Firefox 59 引入的网页加载优化特性，通过同时尝试从缓存和网络获取资源来提升页面加载速度。
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这个特性是在 Firefox 59 就启用的，一直没有多少资料。这里我找到一篇 ppt。http://slides.com/valentingosu/race-cache-with-network-2017/fullscreen#/
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