---
title: Window.sidebar
slug: Web/API/Window/sidebar
translation_of: Web/API/Window/sidebar
---
<div>
 {{APIRef}} {{SeeCompatTable}}</div>
<p>Returns a sidebar object, which contains several methods for registering add-ons with browser.</p>
<h2 id="Example" name="Example">Example</h2>
<pre class="syntaxbox">window.sidebar.addPanel("Google", "http://www.google.com/", "");
</pre>
<p>Note: the third empty parameter is required!</p>
<h2 id="Notes" name="Notes">Notes</h2>
<p>The sidebar object returned has the following methods:</p>
<table class="fullwidth-table">
 <tbody>
  <tr>
   <th>Method</th>
   <th>Description</th>
  </tr>
  <tr>
   <td><code>addPanel(<var>title</var>, <var>contentURL</var>, <var>customizeURL</var>)</code> {{Obsolete_inline(23)}}</td>
   <td>Adds a sidebar panel. See <a href="/en-US/docs/Creating_a_Firefox_sidebar" title="Creating a Firefox sidebar">Creating a Firefox sidebar</a> for details on sidebars in Firefox 2 and later.</td>
  </tr>
  <tr>
   <td><code>addPersistentPanel(<var>title</var>, <var>contentURL</var>, <var>customizeURL</var>)</code> {{Obsolete_inline(23)}}</td>
   <td>Adds a sidebar panel, which is able to work in the background. This only works in SeaMonkey or Firefox 1.x; Firefox 2 and later will just do <code>addPanel()</code>.</td>
  </tr>
  <tr>
   <td><code>addSearchEngine(<var>engineURL</var>, <var>iconURL</var>, <var>suggestedTitle</var>, <var>suggestedCategory</var>)</code></td>
   <td>Installs a search engine. See <a href="/en-US/docs/Adding_search_engines_from_web_pages" title="Adding_search_engines_from_web_pages">Adding search engines from web pages</a> for details.</td>
  </tr>
  <tr>
   <td><code>addMicrosummaryGenerator(<var>generatorURL</var>)</code> {{gecko_minversion_inline("1.8.1")}} {{Obsolete_inline(6)}}</td>
   <td>Installs a microsummary generator.</td>
  </tr>
 </tbody>
</table>
<h2 id="Specification" name="Specification">Specification</h2>
<p>Mozilla-specific. Not part of any standard.</p>