trimlog-ykonsole-chrome-extension/popup.js

let changeColor = document.getElementById('changeColor');
chrome.storage.sync.get('color', function(data) {
  changeColor.style.backgroundColor = data.color;
  changeColor.setAttribute('value', data.color);
});

chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
  console.log("test");

  chrome.tabs.executeScript(
    tabs[0].id,
    {file: 'contentScript.js'});
});