Firefox插件：从XMLHttpRequest获取选项卡

Question

我正在尝试使用以下代码将XMLHttpRequest与浏览器上的选项卡相关联：

function getBrowserFromChannel(aChannel) {
    var notificationCallbacks = 
        aChannel.notificationCallbacks ? 
                    aChannel.notificationCallbacks :
                    aChannel.loadGroup.notificationCallbacks;

    if (!notificationCallbacks) {
        console.log("no callbacks");
        return (0);
    }
    var loadContext = notificationCallbacks.getInterface(Ci.nsILoadContext);

getInterface（Ci.nsILoadContext）失败，并显示：“组件没有请求的接口”

知道我怎么能得到浏览器？

谢谢

Answer 1

试试这个代码（ 来自Lightbeam ）：

function getLoadContext(aRequest) {
    try {
        // first try the notification callbacks
        var loadContext = aRequest.QueryInterface(Ci.nsIChannel)
            .notificationCallbacks.getInterface(Ci.nsILoadContext);
        return loadContext;
    } catch (ex) {
        // fail over to trying the load group
        try {
            if (!aRequest.loadGroup) return null;

            var loadContext = aRequest.loadGroup.notificationCallbacks.getInterface(Ci.nsILoadContext);
            return loadContext;
        } catch (ex) {
            return null;
        }
    }
}

注意许可证是MPL 1.1 / GPL 2.0 / LGPL 2.1