Don't use this extension unless you are in China.
在中国大陆，多数国外网页打不开或者加载很慢的原因是，网页里使用了 Google 的 CDN 提供的 javascript 库文件或者字体文件，包括很多大网站，比如 stackoverflow 和 dribbble，几乎所有 wordpress 博客。同样的文件在“360网站卫士常用前端公共库CDN服务” （http://libs.useso.com/）也有提供，这个扩展的工作原理就是，在浏览器将要请求 Google 提供的 js 文件时，把域名替换成 libs.useso.com。
比如 http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js?ver=3.4.2 被替换成了 http://ajax.useso.com/ajax/libs/jquery/1.7.2/jquery.min.js?ver=3.4.2，
http://fonts.googleapis.com/css?family=Open+Sans:300,400,600&subset=latin,latin-ext 被替换成了
http://fonts.useso.com/css?family=Open+Sans:300,400,600&subset=latin,latin-ext
另外将对 www.google.com/jsapi 的请求直接替换成了扩展本地文件内容 misc/jsapi.js。
这样解决了大部分由于使用了 Google 的 js 导致页面加载缓慢的情况。
有一点不完美的是 libs.useso.com 不支持 https，因此在 https 的情况下，换用了中科大的镜像 ajax.lug.ustc.edu.cn 和 fonts.lug.ustc.edu.cn。
在解决 https 问题时发现了 https://github.com/justjavac/ReplaceGoogleCDN/ 这个 repo 做的是同样的事情。不过都已经发布了，就这样吧。
图标来自 https://goo.gl/Xg80G6
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