function saveSettings () {
    let data = {
        'groupEnable': groupEnable,
        'chainOption': chainOption,
    }
    localStorage.setItem('sllpSettings', JSON.stringify(data));
}

function loadSettings () {
    let data = localStorage.getItem('sllpSettings');
    if (data) {
        data = JSON.parse(data);
        groupEnable = data['groupEnable'];
        chainOption = data['chainOption'];
        if (!chainOption) {
            chainOption = 'none';
        }
    }
}

function clearSettings () {
    localStorage.removeItem('sllpSettings');
    location.reload();
}