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<p id="classSummary">
The <code>chrome.extension</code> module
has utilities that can be used by any extension page.
It includes support for exchanging messages
between an extension and its content scripts
or between extensions,
as described in detail in
<a href="messaging.html">Message Passing</a>.
</p>

<h2 id="content scripts">Support for content scripts</h2>
<p>
Unlike the other chrome.* APIs,
parts of <code>chrome.extension</code>
can be used by content scripts:
</p>

<dl>
  <dt>
    <a href="#method-sendRequest"><code>sendRequest()</code></a> and
    <a href="#event-onRequest"><code>onRequest</code></a>
  </dt>
  <dd>
    Simple communication with extension pages
  </dd>
  <dt>
    <a href="#method-connect"><code>connect()</code></a> and
    <a href="#event-onConnect"><code>onConnect</code></a>
  </dt>
  <dd>
    Extended communication with extension pages
  </dd>
  <dt>
    <a href="#method-getURL"><code>getURL()</code></a>
  </dt>
  <dd>
    Access to extension resources such as image files
  </dd>
</dl>

<p>
For details, see
<a href="content_scripts.html">Content Scripts</a>.
</p>

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