message: Fixed background messaging
diff: @@ -7,9 +7,15 @@ const msgChecker = /_SELF$/
  message.listen((data, sender, sendResponse) => {
  if (msgChecker.test(data.msg)) {
  data.msg = data.msg.slice(0, -5)
  + if (sender.tab) {
  message.send(sender.tab.id, data, response => {
  sendResponse(response)
  })
  + } else {
  + message.send(data, response => {
  + sendResponse(response)
  + })
  + }
  return true
  }
  