema.json.orig	2023-06-14 06:23:56.383553556 +0200
+++ cinnamon-5.8.1/files/usr/share/cinnamon/applets/grouped-window-list@cinnamon.org/settings-schema.json	2023-06-14 06:25:47.438575265 +0200
@@ -137,7 +137,7 @@
   },
   "pinned-apps": {
     "type": "generic",
-    "default": ["nemo.desktop", "firefox.desktop", "org.gnome.Terminal.desktop"]
+    "default": ["nemo.desktop", "firefox.desktop", "thunderbird.desktop", "org.gnome.Terminal.desktop"]
   },
   "group-apps": {
     "type": "checkbox",