let changeColor = document.getElementById('changeColor') chrome.storage.sync.get('color', function(data) { changeColor.style.backgroundColor = data.color changeColor.setAttribute('value', data.color) }) changeColor.onclick = function(element) { let color = element.target.value chrome.tabs.query({ active: true, currentWindow: true }, function(tabs) { chrome.tabs.executeScript( tabs[0].id, {code: 'document.body.style.backgroundColor = "' + color + '";'} ) }) }