Occassionally, you might want to run the IE browser too. Many banking and financial websites allow you to enter their secure website only if you use IE (They think it is the safest browser, HA HA HA). Switching between both of them will be a pain. Why not run IE within Firefox? If that sounds interesting, this plugin is for you. It allows you to switch between Gecko and IE rendering engines with a single click a la Netscape. Go get it while it is hot.