diff --git a/useractions.h b/useractions.h
--- a/useractions.h
+++ b/useractions.h
@@ -120,10 +120,6 @@
      * Adjust the items according to the respective Client.
      */
     void menuAboutToShow();
-    /**
-     * Adjusts the add to tab group menu to the current value of the Client.
-     */
-    void rebuildTabGroupPopup();
     /**
      * Adjusts the switch to tab menu to the current values of the Client.
      */
@@ -210,10 +206,6 @@
      * Oh, and an 'all' option too of course
      */
     void initActivityPopup();
-    /**
-     * Creates the Window Tabbing related menus.
-     */
-    void initTabbingPopups();
     /**
      * Shows a helper Dialog to inform the user how to get back in case he triggered
      * an action which hides the window decoration (e.g. NoBorder or Fullscreen).
@@ -241,10 +233,6 @@
      * The activities sub menu.
      */
     QMenu* m_activityMenu;
-    /**
-     * Menu to add the group to other group.
-     */
-    QMenu* m_addTabsMenu;
     /**
      * Menu to change tab.
      */
@@ -264,14 +252,6 @@
     QAction* m_minimizeOperation;
     QAction* m_closeOperation;
     QAction* m_shortcutOperation;
-    /**
-     * Remove client from group.
-     */
-    QAction* m_removeFromTabGroup;
-    /**
-     * Close all clients in the group.
-     */
-    QAction* m_closeTabGroup;
     /**
      * The Client for which the menu is shown.
      */
diff --git a/useractions.cpp b/useractions.cpp
--- a/useractions.cpp
+++ b/useractions.cpp
@@ -81,7 +81,6 @@
     , m_desktopMenu(NULL)
     , m_screenMenu(NULL)
     , m_activityMenu(NULL)
-    , m_addTabsMenu(NULL)
     , m_switchToTabMenu(NULL)
     , m_scriptsMenu(NULL)
     , m_resizeOperation(NULL)
@@ -94,8 +93,6 @@
     , m_noBorderOperation(NULL)
     , m_minimizeOperation(NULL)
     , m_closeOperation(NULL)
-    , m_removeFromTabGroup(NULL)
-    , m_closeTabGroup(NULL)
 {
 }
 
@@ -376,22 +373,6 @@
 
     m_menu->addSeparator();
 
-    // Actions for window tabbing
-    if (false) {
-        m_removeFromTabGroup = m_menu->addAction(i18n("&Untab"));
-        setShortcut(m_removeFromTabGroup, QStringLiteral("Untab"));
-        m_removeFromTabGroup->setData(Options::RemoveTabFromGroupOp);
-
-        m_closeTabGroup = m_menu->addAction(i18n("Close Entire &Group"));
-        m_closeTabGroup->setIcon(QIcon::fromTheme(QStringLiteral("window-close")));
-        setShortcut(m_closeTabGroup, QStringLiteral("Close TabGroup"));
-        m_closeTabGroup->setData(Options::CloseTabGroupOp);
-
-        m_menu->addSeparator();
-    }
-
-    m_menu->addSeparator();
-
     action = m_menu->addMenu(advancedMenu);
     action->setText(i18n("&More Actions"));
 
@@ -412,7 +393,6 @@
     m_screenMenu = NULL;
     m_activityMenu = NULL;
     m_switchToTabMenu = NULL;
-    m_addTabsMenu = NULL;
     m_scriptsMenu = NULL;
 }
 
@@ -453,17 +433,9 @@
     m_closeOperation->setEnabled(m_client->isCloseable());
     m_shortcutOperation->setEnabled(m_client->rules()->checkShortcut(QString()).isNull());
 
-    if (false) {
-        initTabbingPopups();
-        m_addTabsMenu->setPalette(m_client->palette());
-    } else {
-        delete m_addTabsMenu;
-        m_addTabsMenu = 0;
-    }
-
     // drop the existing scripts menu
     delete m_scriptsMenu;
-    m_scriptsMenu = NULL;
+    m_scriptsMenu = nullptr;
     // ask scripts whether they want to add entries for the given Client
     QList<QAction*> scriptActions = Scripting::self()->actionsForUserActionMenu(m_client.data(), m_scriptsMenu);
     if (!scriptActions.isEmpty()) {
@@ -566,52 +538,6 @@
     }
 }
 
-void UserActionsMenu::rebuildTabGroupPopup()
-{
-    Q_ASSERT(m_addTabsMenu);
-
-    m_addTabsMenu->clear();
-    const auto &clientList = Workspace::self()->allClientList();
-    for (auto i = clientList.constBegin(), end = clientList.constEnd(); i != end; ++i) {
-        if (*i == m_client.data() || (*i)->noBorder())
-            continue;
-        m_addTabsMenu->addAction(shortCaption((*i)->caption()))->setData(QVariant::fromValue(*i));
-    }
-    if (m_addTabsMenu->actions().isEmpty())
-        m_addTabsMenu->addAction(i18nc("There's no window available to be attached as tab to this one", "None available"))->setEnabled(false);
-}
-
-void UserActionsMenu::initTabbingPopups()
-{
-    bool needTabManagers = false;
-    Q_ASSERT(m_client);
-    if (!m_client)
-        return;
-    if (m_client->tabGroup() && m_client->tabGroup()->count() > 1) {
-        needTabManagers = true;
-        if (!m_switchToTabMenu) {
-            m_switchToTabMenu = new QMenu(i18n("Switch to Tab"), m_menu);
-            connect(m_switchToTabMenu, &QMenu::triggered,   this, &UserActionsMenu::selectPopupClientTab);
-            connect(m_switchToTabMenu, &QMenu::aboutToShow, this, &UserActionsMenu::rebuildTabListPopup);
-            m_menu->insertMenu(m_removeFromTabGroup, m_switchToTabMenu);
-        }
-    } else {
-        delete m_switchToTabMenu;
-        m_switchToTabMenu = 0;
-    }
-
-    if (!m_addTabsMenu) {
-        m_addTabsMenu = new QMenu(i18n("&Attach as tab to"), m_menu);
-        connect(m_addTabsMenu, &QMenu::triggered,   this, &UserActionsMenu::entabPopupClient);
-        connect(m_addTabsMenu, &QMenu::aboutToShow, this, &UserActionsMenu::rebuildTabGroupPopup);
-        m_menu->insertMenu(m_removeFromTabGroup, m_addTabsMenu);
-    }
-
-    m_addTabsMenu->menuAction()->setEnabled(!m_client->isFullScreen());
-    m_removeFromTabGroup->setVisible(needTabManagers);
-    m_closeTabGroup->setVisible(needTabManagers);
-}
-
 void UserActionsMenu::initDesktopPopup()
 {
     if (kwinApp()->operationMode() == Application::OperationModeWaylandOnly ||