The problem was originally reported in Japanese bugzilla, http://bugzilla.mozilla.gr.jp/. Two cases are reported. 1) Crashes when selecting Japanese encodings. 2) If not carsh, Japanese characters are over wrapped since singble-byte character width is applied to double-byte characters.
The first bug is a dup of bug 49670.
Please check this on the latest build. we have DBCS working as well as character set.
Latest build is at: ftp://ftp.software.ibm.com/ps/products/warpzilla
These are both fixed. Marking fixed