title: chrome.extension.getBackgroundPage not working on Opera 16
body: <p>I have an extension for Chrome that was working fine on Opera 15 (and works fine on Chrome 29).</p>
  
  <p>Stating with Chrome 16, I get this error:</p>
  
  <p>Uncaught TypeError: Cannot call method 'getBackgroundPage' of undefined </p>
  
  <p>Spefically, chrome.extension is undefined.</p>
  
  <p>The code in question is:</p>
  
  <p>function _getBackgroundPage()
  {
    return chrome.extension.getBackgroundPage();
  }</p>
  
  <p>Did something change or break in Opera 16?</p>
  
  <p>The add-on is here:</p>
  
  <p><a href="https://chrome.google.com/webstore/detail/webde-mailcheck/jaogepninmlbinccpbiakcgiolijlllo?hl=en" rel="nofollow">https://chrome.google.com/webstore/detail/webde-mailcheck/jaogepninmlbinccpbiakcgiolijlllo?hl=en</a></p>
  
  <p>And the error occurs when going to Options and clicking "Add..." to add a new account.</p>
  
  <p>At the core, the problems seems to be loading a chrome URL into an iframe (on another chrome page). This is allowed in Opera 15 but it broke in Opera 16.</p>