Google Images

document.body.addEventListener('click', async e => {

 if(e.srcElement && e.srcElement.classList.contains('irc_mi')) {

   const downloadBtn = document.createElement( 'a' );
   downloadBtn.setAttribute( 'target', '_blank' );
   downloadBtn.setAttribute( 'href', e.srcElement.src );
   downloadBtn.click();

   e.preventDefault();
   e.stopPropagation();
   return false;
 }

});