event.preventDefault() не работает в Firefox

let focus = document.getElementsByClassName('results'); 
let key = 1; 
 
document.addEventListener('keydown', (event) => { 
 
  const keyName = event.key; 
  if (keyName === 'ArrowDown') { 
 
    event.preventDefault(); 
    event.stopPropagation(); 
    event.stopImmediatePropagation(); 
 
    focus[key].focus(); 
    key++; 
 
    if (key >= 3) { 
      key = 0 
    } 
 
  } 
});

<select class="results"> 
  <option>1</option> 
  <option>2</option> 
  <option>3</option> 
</select> 
<select class="results"> 
  <option>1</option> 
  <option>2</option> 
  <option>3</option> 
</select> 
<select class="results"> 
  <option>1</option> 
  <option>2</option> 
  <option>3</option> 
</select>