userscripts

goodbye.js

var script = document.createElement("script")
script.id = "goodbye"
script.innerHTML = "           \
  window.onbeforeunload = null \
"
document.documentElement.appendChild(script)

notifier.js

var script = document.createElement("script")
script.id = "notifier"
script.innerHTML = "                                         \
  window.alert = window.confirm = function(alert) {         \
    if (Notification.permission === 'granted') {             \
      var notification = new Notification(alert)             \
    }                                                        \
    else if (Notification.permission !== 'denied') {         \
      Notification.requestPermission(function (permission) { \
        if (permission === 'granted') {                      \
          var notification = new Notification(alert)         \
        }                                                    \
      })                                                     \
    }                                                        \
  }                                                          \
"
document.documentElement.appendChild(script)