Show only not watched videos

//Script for showing only watched videos on YouTube - more info in here: https://webapps.stackexchange.com/a/112602/173146

//function to edit url query strings
function updateQueryStringParameter(uri, key, value) {
  var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
  var separator = uri.indexOf('?') !== -1 ? "&" : "?";
  if (uri.match(re)) {
    return uri.replace(re, '$1' + key + "=" + value + '$2');
  }
  else {
    return uri + separator + key + "=" + value;
  }
}

function deleteMore() {
    //search through all videos in playlist
    var elements = document.getElementsByClassName("pl-video yt-uix-tile");

    for(i=elements.length-1;i>=0;i--) {
        //check if there's a progress bar in the video (if it has you have watched it)
        children = elements[i].getElementsByClassName("resume-playback-progress-bar");
        if (children.length>0) {
            //delete it!
            elements[i].remove();
        }
    }

    if(document.querySelector('.load-more-button') != null){
        //scroll down
        window.scrollTo(0,document.body.scrollHeight);
        //click the load more button
        document.querySelector('.load-more-button').click();
        //redo it again
        setTimeout(function(){deleteMore()}, 500);
    } else {
        //in case there's no more load more button (looped through all videos)
        //change all links to remove the annoying playlist links
        var links = document.getElementsByTagName("A");
        for(i=links.length-1;i>=0;i--) {
            url = links[i].getAttribute('href');
            if (url!=null) {
                url = updateQueryStringParameter(url,'list','');
                links[i].setAttribute('href',url);
            }
        }

        console.log("... IS DONE! *metal riffs*");
    }
}

deleteMore();