hn-next-button.js

// Use something like https://caiorss.github.io/bookmarklet-maker/ to convert this to a bookmarklet

// clicks the first visible 'next' button on https://news.ycombinator.com/
let x = () => {
    let content_filter = link => link.textContent.includes('next');
    let visibility_filter = link => (link.getBoundingClientRect().top >= 0 && link.getBoundingClientRect().bottom <= window.innerHeight);

    let fuse = 'on';

    document.querySelectorAll('a.clicky').forEach(link => {
        if (content_filter(link) && visibility_filter(link) && fuse === 'on') {
            link.click();
            fuse = 'off';
        }
        
    })

    if (fuse === 'on') {
        console.log("no 'next' buttons visible on page");
        Notification.requestPermission().then(
            _ => alert ("no 'next' buttons visible on page")
        )
    }
}; 

x();