diff --git a/Libraries/LibGUI/Menu.cpp b/Libraries/LibGUI/Menu.cpp
index ac3516b08a..77623dd267 100644
--- a/Libraries/LibGUI/Menu.cpp
+++ b/Libraries/LibGUI/Menu.cpp
@@ -83,15 +83,15 @@ void Menu::add_separator()
     m_items.append(make<MenuItem>(m_menu_id, MenuItem::Type::Separator));
 }
 
-void Menu::realize_if_needed()
+void Menu::realize_if_needed(const RefPtr<Action>& default_action)
 {
-    if (m_menu_id == -1)
-        realize_menu();
+    if (m_menu_id == -1 || m_last_default_action.ptr() != default_action)
+        realize_menu(default_action);
 }
 
-void Menu::popup(const Gfx::IntPoint& screen_position)
+void Menu::popup(const Gfx::IntPoint& screen_position, const RefPtr<Action>& default_action)
 {
-    realize_if_needed();
+    realize_if_needed(default_action);
     WindowServerConnection::the().post_message(Messages::WindowServer::PopupMenu(m_menu_id, screen_position));
 }
 
@@ -102,7 +102,7 @@ void Menu::dismiss()
     WindowServerConnection::the().post_message(Messages::WindowServer::DismissMenu(m_menu_id));
 }
 
-int Menu::realize_menu()
+int Menu::realize_menu(RefPtr<Action> default_action)
 {
     m_menu_id = WindowServerConnection::the().send_sync<Messages::WindowServer::CreateMenu>(m_name)->menu_id();
 
@@ -120,8 +120,8 @@ int Menu::realize_menu()
         }
         if (item.type() == MenuItem::Type::Submenu) {
             auto& submenu = *item.submenu();
-            submenu.realize_if_needed();
-            WindowServerConnection::the().send_sync<Messages::WindowServer::AddMenuItem>(m_menu_id, i, submenu.menu_id(), submenu.name(), true, false, false, "", -1, false);
+            submenu.realize_if_needed(default_action);
+            WindowServerConnection::the().send_sync<Messages::WindowServer::AddMenuItem>(m_menu_id, i, submenu.menu_id(), submenu.name(), true, false, false, false, "", -1, false);
             continue;
         }
         if (item.type() == MenuItem::Type::Action) {
@@ -143,10 +143,12 @@ int Menu::realize_menu()
             }
             auto shortcut_text = action.shortcut().is_valid() ? action.shortcut().to_string() : String();
             bool exclusive = action.group() && action.group()->is_exclusive() && action.is_checkable();
-            WindowServerConnection::the().send_sync<Messages::WindowServer::AddMenuItem>(m_menu_id, i, -1, action.text(), action.is_enabled(), action.is_checkable(), action.is_checkable() ? action.is_checked() : false, shortcut_text, icon_buffer_id, exclusive);
+            bool is_default = (default_action.ptr() == &action);
+            WindowServerConnection::the().send_sync<Messages::WindowServer::AddMenuItem>(m_menu_id, i, -1, action.text(), action.is_enabled(), action.is_checkable(), action.is_checkable() ? action.is_checked() : false, is_default, shortcut_text, icon_buffer_id, exclusive);
         }
     }
     all_menus().set(m_menu_id, this);
+    m_last_default_action = default_action ? default_action->make_weak_ptr() : nullptr;
     return m_menu_id;
 }
 
@@ -159,6 +161,12 @@ void Menu::unrealize_menu()
     m_menu_id = 0;
 }
 
+void Menu::realize_menu_if_needed()
+{
+    if (menu_id() == -1)
+        realize_menu();
+}
+
 Action* Menu::action_at(size_t index)
 {
     if (index >= m_items.size())
diff --git a/Libraries/LibGUI/Menu.h b/Libraries/LibGUI/Menu.h
index 2b56e04d35..211e174798 100644
--- a/Libraries/LibGUI/Menu.h
+++ b/Libraries/LibGUI/Menu.h
@@ -27,7 +27,9 @@
 #pragma once
 
 #include <AK/NonnullOwnPtrVector.h>
+#include <AK/WeakPtr.h>
 #include <LibCore/Object.h>
+#include <LibGUI/Action.h>
 #include <LibGUI/Forward.h>
 #include <LibGfx/Forward.h>
 
@@ -39,11 +41,7 @@ public:
     explicit Menu(const StringView& name = "");
     virtual ~Menu() override;
 
-    void realize_menu_if_needed()
-    {
-        if (menu_id() == -1)
-            realize_menu();
-    }
+    void realize_menu_if_needed();
 
     static Menu* from_menu_id(int);
     int menu_id() const { return m_menu_id; }
@@ -56,19 +54,20 @@ public:
     void add_separator();
     Menu& add_submenu(const String& name);
 
-    void popup(const Gfx::IntPoint& screen_position);
+    void popup(const Gfx::IntPoint& screen_position, const RefPtr<Action>& default_action = nullptr);
     void dismiss();
 
 private:
     friend class MenuBar;
 
-    int realize_menu();
+    int realize_menu(RefPtr<Action> default_action = nullptr);
     void unrealize_menu();
-    void realize_if_needed();
+    void realize_if_needed(const RefPtr<Action>& default_action);
 
     int m_menu_id { -1 };
     String m_name;
     NonnullOwnPtrVector<MenuItem> m_items;
+    WeakPtr<Action> m_last_default_action;
 };
 
 }
diff --git a/Libraries/LibGUI/MenuItem.cpp b/Libraries/LibGUI/MenuItem.cpp
index cc6aa81b22..8c6e5a92ec 100644
--- a/Libraries/LibGUI/MenuItem.cpp
+++ b/Libraries/LibGUI/MenuItem.cpp
@@ -79,13 +79,22 @@ void MenuItem::set_checked(bool checked)
     update_window_server();
 }
 
+void MenuItem::set_default(bool is_default)
+{
+    ASSERT(is_checkable());
+    if (m_default == is_default)
+        return;
+    m_default = is_default;
+    update_window_server();
+}
+
 void MenuItem::update_window_server()
 {
     if (m_menu_id < 0)
         return;
     auto& action = *m_action;
     auto shortcut_text = action.shortcut().is_valid() ? action.shortcut().to_string() : String();
-    WindowServerConnection::the().send_sync<Messages::WindowServer::UpdateMenuItem>(m_menu_id, m_identifier, -1, action.text(), action.is_enabled(), action.is_checkable(), action.is_checkable() ? action.is_checked() : false, shortcut_text);
+    WindowServerConnection::the().send_sync<Messages::WindowServer::UpdateMenuItem>(m_menu_id, m_identifier, -1, action.text(), action.is_enabled(), action.is_checkable(), action.is_checkable() ? action.is_checked() : false, m_default, shortcut_text);
 }
 
 void MenuItem::set_menu_id(Badge<Menu>, unsigned int menu_id)
diff --git a/Libraries/LibGUI/MenuItem.h b/Libraries/LibGUI/MenuItem.h
index 871690a805..1441061661 100644
--- a/Libraries/LibGUI/MenuItem.h
+++ b/Libraries/LibGUI/MenuItem.h
@@ -47,7 +47,7 @@ public:
     ~MenuItem();
 
     Type type() const { return m_type; }
-    String text() const;
+
     const Action* action() const { return m_action.ptr(); }
     Action* action() { return m_action.ptr(); }
     unsigned identifier() const { return m_identifier; }
@@ -64,6 +64,9 @@ public:
     bool is_enabled() const { return m_enabled; }
     void set_enabled(bool);
 
+    bool is_default() const { return m_default; }
+    void set_default(bool);
+
     void set_menu_id(Badge<Menu>, unsigned menu_id);
     void set_identifier(Badge<Menu>, unsigned identifier);
 
@@ -76,6 +79,7 @@ private:
     bool m_enabled { true };
     bool m_checkable { false };
     bool m_checked { false };
+    bool m_default { false };
     RefPtr<Action> m_action;
     RefPtr<Menu> m_submenu;
 };
diff --git a/Services/WindowServer/ClientConnection.cpp b/Services/WindowServer/ClientConnection.cpp
index 4934d6a03d..d62d92a930 100644
--- a/Services/WindowServer/ClientConnection.cpp
+++ b/Services/WindowServer/ClientConnection.cpp
@@ -201,6 +201,8 @@ OwnPtr<Messages::WindowServer::AddMenuItemResponse> ClientConnection::handle(con
     }
     auto& menu = *(*it).value;
     auto menu_item = make<MenuItem>(menu, identifier, message.text(), message.shortcut(), message.enabled(), message.checkable(), message.checked());
+    if (message.is_default())
+        menu_item->set_default(true);
     if (message.icon_buffer_id() != -1) {
         auto icon_buffer = SharedBuffer::create_from_shbuf_id(message.icon_buffer_id());
         if (!icon_buffer)
@@ -260,6 +262,7 @@ OwnPtr<Messages::WindowServer::UpdateMenuItemResponse> ClientConnection::handle(
     menu_item->set_shortcut_text(message.shortcut());
     menu_item->set_enabled(message.enabled());
     menu_item->set_checkable(message.checkable());
+    menu_item->set_default(message.is_default());
     if (message.checkable())
         menu_item->set_checked(message.checked());
     return make<Messages::WindowServer::UpdateMenuItemResponse>();
diff --git a/Services/WindowServer/WindowServer.ipc b/Services/WindowServer/WindowServer.ipc
index 3e3801247f..8fb0b93318 100644
--- a/Services/WindowServer/WindowServer.ipc
+++ b/Services/WindowServer/WindowServer.ipc
@@ -21,13 +21,14 @@ endpoint WindowServer = 2
         bool enabled,
         bool checkable,
         bool checked,
+        bool is_default,
         [UTF8] String shortcut,
         i32 icon_buffer_id,
         bool exclusive) => ()
 
     AddMenuSeparator(i32 menu_id) => ()
 
-    UpdateMenuItem(i32 menu_id, i32 identifier, i32 submenu_id, [UTF8] String text, bool enabled, bool checkable, bool checked, [UTF8] String shortcut) => ()
+    UpdateMenuItem(i32 menu_id, i32 identifier, i32 submenu_id, [UTF8] String text, bool enabled, bool checkable, bool checked, bool is_default, [UTF8] String shortcut) => ()
 
     CreateWindow(
         Gfx::IntRect rect,