https://blog.wongcw.com/2021/10/06/firefox-focus%e8%bf%8e%e4%be%86%e9%87%8d%e5%a4%a7%e6%9b%b4%e6%96%b0-%e7%8d%b2%e5%be%97%e6%96%b0%e7%9a%84logo%e3%80%81%e5%bf%ab%e6%8d%b7%e6%96%b9%e5%bc%8f%e3%80%81%e9%bb%91%e6%9a%97%e4%b8%bb%e9%a1%8c/