Canvas Ripper

var a = document.createElement("a");
document.body.appendChild(a);
a.style = "display: none";
[].slice.apply(document.getElementsByClassName('js-page-image')).forEach((c, i) => c.toBlob(b => {
        var url = window.URL.createObjectURL(b);
        a.href = url;
        a.download = i + ".png";
        a.click();
        window.URL.revokeObjectURL(url);
}));