diff --git a/app/SysTray-X/SysTray-X-app/windowctrl-unix.cpp b/app/SysTray-X/SysTray-X-app/windowctrl-unix.cpp
index 33ae7a0..cbf77e3 100644
--- a/app/SysTray-X/SysTray-X-app/windowctrl-unix.cpp
+++ b/app/SysTray-X/SysTray-X-app/windowctrl-unix.cpp
@@ -131,7 +131,8 @@ qint64  WindowCtrlUnix::getPpid() const
  */
 bool    WindowCtrlUnix::isThunderbird( qint64 pid ) const
 {
-    return getProcessName( pid ).contains( "thunderbird", Qt::CaseInsensitive );
+    return getProcessName( pid ).contains( "thunderbird", Qt::CaseInsensitive ) ||
+            getProcessName( pid ).contains( "betterbird", Qt::CaseInsensitive );
 }
 
 
diff --git a/app/SysTray-X/SysTray-X-app/windowctrl-win.cpp b/app/SysTray-X/SysTray-X-app/windowctrl-win.cpp
index 65a50a8..c905255 100644
--- a/app/SysTray-X/SysTray-X-app/windowctrl-win.cpp
+++ b/app/SysTray-X/SysTray-X-app/windowctrl-win.cpp
@@ -127,7 +127,8 @@ qint64  WindowCtrlWin::getPpid() const
  */
 bool    WindowCtrlWin::isThunderbird( qint64 pid ) const
 {
-    return getProcessName( pid ).contains( "thunderbird", Qt::CaseInsensitive );
+    return getProcessName( pid ).contains( "thunderbird", Qt::CaseInsensitive ) ||
+            getProcessName( pid ).contains( "betterbird", Qt::CaseInsensitive );
 }