Firefox Translate Helper

Replace bogus html lang=en with lang="" (helps built-in Translate)

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// ==UserScript==
// @name         Firefox Translate Helper
// @author       mekineer and Nova (ChatGPT 5.2 Thinking)
// @namespace    https://mekineer.com
// @license      GPL-3.0-or-later
// @version      0.3
// @description  Replace bogus html lang=en with lang="" (helps built-in Translate)
// @match        *://*/*
// Example: @exclude-match https://example.com/* (remove leading Example and starting with @ will make active)
// Example: @exclude-match https://*.example.org/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(() => {
  if (window.top !== window.self) return;

  const fix = () => {
    const html = document.documentElement;
    if (!html) return;

    const lang = (html.getAttribute("lang") || "").toLowerCase().trim();
    if (lang === "en" || lang.startsWith("en-")) {
      html.setAttribute("lang", "");
    }
  };

  fix();

  new MutationObserver(fix).observe(document.documentElement, {
    attributes: true,
    attributeFilter: ["lang"],
  });
})();