Shortcut for putting focus on searchbox using cjs extension for chromium browsers

For duckduckgo.com

document.addEventListener('keydown', function (event) {
  if (event.ctrlKey && event.key === 'f') {
    const box = document.getElementById('search_form_input');
    box.focus();
    box.value = '';
    window.scroll(0,0);
  }
});

For startpage.com

document.addEventListener('keydown', function (event) {
  if (event.ctrlKey && event.key === 'f') {
    const box = document.getElementById('q');
    box.focus();
    box.value = '';
  }
});