AdVeil

An open-source, cross-browser extension that blocks overlay ads, popunder redirects, and trackers - with all detection running locally in your browser.

Add to Chrome Add to Firefox Download latest release View source on GitHub Privacy policy

Now available on the Chrome Web Store and Firefox Add-ons. You can also install it manually from a GitHub release or straight from source (see below).

What it does

Overlay ad detection Identifies and hides full-screen interstitials, sticky popups, anti-adblock nags, and cookie-wall-style overlays using a weighted heuristic engine - not a static selector list.
Popunder / clickunder protection Blocks scripts that hijack clicks to open ad, gambling, or scam redirects in a new tab, including those triggered from embedded third-party iframes.
Network-level blocking Blocks requests to a curated list of known ad and tracker domains via Chrome's declarativeNetRequest.
Cosmetic filtering Hides common ad containers (.adsbygoogle, banner slots, native ad widgets) via injected CSS.
Per-site control Global on/off toggle, per-site pause, and one-click restore for pages affected by a false positive.

Install

Chrome / Chromium / Edge

Recommended: install from the Chrome Web Store. To load an unpacked build instead:

Download and unzip the latest Chrome release (or clone the source).
Open chrome://extensions and enable Developer mode.
Select Load unpacked and choose the unzipped folder.

Firefox

Recommended: install from Firefox Add-ons. To load a temporary build instead:

Download and unzip the latest Firefox release (or clone the source).
Open about:debugging#/runtime/this-firefox.
Select Load Temporary Add-on… and choose manifest.json. Temporary add-ons are removed on restart; for a persistent session use Mozilla's web-ext CLI.

Privacy

AdVeil requests broad permissions (<all_urls>) because ad detection has to run on every page load. Nothing is collected, transmitted, or sold - see the full privacy policy for exactly what that access is used for.

Open source

Full source code, including the backend for the optional bug-report feature, is available at github.com/achintha-ekanayake/AdVeil. Contributions are welcome - see CONTRIBUTING.md.

Frequently asked questions

Is AdVeil free to use?

Yes. AdVeil is free and open source under the MIT license.

Does AdVeil collect or sell my data?

No. All ad and tracker detection runs locally in your browser; nothing is collected, transmitted, or sold. See the privacy policy for details.

Which browsers does AdVeil support?

Chrome, Chromium-based browsers such as Edge, and Firefox, from a single Manifest V3 codebase.

Why does AdVeil need access to all websites?

Overlay ad and popunder detection has to run on every page load, which requires the <all_urls> permission. See the privacy policy for exactly what that access is used for.

Where can I get AdVeil?

Install it from the Chrome Web Store, or download the latest release from GitHub to load it manually in Chrome or Firefox.