If you’re OK with pixellated then add to your user CSS:

  .image img.g-lazy { filter: none !important; }

If you want the originals and can run user JS then something like:

  window.addEventListener('DOMContentLoaded',() => {
    document.querySelectorAll('.media-viewer-candidate').forEach(el => {
      el.src = el.dataset['mediaviewer-src']
    })
  })