Apart from the 'thou shalt not install anything on pain of death' rule... I'd give it a go. (Or Opera for that matter.)
Then again, I use my own Telnet client (as the only supplied one is Microsoft Telnet)
/me looks around, noticing the office is completely empty. Then dashes off the Mozilla...
Ooh, how did that happen? I just slipped on the mouse and... download in progress :)