title: Navigator.plugins does not display all plugins
body: <p>I was working on detection of adblock plugin on a web browser and i noticed that </p>
  
  <pre><code>navigator.plugins  
  </code></pre>
  
  <p>returns an array of <code>PluginArray</code> object with a list of plugins installed.</p>
  
  <pre><code>Java Applet Plug-in
  Shockwave Flash
  Picasa
  QuickTime Plug-in
  </code></pre>
  
  <p>But unexpectedly it does not return all plugins, plugins such as "<strong>User Agent Switcher</strong>" and "<strong>Adblock</strong>" were not listed (contrary to what is stated in <a href="https://developer.mozilla.org/en-US/docs/Web/API/NavigatorPlugins.plugins" rel="nofollow">https://developer.mozilla.org/en-US/docs/Web/API/NavigatorPlugins.plugins</a>). </p>
  
  <p>Why does it not display all plugins (am i missing something) or how do i display all plugins?</p>