FF-Addon-Snippet-Load-Context-And-Goodies.js

function loadContextAndGoodies(request, return_goodies) {
  var loadContext = null;
  
  if (request instanceof Ci.nsIRequest) {
      try {
          if (request.loadGroup && request.loadGroup.notificationCallbacks) {
              loadContext = request.loadGroup.notificationCallbacks.getInterface(Ci.nsILoadContext);
          }
      } catch (ex) {
        console.exception('request loadGroup with notificationCallbacks but oculd not get nsIloadContext', ex);
      }
      if (!loadContext) {
        try {
            if (request.notificationCallbacks) {
                loadContext = request.notificationCallbacks.getInterface(Ci.nsILoadContext);
            }
        } catch (ex) {
          console.exception('request has notificationCallbacks but could not get nsILoadContext', ex);
          /* start - noit's backup try, it might be redundant (im not sure) as Wladamir Palant didn't have this way*/
          try {
            var interfaceRequestor = httpChannel.notificationCallbacks.QueryInterface(Ci.nsIInterfaceRequestor);
            loadContext = interfaceRequestor.getInterface(Ci.nsILoadContext);
          } catch (ex) {
            console.exception('backup method failed:' ex);
          }
          /* end - my backup try, it might be redundant as Wladamir Palant didn't have this way*/
        }
      }
  } else {
    console.warn('request argument is not instance of nsIRequest')
  }
  
  if (return_goodies) {
    if (!loadContext) {
      return null;
    }
    
    var contentWindow = loadContext.associatedWindow;
    var DOMWindow = contentWindow.top.QueryInterface(Ci.nsIInterfaceRequestor)
                                     .getInterface(Ci.nsIWebNavigation)
                                     .QueryInterface(Ci.nsIDocShellTreeItem)
                                     .rootTreeItem
                                     .QueryInterface(Ci.nsIInterfaceRequestor)
                                     .getInterface(Ci.nsIDOMWindow);
    var gBrowser = DOMWindow.gBrowser;
    if (gBrowser._getTabForContentWindow(contentWindow.top)) {
      var tab = gBrowser._getTabForContentWindow(contentWindow.top);
      var browser = tab.linkedBrowser;
    } else {
      var tab, browser = null;
    }
    var goodies = {
      loadContext: loadContext,
      DOMWindow: DOMWindow,
      gBrowser: gBrowser,
      contentWindow: contentWindow,
      browser: browser,
      tab: tab
    };
    
    return goodies;
  } else {
    return loadContext;
  }
}