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+---
+title: Window.sidebar
+slug: Web/API/Window/sidebar
+tags:
+  - DOM
+  - NeedsTranslation
+  - Non-standard
+  - Property
+  - Reference
+  - TopicStub
+  - Window
+translation_of: Web/API/Window/sidebar
+---
+<div>{{APIRef}} {{Non-standard_header}}</div>
+
+<p>Returns a sidebar object, which contains several methods for registering add-ons with the browser.</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 (SeaMonkey)</th>
+   <th>Description (Firefox)</th>
+  </tr>
+  <tr>
+   <td><code>addPanel(<var>title</var>, <var>contentURL</var>, "")</code></td>
+   <td>Adds a sidebar panel.</td>
+   <td rowspan="2">Obsolete since Firefox 23 (only present in SeaMonkey).<br>
+    End users can use the "load this bookmark in the sidebar" option instead. Also see <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Creating_a_Firefox_sidebar">Creating a Firefox sidebar.</a></td>
+  </tr>
+  <tr>
+   <td><code>addPersistentPanel(<var>title</var>, <var>contentURL</var>, "")</code></td>
+   <td>Adds a sidebar panel, which is able to work in the background.</td>
+  </tr>
+  <tr>
+   <td><code>AddSearchProvider(<em>descriptionURL)</em></code></td>
+   <td colspan="2">Installs a search provider (OpenSearch). <a href="/en-US/docs/Web/API/Window/sidebar/Adding_search_engines_from_Web_pages#Installing_OpenSearch_plugins" title="Adding_search_engines_from_web_pages">Adding OpenSearch search engines </a>contains more details. Added in Firefox 2.</td>
+  </tr>
+  <tr>
+   <td><code>addSearchEngine(<var>engineURL</var>, <var>iconURL</var>, <var>suggestedTitle</var>, <var>suggestedCategory</var>)</code> {{Obsolete_inline(44)}}</td>
+   <td colspan="2">Installs a search engine (Sherlock). <a href="/en-US/docs/Web/API/Window/sidebar/Adding_search_engines_from_Web_pages#Installing_Sherlock_plugins" title="Adding_search_engines_from_web_pages">Adding Sherlock search engines </a>contains more details.</td>
+  </tr>
+  <tr>
+   <td><code>IsSearchProviderInstalled(<em>descriptionURL)</em></code></td>
+   <td colspan="2">Indicates if a specific search provider (OpenSearch) is installed.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Specification" name="Specification">Specification</h2>
+
+<p>Mozilla-specific. Not part of any standard.</p>