What is the problem with using a webpage when using a browser other than Internet Explorer? Do you want to see the page with Firefox, without switching the browser? Now you can
User Agent Switcher is a Firefox extension that helps you masquerade Mozilla browser as Internet explorer, Opera, or any other browser.
The main advantage is that you will be able to access pages that allow access only through Internet Explorer, which still continues.
If you want to see a page correctly using a specific browser, do not want to leave Firefox, but the solution that you are looking for is the user agent switcher.