You realize that 1) the website is critical to the NSO group, and 2) you can have more than one separate/independent browser session on your computer to browser stuff on your computer?
Forensic architecture is known for years to make visually fancy stuff (e.g. the films and exhibitions which they show for roughly the past decade in the art context throughout Europe, for example at the last Documenta). For them to develope a website that uses a lot of javascript is somewhat ironic, but not surprising.