Not necessarily. I've had instances where I would start filling out a form and it was incompatible in FF. So I had to start over in IE. Good thing for that extension that makes it easy to switch to IE.

You could probably use the work website with the FF extension that changes the user agent string that is sent when you request a webpage. You could set FF up to identify itself as Internet Explorer (poor FF ). I don't remember what the extension is called, though.