This product requires Microsoft© Internet Explorer 6, Microsoft© Media Player 10, and Macromedia Flash 6. To download these free software applications, click the links below and follow the on-screen instructions. Step 1: Download Microsoft© Internet Explorer 6 Microsoft Internet Explorer 6 is free to download Once the installations are complete, reload this page.
Of course all of these are loaded on my machine, but they apparently don't work with Firefox at this website and I had to fire up IE6. Any suggestions from those more knowledgeable than me? (I don't plan on reloading anything if I can avoid it; must be some tweaks I can do without reloading).
There are two ways of incompatibility. One is fake, when they just detect for IE and kick you out or screw you up. As was mentioned, use the User Agent Switcher extension. Your browser will report itself to the Web site as IE, Opera, Firefox, etc. But please, after switching to IE, switch back to Firefox so you aren't over-reporting to sites the usage of IE, which will cut the reported marketshare of Firefox (this happened with Opera).
The other is when the site is actually incompatible with Firefox due to bad html/css or ActiveX. For that, use the IE Tab extension. It'll open a tab, but the insides are rendered with IE. You can configure it to always render certain domains with IE.