title: Can I run my own javascript on a (loaded) page?
body: <p>Can I run my own javascript code in a browser when viewing a page?</p>
  
  <p>For example I have page index.html. In that I want to run this javascript function</p>
  
  <pre><code>function myFunction()
  {
  
   alert("Say Hi");
  
  }
  </code></pre>
  
  <p>I want to call this function through some browser interface because I don't have access to the source code of the web.</p>