https://qooah.com/2012/07/06/mozilla-%e9%96%8b%e7%99%bc%e8%80%85%e5%b1%95%e7%a4%ba-firefox-os-%e7%9a%84%e9%8e%96%e5%b1%8f%e7%95%8c%e9%9d%a2/