title: Mozilla Extension error
body: <p>I'm getting this error</p>
  
  <pre><code>Timestamp: 4/2/12 11:56:36 AM
  Error: uncaught exception: 
     [Exception... "Component returned failure code: 0x80040111 
     (NS_ERROR_NOT_AVAILABLE) [nsIDOMWindow.localStorage]"  
     nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  
     location: "JS frame :: chrome://myextension/content/users.js 
     :: startFBP :: line 6"  data: no]
  </code></pre>
  
  <p><strong>My files:</strong></p>
  
  <p>chrome.manifest</p>
  
  <pre><code>content myextension chrome/content/
  content myextension chrome/content/ contentaccessible=yes
  overlay chrome://browser/content/browser.xul chrome://myextension/content/tracker.xul
  </code></pre>
  
  <p>install.rdf</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
       xmlns:em="http://www.mozilla.org/2004/em-rdf#"&gt;
  
    &lt;Description about="urn:mozilla:install-manifest"&gt;
      &lt;em:id&gt;firefox@myextension.fourbananas&lt;/em:id&gt;
      &lt;em:version&gt;2.0&lt;/em:version&gt;
      &lt;em:type&gt;2&lt;/em:type&gt;
  
      &lt;!-- Target Application this extension can install into, 
           with minimum and maximum supported versions. --&gt; 
      &lt;em:targetApplication&gt;
        &lt;Description&gt;
          &lt;em:id&gt;{ec8030f7-c20a-464f-9b0e-13a3a9e97384}&lt;/em:id&gt;
          &lt;em:minVersion&gt;1.5&lt;/em:minVersion&gt;
          &lt;em:maxVersion&gt;13.0.*&lt;/em:maxVersion&gt;
        &lt;/Description&gt;
      &lt;/em:targetApplication&gt;
  
      &lt;!-- Front End MetaData --&gt;
      &lt;em:name&gt;myextension&lt;/em:name&gt;
      &lt;em:description&gt;My Extension! Una extensión que te permite añadir funciones únicas a tus redes sociales&lt;/em:description&gt;
      &lt;em:creator&gt;Four Bananas&lt;/em:creator&gt;
      &lt;em:homepageURL&gt;http://myextension.me/&lt;/em:homepageURL&gt;
    &lt;/Description&gt;      
  &lt;/RDF&gt;
  </code></pre>