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+---
+title: tabs.duplicate()
+slug: Mozilla/Add-ons/WebExtensions/API/tabs/duplicate
+translation_of: Mozilla/Add-ons/WebExtensions/API/tabs/duplicate
+---
+<div>{{AddonSidebar()}}</div>
+
+<p>ID で指定されたタブを複製します。</p>
+
+<p>この関数は <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a></code> を返す非同期関数です。</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox brush:js">var duplicating = browser.tabs.duplicate(
+  tabId              // integer
+)
+</pre>
+
+<h3 id="パラメータ">パラメータ</h3>
+
+<dl>
+ <dt><code>tabId</code></dt>
+ <dd><code>integer</code>. 複製するタブのIDを指定します。</dd>
+</dl>
+
+<h3 id="戻り値">戻り値</h3>
+
+<p>A <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">Promise</a></code> that will be fulfilled with a {{WebExtAPIRef('tabs.Tab')}} object containing details about the duplicated tab. The <code>Tab</code> object only contains <code>url</code>, <code>title</code> and <code>favIconUrl</code> if the extension has the <a href="/en-US/Add-ons/WebExtensions/manifest.json/permissions"><code>"tabs"</code> permission</a>. If any error occurs the promise will be rejected with an error message.</p>
+
+<h2 id="ブラウザ実装状況">ブラウザ実装状況</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("webextensions.api.tabs.duplicate")}}</p>
+
+<h2 id="例">例</h2>
+
+<p>１つ目のタブを複製し、新しく作られたタブのIDをログに残す例：</p>
+
+<pre class="brush: js">function onDuplicated(tabInfo) {
+  console.log(tabInfo.id);
+}
+
+function onError(error) {
+  console.log(`Error: ${error}`);
+}
+
+// Duplicate the first tab in the array
+function duplicateFirstTab(tabs) {console.log(tabs);
+  if (tabs.length &gt; 0) {
+    var duplicating = browser.tabs.duplicate(tabs[0].id);
+    duplicating.then(onDuplicated, onError);
+  }
+}
+
+// Query for all open tabs
+var querying = browser.tabs.query({});
+querying.then(duplicateFirstTab, onError);</pre>
+
+<p>{{WebExtExamples}}</p>
+
+<div class="note"><strong>謝辞</strong>
+
+<p>この API は Chromiums の <a href="https://developer.chrome.com/extensions/tabs#method-duplicate"><code>chrome.tabs</code></a> APIに基づいています。 This documentation is derived from <a href="https://chromium.googlesource.com/chromium/src/+/master/chrome/common/extensions/api/tabs.json"><code>tabs.json</code></a> in the Chromium code.</p>
+
+<p>Microsoft Edge での実装状況は Microsoft Corporation から提供されたものであり、ここでは Creative Commons Attribution 3.0 United States License に従っています。</p>
+</div>
+
+<div class="hidden">
+<pre>// Copyright 2015 The Chromium Authors. All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+</pre>
+</div>