background.js

/*
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

'use strict';

chrome.runtime.onInstalled.addListener(function() {
  chrome.storage.sync.set({color: '#3aa757'}, function() {
    console.log("The color is green.");
  });
  chrome.declarativeContent.onPageChanged.removeRules(undefined, function() {
    chrome.declarativeContent.onPageChanged.addRules([{
      conditions: [new chrome.declarativeContent.PageStateMatcher({
        pageUrl: {hostEquals: 'developer.chrome.com'},
      })
      ],
          actions: [new chrome.declarativeContent.ShowPageAction()]
    }]);
  });
});
*/

chrome.runtime.onMessage.addListener(
  function(request, sender, sendResponse) {

    if (request.msg === "analyse") {
      chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
        chrome.tabs.sendMessage(tabs[0].id, {msg: "execute"}, function(response) {
          console.log(response.farewell);
        });
      });
      /*
      chrome.runtime.sendMessage({
        msg: "execute"
      });
      console.log("execute command broadcasted");
      */
    }
  }
);