I made this extension as an exercise in passing current page parameters onto another script later down the road. Using chrome.tabs.getSelected, I can retrieve the url and title of almost any page that I navigate to...except Youtube. For some reason, the alert box shows the current URL, but the previous title.

I have tried delaying the retrieval of the title, but that has produced other problems like multiple alerts or "undefined" values.

background.js

chrome.webNavigation.onHistoryStateUpdated.addListener(function(details) {
    chrome.tabs.getSelected(null,function(tab) { // null defaults to current window
        if(typeof chrome._LAST_RUN === 'undefined' || notRunWithinTheLastSecond(details.timeStamp)){
            // Fires only when details.url === currentTab.url
            chrome._LAST_RUN = details.timeStamp;
                    var myurl = tab.url;
                    var mytitle = tab.title;
                    zurl = myurl + "\r\n" + "\r\n" + mytitle;
                    alert(zurl);
        }
    });
});
const notRunWithinTheLastSecond = (dt) => {
    const diff = dt - chrome._LAST_RUN
    if (diff < 2000){
      return false
    } else {
      return true
    }
  }

manifest.json

"permissions"       : [ 
    "tabs",
    "webNavigation"
]