onlyVideo.user.js

// ==UserScript==
// @name        only video
// @match       http://10livestreams.com/*
// @version     1.0.3
// @grant       none
// @namespace   https://gist.github.com/Mido22
// ==/UserScript==

(function(w, d){
  'use strict'

  w.addEventListener('load', () => {
		addButton('only video', keepOnlyVideo)
	})

	function keepOnlyVideo() {
		let v = d.getElementsByTagName('video')[0], p = d.body, cs = p.childNodes
    if(!v)  return;
    p.appendChild(v)
    cs.forEach(e => p.removeChild(e))
    v.style.height='100%'
    v.style.width='auto'    
	}

	function addButton(text, onclick, cssObj) {
		cssObj = cssObj || {}
		let dflt = {position: 'fixed', bottom: '7%', left:'13%', 'z-index': 3}
		Object.keys(dflt).filter(k => !cssObj[k]).forEach(k => cssObj[k]=dflt[k])
		let button = d.createElement('button'), btnStyle = button.style
		d.body.appendChild(button)
		button.innerHTML = text
		button.onclick = onclick
		btnStyle.position = 'absolute'
		Object.keys(cssObj).forEach(key => btnStyle[key] = cssObj[key])
		return button
	}
}(window, document))