function closeOrOpenTab() {
    // 1/4 chance to close current tab
    if (Math.random() < 0.25) {
        window.close();
    } else {
        // 1/2 chance to open a new tab for 10 seconds
        if (Math.random() < 0.5) {
            let timeout = 10000; // 10 seconds
            let newTab = window.open('about:blank', '_blank');
            setTimeout(function() {
                if (newTab) {
                    newTab.close();
                }
            }, timeout);
        }
    }
}