--- a/browser/components/extensions/ext-sidebarAction.js
+++ b/browser/components/extensions/ext-sidebarAction.js
@@ -177,17 +177,17 @@ this.sidebarAction = class extends Exten
     broadcaster.setAttribute("autoCheck", "false");
     broadcaster.setAttribute("type", "checkbox");
     broadcaster.setAttribute("group", "sidebar");
     broadcaster.setAttribute("label", details.title);
     broadcaster.setAttribute("sidebarurl", this.sidebarUrl(details.panel));
 
     // oncommand gets attached to menuitem, so we use the observes attribute to
     // get the command id we pass to SidebarUI.
-    broadcaster.setAttribute("oncommand", "SidebarUI.show(this.getAttribute('observes'))");
+    broadcaster.setAttribute("oncommand", "SidebarUI.toggle(this.getAttribute('observes'))");
 
     let header = document.getElementById("sidebar-switcher-target");
     header.addEventListener("SidebarShown", this.updateHeader);
 
     // Insert a menuitem for View->Show Sidebars.
     let menuitem = document.createElementNS(XUL_NS, "menuitem");
     menuitem.setAttribute("id", this.menuId);
     menuitem.setAttribute("observes", this.id);