Firefox Inside Firefox

                                                   Yes, Firefox inside Firefox. That means you can return Firefox inside Firefox just  type
a url.  And its really easy too just type in this url in Firefox's address bar and there you go! Firefox inside Firefox!

                                                    Copy paste the following url in Firefox Address bar:

                                                             chrome://browser/content/browser.xul

Following is the screenshot of this trick (firefox in firefox in firefox, which is again in another firefox)-
Picture