diff --git a/modules/data/customize_firefox.components.json b/modules/data/customize_firefox.components.json
index 5caa8f2ee..c20269f1d 100644
--- a/modules/data/customize_firefox.components.json
+++ b/modules/data/customize_firefox.components.json
@@ -22,5 +22,11 @@
         "selectorData": "wrapper-search-container",
         "strategy": "id",
         "groups": []
+    },
+
+    "customize-page": {
+        "selectorData": "customization-container",
+        "strategy": "id",
+        "groups": []
     }
 }
\ No newline at end of file
diff --git a/tests/tabs/test_display_customize_button.py b/tests/tabs/test_display_customize_button.py
new file mode 100644
index 000000000..38e14fdae
--- /dev/null
+++ b/tests/tabs/test_display_customize_button.py
@@ -0,0 +1,48 @@
+import pytest
+from selenium.webdriver import Firefox
+
+from modules.browser_object_panel_ui import PanelUi
+from modules.browser_object_tabbar import TabBar
+from modules.page_object import ExamplePage
+from modules.page_object_customize_firefox import CustomizeFirefox
+
+
+@pytest.fixture()
+def test_case():
+    return "134463"
+
+
+def test_customize_button_displayed_in_tab_bar(driver: Firefox):
+    """
+    C134463 - Verify that the Customize button is displayed in the tab bar
+    and the Customize tab persists when switching tabs.
+    """
+
+    panel_ui = PanelUi(driver)
+    tabs = TabBar(driver)
+    custom_page = CustomizeFirefox(driver)
+
+    # Open an initial example page
+    example = ExamplePage(driver)
+    example.open()
+
+    # Open customize firefox toolbar tab
+    panel_ui.open_panel_menu()
+    panel_ui.navigate_to_customize_toolbar()
+
+    tabs.click_tab_by_index(1)
+
+    # Verify that the customize firefox tab is open in background
+    with driver.context(driver.CONTEXT_CHROME):
+        customize_tab = tabs.get_tab(2)
+        assert customize_tab is not None, "Customize tab should still exist."
+        assert tabs.get_tab_title(customize_tab) == "Customize Firefox"
+        assert customize_tab.get_attribute("visuallyselected") != "true", (
+            "Customize tab should be unfocused."
+        )
+
+    # Verify that the customize firefox tab is opened and correct
+    example.switch_to_new_tab()
+    with driver.context(driver.CONTEXT_CHROME):
+        element = custom_page.get_element("customize-page")
+        assert element, "element not found"