title: What is the easiest way to inject a script in to someone else's domain?
body: <p>For example if I'm on www.facebook.com and I want to inject a script to analyze their DOM?  One way would be to open up the console and than use something like</p>
  
  <pre><code>document.createElement('script');
  </code></pre>
  
  <p>and then set the src attribute, etc.</p>
  
  <p>Is this the best way to do it?</p>