Highcharts.chart('container', {
    chart: {
        type: 'pie'
    },
    title: {
        text: 'Connectorline is not visible, with setting connectorWidth to zero'
    },
    plotOptions: {
        pie: {
            dataLabels: {
                connectorWidth: 0
            }
        }
    },

    series: [{
        data: [
            ['Firefox',   44.2],
            ['IE7',       26.6],
            ['IE6',       20],
            ['Chrome',    3.1],
            ['Other',    5.4]
        ]
    }]
});