Stream Ad Blocker

One click to play. No more ads.

Watch NBA, NFL, NHL, MLB, and other live sports on free streaming sites — without popups, overlays, or click hijacking. Just click play and it works.

Before vs After

Without Extension	With Extension
Click play → ad tab opens	Click play → Lakers vs Rockets starts
Click again → sportsbetting.ag popup	No popups, no redirects
Click 5-10 times → game finally loads	First click works
Random .exe downloads	Downloads blocked

Supported Sites

• istreameast
• streameast
• Other sites using the same ad SDK (aclib / Adcash popunder system)

Works on any site that uses aclib.runPop for popunders — which covers most free streaming sites.

What It Blocks

• Popunder ads — new tabs opening behind your current window
• Click hijacking — your first N clicks being stolen by ad scripts
• Overlay ads — invisible layers covering the video player
• Fake scripts — ad SDKs disguised as jquery.min.js
• Malicious downloads — .exe, .dmg, .apk files triggered by clicks
• Tracking — analytics and fingerprinting scripts
• Ad redirects — navigation to betting/gambling sites like sportsbetting.ag

Install

1. Clone this repo:

   git clone https://github.com/orangeCatDeveloper/streameast-ad-blocker.git

2. Open chrome://extensions/ in Chrome
3. Enable Developer mode (top right)
4. Click Load unpacked → select the cloned folder
5. Done. Go to a streaming site and click play.

How It Works

Three layers of protection:

Layer 1 — Network Blocking (rules.json) Blocks 38 known ad domains and scripts before they load, using Chrome's declarativeNetRequest API.

Layer 2 — JavaScript API Override (inject.js → MAIN world) Overrides browser APIs that ads abuse:

• window.open → blocked (kills popunders)
• aclib.runPop → neutered via Proxy (the ad SDK runs but does nothing)
• addEventListener → filters out obfuscated click hijack handlers
• document.createElement("script") → blocks dynamically loaded ad scripts

Layer 3 — DOM Cleanup (content.js → isolated world) Removes ad elements from the page:

• Strips overlay <div>s with high z-index
• Removes hidden 1×1 tracking iframes
• Blocks the fake jquery.min.js (actually a 610KB ad loader)

Technical Deep Dive

Why use a Proxy for aclib?

The ad SDK creates window.aclib and assigns methods like runPop. Simply replacing runPop with a no-op doesn't work — the SDK can reassign it after your override.

A Proxy wraps the entire object and intercepts reads. No matter what the SDK assigns internally, any access to aclib.runPop always returns a no-op:

Object.defineProperty(window, "aclib", {
  set(v) {
    _aclib = new Proxy(v, {
      get(target, prop) {
        return AD_METHODS.has(prop) ? noop : target[prop];
      }
    });
  }
});

Why not use manifest "world": "MAIN"?

Chrome's manifest-based "world": "MAIN" doesn't work reliably across all Chromium browsers (Arc, Brave, older Edge). We use chrome.scripting.executeScript from the background service worker instead, with a web_accessible_resources fallback. Both run before page scripts.

The fake jQuery trick

Some embed pages (like embedsports.top) load /js/jquery.min.js — but it's not jQuery. It's a 610KB obfuscated ad SDK (starts with window['ZpQw9XkLmN8c3vR3']). The extension blocks this at both the network level and DOM level.

Project Structure

├── manifest.json     # Extension config (Manifest V3)
├── background.js     # Service worker — MAIN world injection via executeScript
├── inject.js         # Overrides window.open, aclib, addEventListener, createElement
├── content.js        # DOM cleanup — MutationObserver + periodic overlay removal
├── rules.json        # declarativeNetRequest — 38 blocked domains/scripts
├── popup.html/js     # Extension popup UI
└── icons/            # Extension icons

Contributing

Found a site where ads still get through? Open an issue with:

1. The site URL
2. What ads you see (popup? overlay? redirect?)
3. Console errors (F12 → Console → look for [SAB] logs)

License

MIT