diff --git a/src/plugins/VerticalTabs/verticaltabswidget.h b/src/plugins/VerticalTabs/verticaltabswidget.h
--- a/src/plugins/VerticalTabs/verticaltabswidget.h
+++ b/src/plugins/VerticalTabs/verticaltabswidget.h
@@ -43,6 +43,8 @@
     void switchToNextTab();
     void switchToPreviousTab();
 
+    void addChildTab();
+
 private:
     WebTab *nextTab() const;
     WebTab *previousTab() const;
diff --git a/src/plugins/VerticalTabs/verticaltabswidget.cpp b/src/plugins/VerticalTabs/verticaltabswidget.cpp
--- a/src/plugins/VerticalTabs/verticaltabswidget.cpp
+++ b/src/plugins/VerticalTabs/verticaltabswidget.cpp
@@ -59,6 +59,7 @@
     buttonAddTab->setIcon(QIcon::fromTheme(QSL("list-add")));
     buttonAddTab->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
     connect(buttonAddTab, &QAbstractButton::clicked, m_window, &BrowserWindow::addTab);
+    connect(buttonAddTab, &ToolButton::middleMouseClicked, this, &VerticalTabsWidget::addChildTab);
 
     m_groupMenu = new QMenu(this);
     buttonAddTab->setMenu(m_groupMenu);
@@ -201,3 +202,10 @@
         m_window->tabWidget()->addView(QUrl(QSL("extension://verticaltabs/group")), Qz::NT_SelectedTab);
     });
 }
+
+void VerticalTabsWidget::addChildTab()
+{
+    WebTab *tab = m_window->tabWidget()->webTab();
+    m_window->addTab();
+    m_window->tabWidget()->webTab()->setParentTab(tab);
+}