--- a/browser/components/customizableui/content/panelUI.xml
+++ b/browser/components/customizableui/content/panelUI.xml
@@ -67,17 +67,17 @@
   <binding id="panelview">
     <content>
       <xul:box class="panel-header" anonid="header">
         <xul:toolbarbutton anonid="back"
                            class="subviewbutton subviewbutton-iconic subviewbutton-back"
                            closemenu="none"
                            tabindex="0"
                            tooltip="&backCmd.label;"
-                           onclick="document.getBindingParent(this).panelMultiView.goBack()"/>
+                           onclick="document.getBindingParent(this).panelMultiView.goBack(); this.blur()"/>
         <xul:label xbl:inherits="value=title"/>
       </xul:box>
       <children/>
     </content>
     <implementation>
       <property name="header"
                 readonly="true"
                 onget="return document.getAnonymousElementByAttribute(this, 'anonid', 'header');"/>