in my app.js, I’m using current.Window
rather than lastFocusedWindow
button_element.addEventListener('click', () => {
chrome.tabs.query({active: true, currentWindow: true}, function(tabs){
arr.push(tabs[0].url)
localStorage.setItem("example", JSON.stringify(arr) )
render(arr)
})
})
That works for pushing the current tab to local storage