title: JSONP request in chrome extension, callback function doesn't exist?
body: <p>I am making a JSONP request in a chrome extension (content script) . Everything works very well when I am running as a webpage -loading the HTML file in my browser-, but when I load it as a chrome extension, the jsonp callback function created by jquery doesn't seem to exist when the server gives its response.</p>
  
  <p>My console says:</p>
  
  <pre><code>Uncaught ReferenceError: jQuery17105683612572029233_1323808231542 is not defined
  </code></pre>
  
  <p>Here is my ajax request:</p>
  
  <pre><code>$.ajax({
      url: 'http://example.com',
      data: 
      {
          imgUrl: this.href,
          returnString:true
      },
      dataType: "jsonp",
      success: function(msg){
          newNode.src = msg.data;
      },
      error: function(msg){
          console.log(msg.data);
      }
  })
  </code></pre>