ReferenceError：在Firefox中未定义函数

当我尝试在Firefox中加载此脚本时，它给了我这个错误：参考错误：未定义onListFriends。

该代码在Safari和Chrome中可以正常运行。

listFriends(onListFriends);

function onListFriends() {
    console.log("friends were listed.");
    setOnline();
}

这是稍后在文件中定义的listFriends函数：

function listFriends(callback) {
    FB.api(
        "me/friends",

    function (response) {
        console.log("Got FB.api response");
        var numOnline = 0;
        var numFriends = response.data.length;
        for (var i = 0; i < numFriends; i++) {
            isOnline(i, response.data, gotOnline);
            var callbackInc = 0;

            function callbackIfYouCan(callback) {
                callbackInc++;
                if (callbackInc == numFriends) {
                    interiorCallback(callback);
                }
            }

            function gotOnline(res, ind, data) {
                console.log("Got response from isOnline: " + res);
                var id = data[ind].id;
                var checkbox = document.createElement('input');
                checkbox.type = "checkbox";
                checkbox.name = "friends";
                checkbox.id = id;
                checkbox.value = data[ind].name;
                console.log("For user " + checkbox.value);
                var label = document.createElement('label');
                label.htmlFor = id;
                label.appendChild(document.createTextNode(data[ind].name));
                if (res == 1) {
                    document.getElementById("online").appendChild(checkbox);
                    document.getElementById("online").appendChild(label);
                    document.getElementById("online").appendChild(document.createElement('br'));
                    numOnline++;
                } else {
                    document.getElementById("offline").appendChild(checkbox);
                    document.getElementById("offline").appendChild(label);
                    document.getElementById("offline").appendChild(document.createElement('br'));
                }
                callbackIfYouCan(callback);
            }
        }

        function interiorCallback(callback) {
            if (numOnline > 0) {
                var textField = document.createElement('input');
                textField.setAttribute('type', 'text');
                textField.id = "message";
                textField.value = "I would like to hang out at this place in 15 minutes.";

                var button = document.createElement('button');
                button.setAttribute('type', 'button');
                console.log("Created tagging button.");
                button.onclick = function () {
                    console.log("Tagging button pressed.");
                    getIdsFromCheckboxes();
                }
                button.innerHTML = "Tag your friends.";

                document.getElementById("online").appendChild(textField);
                document.getElementById("online").appendChild(button);
            }
            callback();
        }
    });

}

Firefox和Chrome加载此代码的方式有什么区别？任何帮助，将不胜感激。