diff --git a/app/SysTray-X/systrayx.cpp b/app/SysTray-X/systrayx.cpp
index 2d2ce56..60d3464 100644
--- a/app/SysTray-X/systrayx.cpp
+++ b/app/SysTray-X/systrayx.cpp
@@ -38,6 +38,14 @@ SysTrayX::SysTrayX( QObject *parent ) : QObject( parent )
      */
     m_win_ctrl = new WindowCtrl( m_preferences );
 
+    if( !m_win_ctrl->thunderbirdStart() )
+    {
+        /*
+         *  Let's quit
+         */
+        exit(0);
+    }
+
     /*
      *  Setup the link
      */
diff --git a/app/SysTray-X/windowctrl.cpp b/app/SysTray-X/windowctrl.cpp
index 09c38d4..2b5313b 100644
--- a/app/SysTray-X/windowctrl.cpp
+++ b/app/SysTray-X/windowctrl.cpp
@@ -50,6 +50,18 @@ WindowCtrl::WindowCtrl( Preferences* pref, QObject *parent )
 }
 
 
+/*
+ *  Is thunderbird our parent?
+ */
+bool    WindowCtrl::thunderbirdStart() const
+{
+   return isThunderbird( getPpid() );
+}
+
+
+/*
+ *  Test func 1
+ */
 void    WindowCtrl::slotWindowTest1()
 {
     emit signalConsole("Test 1 started");
@@ -67,6 +79,9 @@ void    WindowCtrl::slotWindowTest1()
 }
 
 
+/*
+ *  Test func 2
+ */
 void    WindowCtrl::slotWindowTest2()
 {
     emit signalConsole("Test 2 started");
@@ -81,6 +96,9 @@ void    WindowCtrl::slotWindowTest2()
 }
 
 
+/*
+ *  Test func 3
+ */
 void    WindowCtrl::slotWindowTest3()
 {
     emit signalConsole("Test 3 started");
diff --git a/app/SysTray-X/windowctrl.h b/app/SysTray-X/windowctrl.h
index e17dd4c..de89bc1 100644
--- a/app/SysTray-X/windowctrl.h
+++ b/app/SysTray-X/windowctrl.h
@@ -40,6 +40,13 @@ class WindowCtrl : public QObject
          */
         explicit WindowCtrl( Preferences* pref, QObject *parent = nullptr );
 
+        /**
+         * @brief thunderbirdStart. Has the app been started by TB.
+         *
+         * @return  True if Thunderbird is our parent.
+         */
+        bool    thunderbirdStart() const;
+
     public slots:
 
         /**