Programatically self-update a Firefox Addon

self-update.js

const self = require('sdk/self');
const chrome = require('chrome');

/**
 * Autoupdate this addon on startup
 */
(function() {
  let AddonManager = chrome.Cu.import('resource://gre/modules/AddonManager.jsm', null).AddonManager;
  
  AddonManager.getAddonByID(self.id, function(addon) {
    addon.findUpdates({
      onUpdateAvailable: function(addon, install) {
        install.install();
      }
    }, AddonManager.UPDATE_WHEN_PERIODIC_UPDATE);
  });
})();