Converts all the external images in a webpage to inline base64 format - which makes it easier to then "Save" the whole document without worrying about missing images

external-img-to-inlinebase64.js

// Convert all img tags to use base64 src
function toDataUrl(url, elem) {
    var xhr = new XMLHttpRequest();
    xhr.onload = function() {
        var reader = new FileReader();
        reader.onloadend = function() {
            //callback(reader.result);
			elem.src = reader.result
        }
        reader.readAsDataURL(xhr.response);
    };
    xhr.open('GET', url);
    xhr.responseType = 'blob';
    xhr.send();
}

imgs=document.getElementsByTagName('img');

for(var i =0;i<imgs.length;i++){
 origUrl = imgs[i].src;
 toDataUrl(origUrl,imgs[i])
}

// To run this, you can just copy and past the above at the developer console of your browser