remove all fb members.js

// removes your box from the page so you don't get removed from the group
$$('[data-name=GroupProfileGridItem]')[0].remove();
 
// member action dropdowns
const actions = $$('.adminActions');
 
// open all dropdowns so they're added to the DOM
for (var i = 0; i < actions.length; i++) {
  $$('.adminActions button')[i] && $$('.adminActions button')[i].click();
}
 
// leave group buttons
const buttons = $$('[data-testid=leave_group]');

var i = 0;

function removeAll() {
  setTimeout(function () {
    // click each button
    buttons[i].click();
    // click confirm button with a half second delay
    setTimeout(function() {
      document.getElementsByClassName('layerConfirm')[0].click() 
    }, 500);
    i++;
    if (i < buttons.length) {
      // each time this is called, there will be a 3 second delay
      removeAll();
    }
  }, 3000);
}

removeAll();