A utility function to bulk download images on a page

downloadImages.js

function downloadImages(selector) {
  function saveImg(blob, fileName) {
    var a = document.createElement("a")
    document.body.appendChild(a)
    a.style = "display: none"

    var url = window.URL.createObjectURL(blob)
    a.href = url
    a.download = fileName
    a.click()
    window.URL.revokeObjectURL(url)
  }

  const srcURLs = [...document.querySelectorAll(selector)].map(node => node.src)

  return srcURLs.map(async (src) => {
    const res = await fetch(src)
    const blob = await res.blob()
    saveImg(blob, src)
  })
}