Firefox Translate Helper

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

K instalaci tototo skriptu si budete muset nainstalovat rozšíření jako Tampermonkey, Greasemonkey nebo Violentmonkey.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Violentmonkey.

K instalaci tohoto skriptu si budete muset nainstalovat rozšíření jako Tampermonkey nebo Userscripts.

You will need to install an extension such as Tampermonkey to install this script.

K instalaci tohoto skriptu si budete muset nainstalovat manažer uživatelských skriptů.

(Už mám manažer uživatelských skriptů, nechte mě ho nainstalovat!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(Už mám manažer uživatelských stylů, nechte mě ho nainstalovat!)

// ==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"],
  });
})();