A Greasemonkey script to display ACF field names next to their labels on WordPress Admin (read more: https://www.gsarigiannidis.gr/quickly-view-an-acf-field-s-name-on-wordpress-admin/)

Show ACF field names in WordPress Admin

// ==UserScript==
// @name Show ACF field names in WP Admin
// @match http://*/wp-admin/*
// @match https://*/wp-admin/*
// @match http://*/*/wp-admin/*
// @match https://*/*/wp-admin/*
// @version  1
// @grant    none
// ==/UserScript==

var field = document.querySelectorAll('.acf-field'),
    i;

if(field.length) {
  for (i = 0; i < field.length; i++) {
    var thisField = field[i],
        fieldName = thisField.dataset.name,
        fieldLabel = document.createElement('span');
    fieldLabel.style.cssText = 'color:#999;font-weight:normal;';
    fieldLabel.innerHTML = ' [' + fieldName + ']';
        thisField.querySelector('.acf-label label').appendChild(fieldLabel);
  }
}