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https://ja.hideki.hclippr.com/2008/03/21/firefox-3-0b4%e3%81%afb3%e3%82%88%e3%82%8a%e3%82%82%e4%b8%8d%e5%ae%89%e5%ae%9a%e3%81%8b%e3%82%82/
Firefox 3.0b4はb3よりも不安定かも