Objective I am trying to hide an element using Temper Monkey user script The testing webpage is https://www.dmla5.com/play/8733-1-5.html. After clicking the pink button, a video will be loaded. My goal is to hide the progress bar below the video. Simplified version that sums up the objective document.getElementsByClassName(“leleplayer-bar”)[0].hidden = true; Code The element is loaded after […]