Youtube user script to hide recommendations and to redirect to a blank page after a video has ended. No guarantee given that it works.

gistfile1.txt

// Remove sidebar repeatedly
setInterval(function() {
  const sidebar = document.querySelector('#watch7-sidebar')
  if (sidebar && sidebar.remove) sidebar.remove()
  const sidebarModules = document.querySelector('#watch7-sidebar-modules')
  if (sidebarModules && sidebarModules.remove) sidebarModules.remove()
  console.log('test')
}, 500)

// Remove player after it has been stopped
const id = setInterval(function() {
  const hasStopped = !!document.querySelector('.ytp-play-button').title
  if (hasStopped) {
    clearInterval(id)
    location.replace('about:blank')
  }
}, 200)