Comment 12 for bug 502610

Copy from Bug 467979, (which has been marked as a duplication by Matthew)

This may be useful.

QianQian Fang 's comment.

This is the typical scenario where Japanese fonts overwrite Chinese fonts. The default fontconfig settings put Japanese fonts in front of Chinese fonts. Because Japanese fonts only cover a small fraction of Kanji, when rendering a block of simplified/traditional Chinese text, the missing ones will be rendered by Chinese fonts with full-coverage. I had proposed solutions to this issue, but the fontconfig developers are slow in responding:

https://bugzilla.redhat.com/show_bug.cgi?id=499902
http://bugs.freedesktop.org/show_bug.cgi?id=20911

if your firefox and other programs handle Chinese properly, then it must be webkit-based programs ignore some of the additional CJK specific fontconfig settings.