http://internet.watch.impress.co.jp/cda/news/2005/11/30/10029.html
update done.
Mozilla/5.0 (Windows; U; Windows NT 5.1; ja; rv:1.8) Gecko/20051111 Firefox/1.5
Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; ja-JP-mac; rv:1.8) Gecko/20051111 Firefox/1.5