Batch follow from Twitter List https://twitter.com/i/lists/{id}/members

console.js

// Step 1
let nodes = Array.from(document.querySelectorAll('span span:not(:empty)')).filter(d => d.textContent != 'Remove');
for (const node of nodes) {
    node.dispatchEvent( new MouseEvent('mouseover', {
        bubbles: true,
        cancelable: true,
        view: window
    }));        
}

// Step 2
nodes = Array.from(document.querySelectorAll('[aria-label^="Follow @"]'));
let index = 0;

function followUser() {
    if (index >= nodes.length || index >= 30) {
        clearInterval(interval);
        return;
    }

    nodes[index].dispatchEvent(new MouseEvent('click', {
        bubbles: true,
        cancelable: true,
        view: window
    }));

    index++;
}

const SLEEP = 2000; // Set the desired interval between following users in milliseconds (2000 ms = 2 seconds)
let interval = setInterval(followUser, SLEEP);