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If your XIM wouldn't work propery, try to make a file
"${HOME}/.mozilla/${USER}/*.slt/user.js"
with below content;
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user_pref("xim.input_style", "over-the-spot")
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If need printing, go /usr/ports/chinese/arphicttf to make WANT_GS6=yes
Then go /usr/ports/chinese/ghostscript6 to make all install
Check http://freebsd.sinica.edu.tw/~statue/zh-tut/web-browse.html for detail
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