That sounds like an LoL company. Lots of Lawyers.
Does it accept for the session and dump on log out or is just set to reject?
Your solution would be a portable app run from a usb stick
There are a collection of browsers that run from usb. you have complete control and it saves whatever you tell it to.
Most of them are free. here's a google search showing some
https://www.google.com/search?q=portable+usb+browsers