gecko-dev/suite/browser/viewsource.js

  function StartupViewSource() {
    // Generate unique name (var appCoreName declared in navigator.js).
    appCoreName = "ViewSource." + ( new Date() ).getTime().toString();
    
    // Create and initialize the browser app core.
    appCore = new BrowserAppCore();
    appCore.Init( appCoreName );
    appCore.setContentWindow(window.frames[0]);
    appCore.setWebShellWindow(window);
    appCore.setToolbarWindow(window);
    
    // Get url whose source to view.
    var url = document.getElementById("args").getAttribute("value");

    // Load the source (the app core will magically know what to do).
    appCore.loadUrl(url);
  }