“替代”的方法是什么；“远程地址”；FireFox中的头文件？

在谷歌浏览器中有一个标题叫做“远程地址”。 我正在为Firefox编写一个插件，我需要根据远程主机来决定一些事情，但Firefox中似乎没有这样的头。 如果您知道如何从observer对象访问远程主机，请告诉我

observe : function(aSubject, aTopic, aData) {
    //I need remote host here
}

她是谷歌chrome中标题的屏幕截图

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如果标题不在那里，它会抛出异常

NS\u ERROR\u not\u AVAILABLE

var {classes: Cc, interfaces: Ci, utils: Cu} = Components;
Cu.import('resource://gre/modules/Services.jsm');

var httpRequestObserver =
{
    observe: function(subject, topic, data)
    {
        var httpChannel, requestURL;
        httpChannel = subject.QueryInterface(Ci.nsIHttpChannel);
        requestURL = httpChannel.URI.spec;

        if (topic == "http-on-modify-request") {

            //if (requestURL.indexOf('google.com') > -1) {
                //httpChannel.setRequestHeader('MyCustomRequestHeader', 'hiiii', false);
                try {
                   var Host = httpChannel.getRequestHeader('Host');
                } catch (ex) {
                    var Host = 'NULL';
                }
                console.log('REQUEST Header "Host" = ' + Host);
            //}
        } else if (topic == "http-on-examine-response") {
            try {
               var Host = httpChannel.getResponseHeader('Host');
            } catch (ex) {
                var Host = 'NULL';
            }
            console.log('RESPONSE Header "Host" = ' + Host);
        }
    }
};

Services.obs.addObserver(httpRequestObserver, "http-on-modify-request", false);
Services.obs.addObserver(httpRequestObserver, "http-on-examine-response", false);
//Services.obs.removeObserver(httpRequestObserver, "http-on-modify-request", false); //run this on shudown of your addon otherwise the observer stags registerd
//Services.obs.removeObserver(httpRequestObserver, "http-on-examine-response", false); //run this on shudown of your addon otherwise the observer stags registerd

用于制作此代码段的有用文章：

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我无法帮助您了解远程地址，但我是否应该向您展示如何与您的观察者一起获取请求和响应标题？是的，这也会很有帮助，至少让我更接近我所寻找的内容。