title: how to run greasemonkey script before the page content is displayed?
body: <p>I am writing a plug-in for Firefox and using greasemonkey script to do that (I compile the user script using this tool <a href="http://arantius.com/misc/greasemonkey/script-compiler" rel="noreferrer">http://arantius.com/misc/greasemonkey/script-compiler</a>). </p>
  
  <p>The issue is that the script is run after the page is fully loaded. Meaning the user would see the viewed page in its original form and then the script will apply the changes that I made. My question is there a way to run the user script before the contents of the page is displayed to the user, so the user would only the final version of the website?</p>