failed to launch firefox after upgrading last weekend

I was able to launch firefox on my 4.9-stable box and show it on my 5.2-current
but after cvsup and upgrading my -current last weekend, I cannot launch firefox
anymore

here's my system information :

R40 [/home/ijliao] -ijliao- uname -a
FreeBSD R40 5.2-CURRENT FreeBSD 5.2-CURRENT #11: Thu Mar  4 17:16:21 CST 2004     root_at_R40:/usr/obj/usr/src/sys/R40  i386

FreeBSD [/home/ijliao] -ijliao- uname -a
FreeBSD FreeBSD 4.9-STABLE FreeBSD 4.9-STABLE #8: Wed Oct 29 10:04:27 CST 2003     root_at_FreeBSD:/usr/obj/usr/src/sys/FREEBSD  i386

here's my command :

R40 [/home/ijliao] -ijliao- ssh -2 -f -X freebsd firefox

and here's the error message :

R40 [/home/ijliao] -ijliao- The program 'firefox-bin' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadAtom (invalid Atom parameter)'.
  (Details: serial 121 error_code 5 request_code 20 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
-- 
int i;main(){for(;i["]<i;++i){--i;}"];read('-'-'-',i+++"hell\
o, world!\n",'/'/'/'));}read(j,i,p){write(j/p+p,i---j,i/i);}
					-- IOCCC 1984