It shows as text here.
I'm not sure if this is a bug in FF or in MSIE, but is looks like the hader sent by the server makes it show the browser like plain text, although "<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">" was added.
If the server header says it is text, the browser must not pay attention to html tags (not even that content-type one), so it's just left as text.
I'm pretty sure MS inbuilt a detection for html pages ignoring the content-type header (that wouldn't be the first time MS ignore W3C guidelines). So it's probably a bug in MSIE that this is shown.
Anyway, that's a poorly coded script/site.
A Firefox bug? I have some serious doubts about that.