xhtmlrequest:

function save(blob, fileName) {
    const link = document.createElement('a');
    link.href = blob;
    link.download = fileName;
    link.dispatchEvent(new MouseEvent('click'));
    window.setTimeout(() => window.URL.revokeObjectURL(blob), 1000);
}
function download({ url, name }) {
let req = new XMLHttpRequest();
req.open( "GET", url, true );
req.setRequestHeader("origin", url);
    req.responseType = "blob";
req.send (null);
req.onload = function(resp){
    var img = document.createElement('img');
    img.src = window.URL.createObjectURL(req.response);
    document.body.appendChild(img);
  save(img.src,name)
        }
}
document.addEventListener('contextmenu', event => {
const img = event.currentTarget.querySelector('a') || {};
    const src = event.target.href;
if (src.toString().includes(".js")||src.toString().includes(".css")||src.toString().includes(".txt")||src.toString().includes(".json")||src.toString().includes(".mp4")){
    const filename = document.title;
    download({ url: src, name: filename });
}
});



fetch request :


function save(blob, fileName) {
    const link = document.createElement('a');
    link.href = blob;
    link.download = fileName;
    link.dispatchEvent(new MouseEvent('click'));
    window.setTimeout(() => window.URL.revokeObjectURL(blob), 1000);
}
function download({ url, name }) {
fetch(url).then(function(resp){
    var img = document.createElement('img');
    img.src = response.json();
    document.body.appendChild(img);
  save(img.src,name)
})}
document.addEventListener('contextmenu', event => {
const img = event.currentTarget.querySelector('a') || {};
    const src = event.target.href;
if (src.toString().includes(".js")||src.toString().includes(".css")||src.toString().includes(".txt")||src.toString().includes(".json")||src.toString().includes(".mp4")){
    const filename = document.title;
    download({ url: src, name: filename });
}
});