Blocks domains via AdGuard DNS filter + handles adblock testers with styled popup modal
// ==UserScript==
// @name AdGuard DNS + Anti-Adblock Handler (Modal Popup)
// @namespace https://adguardteam.github.io/
// @version 1.1
// @description Blocks domains via AdGuard DNS filter + handles adblock testers with styled popup modal
// @author You
// @match *://*/*
// @run-at document-start
// @grant GM_xmlhttpRequest
// @grant GM_getValue
// @grant GM_setValue
// ==/UserScript==
(function() {
'use strict';
const FILTER_URL = "https://adguardteam.github.io/AdGuardSDNSFilter/Filters/filter.txt";
const CACHE_KEY = "adguard_filter_cache";
const CACHE_TIME_KEY = "adguard_filter_cache_time";
const CACHE_TTL = 24 * 60 * 60 * 1000; // 24h
let blockedDomains = [];
// Load filter list with caching
function loadFilterList() {
let lastFetch = GM_getValue(CACHE_TIME_KEY, 0);
let now = Date.now();
if (now - lastFetch < CACHE_TTL) {
blockedDomains = GM_getValue(CACHE_KEY, []);
console.log("[AdGuard Script] Loaded cached domains:", blockedDomains.length);
return;
}
GM_xmlhttpRequest({
method: "GET",
url: FILTER_URL,
onload: function(response) {
const lines = response.responseText.split("\n");
blockedDomains = lines
.filter(line => line.startsWith("||"))
.map(line => line.replace("||", "").replace("^", "").trim());
GM_setValue(CACHE_KEY, blockedDomains);
GM_setValue(CACHE_TIME_KEY, now);
console.log("[AdGuard Script] Updated filter list:", blockedDomains.length);
},
onerror: function() {
console.warn("[AdGuard Script] Failed to fetch filter list");
blockedDomains = GM_getValue(CACHE_KEY, []);
}
});
}
// Block network requests (XHR + fetch)
const origOpen = window.XMLHttpRequest.prototype.open;
window.XMLHttpRequest.prototype.open = function(method, url) {
if (blockedDomains.some(domain => url.includes(domain))) {
console.warn("[AdGuard Script] Blocked request:", url);
return; // cancel
}
return origOpen.apply(this, arguments);
};
const origFetch = window.fetch;
window.fetch = function(input, init) {
const url = typeof input === "string" ? input : input.url;
if (blockedDomains.some(domain => url.includes(domain))) {
console.warn("[AdGuard Script] Blocked fetch:", url);
return Promise.reject("Blocked by AdGuard Userscript");
}
return origFetch.apply(this, arguments);
};
// Watch DOM for ad elements and remove them
const observer = new MutationObserver(() => {
blockedDomains.forEach(domain => {
document.querySelectorAll(`img[src*="${domain}"], iframe[src*="${domain}"], script[src*="${domain}"]`)
.forEach(el => {
console.warn("[AdGuard Script] Removed element:", el.src);
el.remove();
});
});
});
observer.observe(document, { childList: true, subtree: true });
// Show styled popup modal
function showAntiAdblockModal() {
let modal = document.createElement("div");
modal.innerHTML = `
<div id="adblock-modal" style="
position: fixed;
top: 0; left: 0; right: 0; bottom: 0;
background: rgba(0,0,0,0.6);
display: flex;
align-items: center;
justify-content: center;
z-index: 999999;">
<div style="
background: #fff;
padding: 20px 30px;
border-radius: 8px;
max-width: 400px;
text-align: center;
font-family: Arial, sans-serif;">
<h2 style="margin: 0 0 10px; color: #e74c3c;">⚠ AdBlock Detected</h2>
<p style="margin: 0 0 15px; font-size: 15px; color: #333;">
This site has detected you are using an Ad Blocker.<br>
Please disable it to continue browsing smoothly.
</p>
<button id="disable-adblock-btn" style="
background: #e74c3c;
color: #fff;
padding: 10px 20px;
border: none;
border-radius: 5px;
font-size: 14px;
cursor: pointer;">
I Understand
</button>
</div>
</div>
`;
document.body.appendChild(modal);
document.getElementById("disable-adblock-btn").addEventListener("click", () => {
document.getElementById("adblock-modal").remove();
});
}
// Detect anti-adblock attempts
function antiAdblockWatcher() {
let bait = document.createElement("div");
bait.className = "ad ad-banner ad-unit adblock-detect";
bait.style.position = "absolute";
bait.style.left = "-9999px";
document.body.appendChild(bait);
setTimeout(() => {
if (bait.offsetParent === null || bait.offsetHeight === 0 || bait.offsetWidth === 0) {
// Triggered anti-adblock detection
showAntiAdblockModal();
}
bait.remove();
}, 1500);
}
window.addEventListener("load", antiAdblockWatcher);
// Run filter loading
loadFilterList();
})();