tell your admin he's an idiot :)
or better, don't tell him anything and install firefox without admin rights (not needed, you can install it to any directory without special rights)
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)