Triggering an event, confirming it happened with mutationobserver, triggering it again when ready.

gistfile1.js

var i = 3; //number of times you'll want to run task (three clicks, in this example)

var observer = new MutationObserver(function(mutations) {
  mutations.forEach(function(mutation) {

    //Was this an event that made the list grow?
    if (mutation.type === 'childList') {
      i--; //then count it as an iteration
    }

    //Got more iterations to go? On to the next one! click again!
    if (i > 0){
     document.querySelector('.load-more-text').click();
    }

  });
});

//what we'll be observing, in this case, seeing a list (that has class 'channels-browse-content-grid')  of DOM nodes grow
var config = { attributes: false,
      childList: true,
      characterData: false,
      subtree: false };
observer.observe(document.querySelector('.channels-browse-content-grid'), config);

//start it off. do the action that will trigger the list growing (click on a button which ajax fetches something and populates the list you specified)
document.querySelector('.load-more-text').click();