Headed mode is a way that you can run brousers without having it pop up on the screen and render all that stuff. It will still do the rendering, it just won't graphically display that to you. When headless modes first became popular, i want to say, about five years ago, like it really became popular fantom j s,. Then cro basically came along, did the same thing and killed a chance project. Also, if you try to do head headed mode and certain c i tools or go actions, sometimes you might get these walk errors, like, you couldn't render this thing.