Save images to hard disk WITHOUT prompt?

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It is possible when using Tampermonkey or Violentmonkey (Firefox or Chrome). Those userscript managers have added a GM_download method.

You can use it like this:

// ==UserScript==
// @name         New Userscript
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        http*://*/*
// @grant        GM_download
// ==/UserScript==


var arg = { url: "https://example.com/123456.jpg",
            name: "CustomFileName.jpg"
          };

GM_download(arg);

See the official Tampermonkey documentation.

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