Chrome extension: detect when popup window closes

Question

For my chrome extension, I want to perform an action when the browserAction popup window closes. I understand that there no built-in events are triggered when this happens.

Answer 1

For reference, here's the working version of the background.js script:

chrome.runtime.onConnect.addListener(function (externalPort) {
  externalPort.onDisconnect.addListener(function () {
    console.log("onDisconnect")
    // Do stuff that should happen when popup window closes here
  })

  console.log("onConnect")
})