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);
});

let mOverlay = document.createElement("div");
mOverlay.innerHTML = "<b>QUQ</b>";

changeColor.onclick = function(element) {
  // TODO: Add settings to STORAGE

  let color = element.target.value;
  chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
    chrome.tabs.executeScript(
      tabs[0].id,
      {file: 'contentScript.js'});
  });
};