A couple of my good friends study at UniSIM, and they have been having problems accessing the site in Firefox.
A search in Google shows the following:
=\. Some more searching in Google shows the following:
Among many others. Just try search terms like “unisim attack site”, “unisim firefox problem”, etc.
I just hope that things will be fixed soon. Also, most of the forum posts, as well as my friends, have noted that while you will be able to access the site using Internet Explorer, their AVs (Avira, NOD32, among others) detected a virus on the site. Hopefully it’s just a false positive.