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+---
+title: manifest_version
+slug: Mozilla/Add-ons/WebExtensions/manifest.json/manifest_version
+tags:
+  - Add-ons
+  - Extensions
+  - WebExtensions
+translation_of: Mozilla/Add-ons/WebExtensions/manifest.json/manifest_version
+---
+<p>{{AddonSidebar}}</p>
+
+<table class="fullwidth-table standard-table">
+ <tbody>
+  <tr>
+   <th scope="row" style="width: 30%;">型</th>
+   <td><code>Number</code></td>
+  </tr>
+  <tr>
+   <th scope="row">必須</th>
+   <td>はい</td>
+  </tr>
+  <tr>
+   <th scope="row">例</th>
+   <td>
+    <pre class="brush: json">
+"manifest_version": 2</pre>
+   </td>
+  </tr>
+ </tbody>
+</table>
+
+<p>このキーは、拡張機能で使用される manifest.json のバージョンを指定します。</p>
+
+<p>現在、この値は常に 2 です。</p>
+
+<h2 id="例">例</h2>
+
+<pre class="brush: json no-line-numbers">"manifest_version": 2
+</pre>
+
+<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.manifest.manifest_version")}}</p>