Enable/disable Google Discover by toggling ?gl=nz. Adds a non-blocking prompt for first-time users with snooze/never options. Persists across sessions.
// ==UserScript==
// @name Google Discover Toggle
// @namespace https://github.com/ymhomer/ym_Userscript
// @version 1.3
// @description Enable/disable Google Discover by toggling ?gl=nz. Adds a non-blocking prompt for first-time users with snooze/never options. Persists across sessions.
// @author ymhomer
// @match https://www.google.com/*
// @match https://www.google.*/*
// @grant GM_registerMenuCommand
// @grant GM_setValue
// @grant GM_getValue
// @run-at document-start
// @noframes
// @license MIT
// ==/UserScript==
;(async function () {
'use strict';
const STORAGE_KEY = 'discoverEnabled';
const PROMPT_NEVER_KEY = 'discoverPromptNever';
const SNOOZE_UNTIL_KEY = 'discoverSnoozeUntil';
const GL_PARAM = 'gl';
const DISCOVER_GL = 'nz';
const SNOOZE_MS = 24 * 60 * 60 * 1000; // 1 day
const REDIRECT_GUARD_KEY = 'gdt_last_redirect';
const REDIRECT_GUARD_MS = 8000;
const GMAPI = (typeof GM?.getValue === 'function')
? {
get: (k, d) => GM.getValue(k, d),
set: (k, v) => GM.setValue(k, v),
menu: (label, cb) => GM.registerMenuCommand(label, cb),
}
: {
get: (k, d) => Promise.resolve(GM_getValue(k, d)),
set: (k, v) => Promise.resolve(GM_setValue(k, v)),
menu: (label, cb) => GM_registerMenuCommand(label, cb),
};
const topWindow = (window.top === window.self);
if (!topWindow) return;
const path = location.pathname;
const isEligiblePath = (path === '/' || path === '/search');
function getGL(urlLike) {
try {
const u = new URL(urlLike || location.href);
return u.searchParams.get(GL_PARAM);
} catch {
return null;
}
}
function withGL(urlLike, value) {
try {
const u = new URL(urlLike || location.href);
const sp = u.searchParams;
if (value == null) {
sp.delete(GL_PARAM);
} else {
sp.set(GL_PARAM, value);
}
return u.toString();
} catch {
return urlLike || location.href;
}
}
function shouldGuardRedirect() {
try {
const last = sessionStorage.getItem(REDIRECT_GUARD_KEY);
const now = Date.now();
if (last && (now - Number(last) < REDIRECT_GUARD_MS)) return true;
sessionStorage.setItem(REDIRECT_GUARD_KEY, String(now));
return false;
} catch {
return false;
}
}
// Persistent values
const enabled = await GMAPI.get(STORAGE_KEY, undefined);
const promptNever = await GMAPI.get(PROMPT_NEVER_KEY, false);
const snoozeUntil = Number(await GMAPI.get(SNOOZE_UNTIL_KEY, 0)) || 0;
// If user already enabled, enforce gl=nz if needed
if (enabled === true) {
const currentGL = getGL(location.href);
if (currentGL !== DISCOVER_GL && !shouldGuardRedirect()) {
location.replace(withGL(location.href, DISCOVER_GL));
return;
}
}
// Menu toggle
const menuLabel = (() => {
if (enabled === true) return 'Disable Google Discover';
if (enabled === false) return 'Enable Google Discover';
return 'Enable Google Discover (not set)';
})();
GMAPI.menu(menuLabel, async () => {
const newState = !(enabled === true);
await GMAPI.set(STORAGE_KEY, newState);
if (newState) {
if (getGL(location.href) !== DISCOVER_GL) {
location.replace(withGL(location.href, DISCOVER_GL));
return;
}
}
// if disabling, do not touch current gl — just reload to apply menu label if needed
location.reload();
});
// First-time prompt logic (only if no decision yet)
const shouldPrompt =
enabled === undefined &&
!promptNever &&
Date.now() >= snoozeUntil &&
isEligiblePath;
if (!shouldPrompt) return;
// Wait for body to exist before injecting UI
if (!document.body) {
await new Promise((res) => {
const obs = new MutationObserver(() => {
if (document.body) {
obs.disconnect();
res();
}
});
obs.observe(document.documentElement, { childList: true, subtree: true });
});
}
// Render prompt (Shadow DOM)
const host = document.createElement('div');
host.setAttribute('data-gdt', 'host');
host.style.position = 'fixed';
host.style.top = '16px';
host.style.right = '16px';
host.style.zIndex = '2147483647';
host.style.all = 'initial'; // avoid leaking styles
document.body.appendChild(host);
const shadow = host.attachShadow({ mode: 'closed' });
const wrap = document.createElement('div');
const style = document.createElement('style');
style.textContent = `
:host, * { box-sizing: border-box; }
.card {
font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
font-size: 13px;
line-height: 1.35;
color: #1f1f1f;
background: rgba(255,255,255,0.96);
backdrop-filter: saturate(150%) blur(6px);
border: 1px solid rgba(0,0,0,0.08);
border-radius: 12px;
box-shadow: 0 8px 30px rgba(0,0,0,0.12);
width: 280px;
padding: 12px 12px 10px;
}
@media (prefers-color-scheme: dark) {
.card {
color: #eaeaea;
background: rgba(32,32,32,0.92);
border-color: rgba(255,255,255,0.08);
box-shadow: 0 8px 30px rgba(0,0,0,0.48);
}
.btn { color: #eaeaea; border-color: rgba(255,255,255,0.18); }
.btn--primary { background: #1a73e8; color: white; border-color: transparent; }
}
.title { font-weight: 600; margin-bottom: 6px; }
.desc { opacity: 0.8; margin-bottom: 10px; }
.row {
display: flex; gap: 8px; justify-content: flex-end;
}
.btn {
appearance: none;
border: 1px solid rgba(0,0,0,0.18);
background: transparent;
border-radius: 8px;
padding: 6px 10px;
cursor: pointer;
font: inherit;
transition: transform .06s ease, background .12s ease;
}
.btn:hover { background: rgba(0,0,0,0.04); }
.btn:active { transform: translateY(1px); }
.btn--primary {
background: #1a73e8;
color: white;
border-color: transparent;
}
.sr { position:absolute; width:1px; height:1px; clip:rect(1px,1px,1px,1px); overflow:hidden; white-space:nowrap; }
`;
wrap.innerHTML = `
<div class="card" role="dialog" aria-label="Google Discover setting">
<div class="title">Enable Google Discover?</div>
<div class="desc">Add <code>?gl=${DISCOVER_GL}</code> to keep Discover feed consistent on this device.</div>
<div class="row">
<button class="btn" data-action="never" aria-label="Never show again">Never</button>
<button class="btn" data-action="later" aria-label="Not now">Not now</button>
<button class="btn btn--primary" data-action="enable" aria-label="Enable">Enable</button>
</div>
<span class="sr">Use Tab to navigate buttons</span>
</div>
`;
shadow.appendChild(style);
shadow.appendChild(wrap);
function removePrompt() {
try { host.remove(); } catch {}
}
async function onAction(action) {
if (action === 'enable') {
await GMAPI.set(STORAGE_KEY, true);
removePrompt();
if (getGL(location.href) !== DISCOVER_GL) {
location.replace(withGL(location.href, DISCOVER_GL));
return;
}
location.reload();
} else if (action === 'later') {
await GMAPI.set(SNOOZE_UNTIL_KEY, Date.now() + SNOOZE_MS);
removePrompt();
} else if (action === 'never') {
await GMAPI.set(PROMPT_NEVER_KEY, true);
await GMAPI.set(STORAGE_KEY, false);
removePrompt();
}
}
wrap.addEventListener('click', (e) => {
const t = e.target;
if (!(t instanceof Element)) return;
const act = t.getAttribute('data-action');
if (act) onAction(act);
});
})();