Like multiple Facebook comments at once

// To like all comments on a Facebook page by an author's name. Run this in the developer console. (Select View > Developer > JavaScript Console)
var author = 'John Doe';
var comments = document.getElementsByClassName("UFIComment");
for (var i = 0; i < comments.length; i++) {
    if (comments[i].getElementsByClassName("UFICommentActorName")[0].childNodes[0].innerHTML == author) {
        var link = comments[i].getElementsByClassName("UFILikeLink")[0];
        link.click();
    }
}

// to undo
var author = 'John Doe';
var comments = document.getElementsByClassName("UFIComment");
for (var i = 0; i < comments.length; i++) {
    if (comments[i].getElementsByClassName("UFICommentActorName")[0].childNodes[0].innerHTML == author) {
        var link = comments[i].getElementsByClassName("UFILikeLink")[0];
        if (link.innerHTML == 'Unlike') {
            link.click();
        }
    }
}

// count comments
var obj = {};
var comments = document.getElementsByClassName("UFIComment");
var i = 0;
for (; i < comments.length; i++) {
    var author = comments[i].getElementsByClassName("UFICommentActorName")[0].childNodes[0].innerHTML;
    if (author in obj) {
        obj[author]++;
    } else {
        obj[author] = 1;
    }
}
console.log(obj);