title: Accessing content window not supported in multiprocess Firefox
body: <p>I'm using javascript and imacros to collect some data from a website and I have this line of code:</p>
  
  <p><code>final_macro += "ADD !EXTRACT " + '"' + lager_col2[0].textContent + '"' + "\n";</code></p>
  
  <p>When I ran my js in the browser I got this error:</p>
  
  <blockquote>
    <p>Error: Accessing content window is not supported in multiprocess Firefox, line 208 (Error code: -991)</p>
  </blockquote>
  
  <p>Should I be worried ? Is the use of <code>textContent</code> forbidden ? 
  The problem is that <code>lager_col2[0]</code> sometimes happen to be a link and I only want the text inside the link, not the tags and everything. So naturally I went with <code>textContent</code>. How could I get around this ?</p>
  
  <p>Additionally, am I setting myself up for trouble when trying to access certain nodes with the use of <code>window.document.getElementsByClassName</code>? 
  Is it better to use iMACROS TAG POS/XPATH ? </p>