--- a/browser/components/customizableui/test/browser.ini
+++ b/browser/components/customizableui/test/browser.ini
@@ -113,10 +113,11 @@ skip-if = os == "linux"
 [browser_993322_widget_notoolbar.js]
 [browser_995164_registerArea_during_customize_mode.js]
 [browser_996364_registerArea_different_properties.js]
 [browser_996635_remove_non_widgets.js]
 [browser_1003588_no_specials_in_panel.js]
 [browser_1007336_lwthemes_in_customize_mode.js]
 [browser_1008559_anchor_undo_restore.js]
 [browser_1042100_default_placements_update.js]
+[browser_1058573_showToolbarsDropdown.js]
 [browser_bootstrapped_custom_toolbar.js]
 [browser_panel_toggle.js]

new file mode 100644
--- /dev/null
+++ b/browser/components/customizableui/test/browser_1058573_showToolbarsDropdown.js
@@ -0,0 +1,25 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+add_task(function() {
+  info("Check that toggleable toolbars dropdown in always shown");
+
+  info("Remove all possible custom toolbars");
+  yield removeCustomToolbars();
+
+  info("Enter customization mode");
+  yield startCustomizing();
+
+  let toolbarsToggle = document.getElementById("customization-toolbar-visibility-button");
+  ok(toolbarsToggle, "The toolbars toggle dropdown exists");
+  ok(!toolbarsToggle.hasAttribute("hidden"),
+     "The toolbars toggle dropdown is displayed");
+});
+
+add_task(function asyncCleanup() {
+  info("Exit customization mode");
+  yield endCustomizing();
+});