Turn off/disable YouTube autoplay feature

disable_youtube_autoplay.js

// To run, install GreaseMonkey or TamperMonkey extension in your browser
// Copy this code into new user script, and enable

// ==UserScript==
// @name         Disable Youtube autoplay
// @version      1.0
// @description  This script turns off Youtube's newest autoplay feature after the page loads
// @author       Jeff Bellucci
// @match        *://www.youtube.com/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    function uncheck(toggle) {
        if (toggle.hasAttribute('checked')) {
            toggle.click();
        }
    }           
                   
    function disableAfterLoad() {
        var autoplayToggle = document.getElementById('toggle');
        if (autoplayToggle) {
            uncheck(autoplayToggle);
        } else {
            setTimeout(disableAfterLoad, 500);
        }
    }

    disableAfterLoad();
})();

@S3NTYN3L
It finally stopped working for me as well. @konomikitten's script works wonderfully.
But the mutationObserver freaks out on my side, so I replaced it with setInterval every 1 second instead and stops the script once it detects that the autoplay next has been disabled.

Here's a shortened working script that only disables autoplay next with setInterval, nothing else.

var var_interval_id = window.setInterval( function( window ) {
    let a = window.document.querySelector( "button.ytp-button[data-tooltip-target-id='ytp-autonav-toggle-button']" ); // get the button
    if ( a.getAttribute( "aria-label" ) == "Autoplay is on" ) {
        a.click( ); // disable autoplay next if enabled
    }
    if ( a.getAttribute( "aria-label" ) == "Autoplay is off" ) {
        window.clearInterval( var_interval_id ); // end script once done
    }
}, 1024, window );

Thanks for the code.
But how can I make a web extension in which I can toggle the autoplay button on and off?

I have the old background.js and the script.js
I also have a "jquery-3.2.1.min.js" but I don't know what this script does.

Please help!

@JohnyP36 You need to use a script running extension. Personally, I prefer Tampermonkey, but there are a number of options out there that let you save different scripts and run them as you see fit, on a single website, on all websites, on document ready, etc, etc. They are quite powerful.

I have forked and modded this userscript due to youtube breaking stuff (You refresh the page, autoplay goes back on even if you turn it off). The autoplay got moved into html5 player, and the only way I can do it is with JQuery. My version would not allow autoplay to be turned on, it'll turn off again because of youtube bug above.

So, is there still a workable JS script as of the present?

@scrutinizer11 this one works for me https://gist.githubusercontent.com/sidneys/02a9025ae1f23aefe1f4ea02e78b0ac8/