diff --git a/xpfe/components/sidebar/resources/sidebarOverlay.js b/xpfe/components/sidebar/resources/sidebarOverlay.js
index 14a4b6cb1eea..d85dfdee9a43 100644
--- a/xpfe/components/sidebar/resources/sidebarOverlay.js
+++ b/xpfe/components/sidebar/resources/sidebarOverlay.js
@@ -884,6 +884,7 @@ function SidebarShowHide() {
   // Immediately save persistent values
   document.persist('sidebar-title-box', 'hidden');
   persist_width();
+  window._content.focus();
 }
 
 function SidebarBuildPickerPopup() {