[Areaccely]

Ура! Нашел решение.
content_scripts.js

var urlTab;
urlTab = window.location.href;
//Отправка информации в popup.js
chrome.runtime.sendMessage({greeting: "hello", data:urlTab }, function(response) {
  console.log(response.farewell);
});

popup.js

document.addEventListener("click", function() {
	chrome.tabs.executeScript(null, {
		file: "/content_scripts/content_scripts.js"
	});
});

//вставка URL из браузера 
chrome.runtime.onMessage.addListener(
  function(request, sender, sendResponse) {
    console.log(sender.tab ?
                "from a content script:" + sender.tab.url :
                "from the extension");
    if (request.greeting == "hello"){
		var input = document.getElementById("Url");
		input.value = request.data;
		sendResponse({farewell: "goodbye"});
	};
  });