I tried to resign up for hosting, (which I hope you have to if you formerly had hosting :P) and it didn't work. I filled in all the boxes and hit enter, but then it told me that ILLEGAL EXECUTION DETECTED! and it was big red letters. :P
Well i tried it out myself Kingspore, and i didnt find any error. Maybe at that time some wrong code would have got executed. Please try again and check. It seems to be fine.
Well, i dont think it is something to do with the browsers, because i have personally tested it out with Internet explorer and Netscape and it works perfectly. And infact it might be working good enough even with firefox because as i have noticed many of the site members use firefox and i have already recieved more than 12 requests for hosting. May be there is some other problem on your end.