When using NoScript Firefox Extension the cern login page does not work as expected and an Cross Side Scripting attach is detected, NoScript stops working...
There is a workaround provided at the Cern TWiki, just found it using google in an Cern Computing Newsletter, seems that more people than me have the same problem;)
https://twiki.cern.ch/twiki//bin/view/LinuxSupport/NoScriptProblems
PS: I hate being forced to use IE;)
Another helpful thread is on how to setup a Scientific Linux on a VMWare...
Still there are not many details written, will be added.