It's a modal dialog not a window. Close it correctly.
Modified: trunk/reactos/apps/utils/getfirefox/getfirefox.c

Modified: trunk/reactos/apps/utils/getfirefox/getfirefox.c
--- trunk/reactos/apps/utils/getfirefox/getfirefox.c	2005-12-13 22:12:01 UTC (rev 20153)
+++ trunk/reactos/apps/utils/getfirefox/getfirefox.c	2005-12-13 22:23:08 UTC (rev 20154)
@@ -359,14 +359,10 @@
       return FALSE;
 
     case WM_CLOSE:
-        DestroyWindow(Dlg);
+        EndDialog(Dlg, 0);
         return TRUE;
 
-    case WM_DESTROY:
-        PostQuitMessage(0);
-        return TRUE;
-
-    default:
+	default:
       return FALSE;
     }
 }