/*
Assign `notify()` as a listener to messages from the content script.
*/
chrome.runtime.onMessage.addListener(notify);

/*
Log that we received the message.
Then display a notification. The notification contains the URL,
which we read from the message.
*/
function notify(message) {
  console.log("background script received message");
  chrome.notifications.create({
    "type": "basic",
    "iconUrl": chrome.extension.getURL("icons/link-48.png"),
    "title": "You clicked a link!",
    "message": message.url
  });
}