diff --git a/browser/components/customizableui/ToolbarContextMenu.sys.mjs b/browser/components/customizableui/ToolbarContextMenu.sys.mjs
index d5fd707b98e4b163a624c97ff4a8f2574e0b0180..b5d7e84c3567e83b95a6493e8333d3036dc88f36 100644
--- a/browser/components/customizableui/ToolbarContextMenu.sys.mjs
+++ b/browser/components/customizableui/ToolbarContextMenu.sys.mjs
@@ -183,7 +183,7 @@ export var ToolbarContextMenu = {
 
     let showTabStripItems = toolbarItem?.id == "tabbrowser-tabs";
     let isVerticalTabStripMenu =
-      showTabStripItems && toolbarItem.parentElement.id == "vertical-tabs";
+      showTabStripItems && toolbarItem.parentElement.id == "TabsToolbar-customization-target";
 
     if (aInsertPoint) {
       aInsertPoint.hidden = isVerticalTabStripMenu;
@@ -243,10 +243,7 @@ export var ToolbarContextMenu = {
     // Show/hide sidebar and vertical tabs menu items
     let sidebarRevampEnabled = Services.prefs.getBoolPref("sidebar.revamp");
     let showSidebarActions =
-      ["tabbrowser-tabs", "sidebar-button"].includes(toolbarItem?.id) ||
-      toolbarItem?.localName == "toolbarspring" ||
-      isTitlebarSpacer ||
-      isMenuBarSpacer;
+      false;
 
     let toggleVerticalTabsItem = document.getElementById(
       "toolbar-context-toggle-vertical-tabs"
@@ -267,6 +264,7 @@ export var ToolbarContextMenu = {
     document.getElementById("sidebarRevampSeparator").hidden =
       !showSidebarActions || isVerticalTabStripMenu;
     document.getElementById("customizationMenuSeparator").hidden =
+        true ||
       toolbarItem?.id == "tabbrowser-tabs" ||
       (toolbarItem?.localName == "toolbarspring" &&
         !CustomizationHandler.isCustomizing()) ||
