window._trackJs = {
    onError: function(payload, error) {

        function itemExistInList(item, list) {
            for (var i = 0; i < list.length; i++) {
                if (item.indexOf(list[i]) > -1) {
                    return true;
                }
            }
            return false;
        }

        var ignorableErrors = [
            // General script error, not actionable
            "[object Event]",
            // General script error, not actionable
            "Script error.",
            // an error caused by DealPly (http://www.dealply.com/) chrome extension
            "DealPly",
            // this error is reported when a post request returns error, i.e. html body
            // the details provided in this case are completely useless, thus discarded
            "Unexpected token <"
        ];

        if (itemExistInList(payload.message, ignorableErrors)) {
            return false;
        }

        payload.network = payload.network.filter(function(item) {

            // ignore random errors from Intercom
            if (item.statusCode === 403 && payload.message.indexOf("intercom") > -1) {
                return false;
            }

            return true;
        });

        return true;
    }
};

window._trackJs = {
    onError: function(payload, error) {

        function itemExistInList(item, list) {
            for (var i = 0; i < list.length; i++) {
                if (item.indexOf(list[i]) > -1) {
                    return true;
                }
            }
            return false;
        }

        var ignorableErrors = [
            // General script error, not actionable
            "[object Event]",
            // General script error, not actionable
            "Script error.",
            // error when user  interrupts script loading, nothing to fix
            "Error loading script",
            // an error caused by DealPly (http://www.dealply.com/) chrome extension
            "DealPly",
            // this error is reported when a post request returns error, i.e. html body
            // the details provided in this case are completely useless, thus discarded
            "Unexpected token <"
        ];

        if (itemExistInList(payload.message, ignorableErrors)) {
            return false;
        }

        payload.network = payload.network.filter(function(item) {

            // ignore random errors from Intercom
            if (item.statusCode === 403 && payload.message.indexOf("intercom") > -1) {
                return false;
            }

            return true;
        });

        return true;
    }
};

Add a general 'loading script' to ignore list