They can require ID verification of all users, as is done in some states in the US to access pornography sites.

Haven’t played it in years, but really liked it. Probably have hundreds of hours in it. I really liked a Star Trek total conversion too.

The page uses canvas, and Librewolf blocks some canvas functionality by default for privacy reasons. You should see a little icon to the left of the url that you can click to allow the site to run correctly.