What Is Privacy Badger?

Privacy Badger is a free browser extension made by the Electronic Frontier Foundation (EFF), a digital rights nonprofit. It automatically stops companies from tracking your browsing across websites. You install it in your browser, and it learns which third-party domains appear to be tracking you, then blocks them. It is not an ad blocker by design, though blocking trackers often removes ads as a side effect.

What Privacy Badger actually does

Privacy Badger watches the third-party domains that load as you browse. When the same domain shows up across many unrelated sites, that pattern suggests it is tracking you rather than serving a specific site's content. Privacy Badger blocks those domains automatically, without relying on a fixed blocklist that you have to maintain.

This is the core difference from most ad blockers. Traditional blockers ship with curated lists of known ad and tracker domains. Privacy Badger instead observes behavior and adapts, so it can catch trackers that a static list might miss.

How it differs from other blocking extensions

Because Privacy Badger targets tracking rather than advertising, it does not block every ad. Ads served directly by a site you visit, without a third-party tracker, may still appear. That is intentional: the goal is privacy, not a fully ad-free page.

Key features worth knowing

• Social media widget handling. Embedded social widgets can report your visit back to the platform. Privacy Badger can block that tracking behavior.
• Global Privacy Control (GPC). Privacy Badger sends the GPC signal, which tells sites you do not want your data sold or shared, where the law requires them to honor it.
• Fingerprinting protection. It takes steps to reduce the ability of sites to identify you by the unique characteristics of your browser.
• Slider controls. The menu shows red, yellow, and green sliders per domain. Red means blocked, yellow means blocked cookies only, and green means allowed. You can adjust these yourself.

Supported browsers

Privacy Badger is available for Chrome, Firefox (including Firefox for Android), Edge (including Edge for Android), Opera, and Brave. The site notes that some browsers are not supported and shows a "Browser Not Supported" message when you visit with one. If your browser is not listed, alternative installation options are provided.

Who makes it and why that matters

Privacy Badger is built by the EFF, an organization focused on digital civil liberties. It is free to use and funded by donations rather than by selling data or showing ads. That matters because a privacy tool's business model affects whose interests it serves.

When Privacy Badger is a good fit

Choose Privacy Badger if you want automatic, low-maintenance protection against cross-site tracking and you are comfortable with a tool that learns rather than follows a fixed list. It pairs well with other extensions, including ad blockers, and with Firefox's built-in privacy protections.

Consider a different approach if your main goal is aggressively blocking all advertising, or if you need fine-grained, list-based control over exactly what loads. In those cases a dedicated ad blocker or a filter-list manager may suit you better. Many people run both.

Getting started

1. Open privacybadger.org in a supported browser.
2. Click the install button for your browser (for example, "Add to Chrome" or "Add to Firefox").
3. Confirm the installation when your browser prompts you.
4. Browse normally. Privacy Badger begins learning which third parties track you and blocks them automatically.
5. Click the Privacy Badger icon to review the sliders and adjust any domain you want to allow or block.

After installation, you should see the extension icon in your toolbar. If a site breaks, check the sliders for that site and move a blocked domain to yellow or green to allow it.