https://blog.wongcw.com/2018/11/06/firefox-65%e5%8d%b3%e5%b0%87%e6%b7%bb%e5%8a%a0%e5%b0%8dwebp%e6%a0%bc%e5%bc%8f%e5%9c%96%e7%89%87%e7%9a%84%e6%94%af%e6%8c%81%e9%99%84%e9%96%8b%e5%95%9f%e6%96%b9%e6%b3%95/