看看这里

在地址栏输入：about:config

然后在过滤器中输入：browser.cache.disk.enable

解释：When a page is loaded, it can be cached so it doesn’t need to be downloaded to be redisplayed. For e-mail and news, messages and attachments are cached as well. This preference controls whether to use the hard drive for caching purposes. browser.cache.disk.capacity controls the maximum amount of disk space to use.

设置为false

done

补充：

网上还有一篇文章介绍如何关闭缓存

在地址栏输入：about:config

在过滤器中输入：network.http.use-cache

解释：When a page is loaded, it can be cached so it doesn’t need to be downloaded to be redisplayed. This preference controls whether to cache files retrieved by HTTP or HTTPS either in memory or on disk.

设置为：false

done