如何关闭Firefox的not secure安全提醒

如图 ，公司要求在LAN Settings里设置公司的代理才能上外网，估计是这个代理服务器证书导致的。

每次访问https的网站都会有这个not secure的提示，而且有的网站有HSTS，都不能添加例外。

请教如何关闭这一提示？谢谢！

Your connection is not secure
The owner of www.baidu.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.
This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate.
Learn more…

谢谢LS，我从IE里导出了根证书，导入到fx里就解决了。