GM_download original server filename parsed wrong

[Owyn]

When I don't specify a filename for the gm_download and it tries to use the server one - it doesn't parse it properly, e.g.
%20 - doesn't turn into spaces, you just remove % sign leaving 20 there and thus corrupting the filename

server filename which is given

file%20name.jpg

Expected Behavior

file name.jpg

Actual Behavior

file20name.jpg

Specifications

• FF 129.0
• TM: 5.1.1
• OS: Win 10

Script

Example script:

// ==UserScript==
// @name         Test for GM_download
// @namespace    http://tampermonkey.net/
// @version      2025
// @description  try to take over the world!
// @author       You
// @icon         https://www.google.com/s2/favicons?sz=64&domain=tampermonkey.net
// @match        https://www.google.com.hk/*
// @match        https://www.google.com/*
// @grant        GM_download
// @include      https://rule34.paheal.net/post/view/13409
// ==/UserScript==

(function() {
    'use strict';

    document.querySelector('#main_image').addEventListener('click', function(){
        console.log("a click on the image");
        GM_download({
            "url": document.querySelector('#main_image').src,
            "name": null,
            "saveAs": true,
            "onload": function(e) {
                console.log("onload: %o", e);
            },
            "onerror": function(e) {
                console.log("onerror: %o", e);
            },
            "onprogress": function(e) {
                console.log("onprogress: %o", e);
            },
            "ontimeout ": function(e) {
                console.log("ontimeout : %o", e);
            }
        });
    });
})();

example url with an image to left click (it will do the gm_download) then compare it with the name it'd give you if you right-click -> save as it: https://rule34.paheal.net/post/view/13409

[derjanb]

Should be fixed at 5.3.6208 (crx|xpi in review)