---
title: manifest_version
slug: Mozilla/Add-ons/WebExtensions/manifest.json/manifest_version
tags:
  - Add-ons
  - Extensions
  - WebExtensions
browser-compat: webextensions.manifest.manifest_version
---
{{AddonSidebar}}

<table class="fullwidth-table standard-table">
  <tbody>
    <tr>
      <th scope="row">Type</th>
      <td><code>Number</code></td>
    </tr>
    <tr>
      <th scope="row">Mandatory</th>
      <td>Yes</td>
    </tr>
    <tr>
      <th scope="row">Example</th>
      <td><pre class="brush: json">"manifest_version": 2</pre></td>
    </tr>
  </tbody>
</table>

This key specifies the version of manifest.json used by this extension.

Currently, this must always be 2.

## Example

```json
"manifest_version": 2
```

## Browser compatibility

{{Compat}}
