index.js

function eventFire(el, etype){
  if (el.fireEvent) {
    el.fireEvent('on' + etype);
  } else {
    var evObj = document.createEvent('Events');
    evObj.initEvent(etype, true, false);
    el.dispatchEvent(evObj);
  }
}

for(var i=0; i < 100; i++){
  (function(ind) {
    // click the option menu
    setTimeout(() => {
    var opt = document.getElementsByClassName('wpO6b')[1]

    eventFire(opt, 'click');
    console.log('clicked!!!')
    }, 4000 + (3000 * ind))

    // click the del btn
    setTimeout(() => {
      var del = document.getElementsByClassName('aOOlW')[0]
      eventFire(del, 'click');
      console.log('delete btn clicked')
    }, 6000 + (3000 * ind))

    // click the confirmation
    setTimeout(() => {
      var del = document.getElementsByClassName('aOOlW')[0]
      eventFire(del, 'click');
      console.log('deleted')
    }, 7000 + (3000 * ind))

    // click the post once again
    setTimeout(() => {
      var firstPost = document.getElementsByTagName('a')[7]
      eventFire(firstPost, 'click');
      console.log('clicked again')
    }, 9000 + (3000 * ind))
  })(i)
}