The ko locale messages was committed to Firefox 1.1 l10n(localization) trunk on cvs.mozllla.org. Now Deer Park Alpha1 was released to prepare Firefox 1.1 version. It was assisted by Mr. Jungkun Kim, a peer of Thunderbird Korean. So there will be four CVS committers in Korea, Mr. Jungshin Sin, Mr. Junho Choi, Mr. Channy Yun and Mr. Jungkyun Kim.
You can see Firefox 1.1 l10n Status, Thunderbird 1.1 l10n Status and Tinderbox Fx/Tb 1.1 build status of ko locale. And you can download Firefox 1.1 l10n nightly build and Thunderbird 1.1 l10n nightly build
Many users give a comment about mistranslation and misspelling in community forum.