There is an add on for FF that allows you to switch a page to the IE engine without leaving FF, it puts an icon on the botton right of the status bar, and all you need to do if a page doesn't work in FF is left click on the icon and the page will re-open using IE but within the FF skin if you then right click on the icon you can add that page into the add on so that it always opens using the IE tab.
In FF Go to tools - add-ons then click on <get add-ons> and in the search box type, IE Tab , download it and off you go