https://blog.offline-net.com/2010/05/09/opera-firefoxmozless%e9%a2%a8%e3%82%ad%e3%83%bc%e3%83%90%e3%82%a4%e3%83%b3%e3%83%89%e3%81%ab%e5%a4%89%e6%9b%b4windows-linux/