Privacy Badger automatically learns to block invisible trackers.

Install for Chrome

Install for Firefox

Install for Firefox on Android

Install for Microsoft Edge
Install for Opera


  • What is Privacy Badger?
  • How is Privacy Badger different from Disconnect, Adblock Plus, Ghostery, and other blocking extensions?
  • How does Privacy Badger work?
  • What is a third party tracker?
  • What do the red, yellow and green sliders in the Privacy Badger menu mean?
  • Why does Privacy Badger block ads?
  • Why doesn't Privacy Badger block all ads?
  • What about tracking by the sites I actively visit, like or
  • Does Privacy Badger contain a list of blocked sites?
  • How was the cookie blocking yellowlist created?
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  • Does Privacy Badger consider every cookie to be a tracking cookie?
  • Does Privacy Badger account for a cookie that was used to track me even if I deleted it?
  • Does Privacy Badger still work when blocking third-party cookies in the browser?
  • Will you be supporting any other browsers besides Chrome, Firefox, Edge and Opera?
  • Can I download Privacy Badger outside of the Chrome Web Store?
  • Where can I find general information about Privacy Badger that I can use for a piece I'm writing?
  • I am an online advertising / tracking company. How do I stop Privacy Badger from blocking me?
  • What is the Privacy Badger license? Where is the Privacy Badger source code?
  • How can I support Privacy Badger?
  • How does Privacy Badger handle social media widgets?
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  • Is Privacy Badger compatible with other extensions, including adblockers?
  • Is Privacy Badger compatible with Firefox's built-in content blocking?
  • Why does my browser connect to IP addresses on startup after installing Privacy Badger?
  • Why does Privacy Badger need access to my data for all websites?
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Privacy Badger is a browser add-on that stops advertisers and other third-party trackers from secretly tracking where you go and what pages you look at on the web. If an advertiser seems to be tracking you across multiple websites without your permission, Privacy Badger automatically blocks that advertiser from loading any more content in your browser. To the advertiser, it’s like you suddenly disappeared.


How is Privacy Badger different from Disconnect, Adblock Plus, Ghostery, and other blocking extensions?

Privacy Badger was born out of our desire to be able to recommend a single extension that would automatically analyze and block any tracker or ad that violated the principle of user consent; which could function well without any settings, knowledge, or configuration by the user; which is produced by an organization that is unambiguously working for its users rather than for advertisers; and which uses algorithmic methods to decide what is and isn’t tracking. Although we like Disconnect, Adblock Plus, Ghostery and similar products, none of them are exactly what we were looking for. In our testing, all of them required some custom configuration to block non-consensual trackers. Several of these extensions have business models that we weren’t entirely comfortable with. And EFF hopes that by developing rigorous algorithmic and policy methods for detecting and preventing non-consensual tracking, we’ll produce a codebase that could in fact be adopted by those other extensions, or by mainstream browsers, to give users maximal control over who does and doesn’t get to know what they do online.

How does Privacy Badger work?

When you view a webpage, that page will often be made up of content from many different sources. (For example, a news webpage might load the actual article from the news company, ads from an ad company, and the comments section from a different company that’s been contracted out to provide that service.) Privacy Badger keeps track of all of this. If as you browse the web, the same source seems to be tracking your browser across different websites, then Privacy Badger springs into action, telling your browser not to load any more content from that source. And when your browser stops loading content from a source, that source can no longer track you. Voila!

At a more technical level, Privacy Badger keeps note of the “third party” domains that embed images, scripts and advertising in the pages you visit. Privacy Badger looks for tracking techniques like uniquely identifying cookies, local storage “supercookies,” first to third party cookie sharing via image pixels, and canvas fingerprinting. If it observes a single third-party host tracking you on three separate sites, Privacy Badger will automatically disallow content from that third-party tracker.

In some cases a third-party domain provides some important aspect of a page’s functionality, such as embedded maps, images, or stylesheets. In those cases Privacy Badger will allow connections to the third party but will screen out its tracking cookies and referrers (these hosts have their sliders set to the middle, “cookie block” position).

What is a third party tracker?

When you visit a webpage parts of the page may come from domains and servers other than the one you asked to visit. This is an essential feature of 比特加速器修改vip时长. On the modern Web, embedded images and code often use cookies and other methods to track your browsing habits — often to display advertisements. The domains that do this are called “third party trackers”, and you can read more about how they work here.


The colors mean the following:

Green means there’s a third party domain, but it hasn’t yet been observed tracking you across multiple sites, so it might be unobjectionable. When you first install Privacy Badger every domain will be in this green state but as you browse, domains will quickly be classified as trackers.

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Red means that content from this third party tracker has been completely disallowed.

Privacy Badger analyzes each third party’s behavior over time, and picks what it thinks is the right setting for each domain, but you can adjust the sliders if you wish.

Why does Privacy Badger block ads?

Actually, nothing in the Privacy Badger code is specifically written to block ads. Rather, it focuses on disallowing any visible or invisible “third party” scripts or images that appear to be tracking you even though you specifically denied consent by sending a Do Not Track header. It just so happens that most (but not all) of these third party trackers are advertisements. When you see an ad, the ad sees you, and can track you. Privacy Badger is here to stop that.

Why doesn't Privacy Badger block all ads?

Because Privacy Badger is primarily a privacy tool, not an ad blocker. Our aim is not to block ads, but to prevent non-consensual invasions of people’s privacy because we believe they are inherently objectionable. We also want to create incentives for advertising companies to do the right thing. Of course, if you really dislike ads, you can also install a traditional ad blocker.

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At present, Privacy Badger primarily protects you against tracking by third party sites. As far as privacy protections for “first party” sites (sites that you visit directly), Privacy Badger removes outgoing link click tracking on Facebook and Google. We plan on adding more first party privacy protections in the future.

We are doing things in this order because the most scandalous, intrusive and objectionable form of online tracking is that conducted by companies you’ve often never heard of and have no relationship with. First and foremost, Privacy Badger is there to enforce Do Not Track against these domains by providing the technical means to restrict access to their tracking scripts and images. The right policy for whether, or can track you when you visit that site – and the technical task of preventing it – is more complicated because often (though not always) tracking is interwoven with the features the site offers, and sometimes (though not always) users may understand that the price of an excellent free tool like Google’s search engine is measured in privacy, not money.

Does Privacy Badger contain a list of blocked sites?

Unlike other blocking tools like AdBlock Plus, we have not made decisions about which sites to block, but rather about which behavior is objectionable. Domains will only be blocked or screened if the Privacy Badger code inside your browser actually observes the domain collecting unique identifiers after it was sent a Do Not Track message.

Privacy Badger 比特加速器修改vip时长 contain a “yellowlist” of some sites that are known to provide essential third party resources; those sites show up as yellow and have their cookies blocked rather than being blocked entirely. This is a compromise with practicality, and in the long term we hope to phase out the yellowlist as these third parties begin to explicitly commit to respecting Do Not Track. The criteria for including a domain on the yellowlist can be found here.


The initial list of domains that should be cookie blocked rather than blocked entirely was derived from a 比特加速器修改vip时长 on classifying third party domains as trackers and non-trackers. We will make occasional adjustments to it as necessary. If you find domains that are under- or over-blocked, please file a bug on Github.

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Browser fingerprinting is an extremely subtle and problematic method of tracking, which we documented with the Panopticlick project. Privacy Badger can detect canvas based fingerprinting, and will block third party domains that use it. Detection of other forms of fingerprinting and protections against first-party fingerprinting are ongoing projects. Of course, once a domain is blocked by Privacy Badger, it will no longer be able to fingerprint you. No. Privacy Badger analyzes the cookies from each site; unique cookies that contain tracking IDs are disallowed, while “low entropy” cookies that perform other functions are allowed. For instance a cookie like LANG=fr that encodes the user’s language preference, or a cookie that preserves a very small amount of information about ads the user has been shown, would be allowed provided that individual or small groups of users’ reading habits could not be collected with them. We have a 比特加速器修改vip时长 implementation of this; pull requests are welcome. Yes. Privacy Badger keeps track of cookies that could be used to track you and where they came from, even if you frequently clear your browser’s cookies.

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When you tell your browser to deny third-party cookies, Privacy Badger still gets to learn from third parties trying to set cookies via HTTP headers (as well as from other tracking techniques such as 比特加速器修改vip时长 and canvas fingerprinting). Privacy Badger no longer gets to learn from cookies or HTML5 local storage being set via JavaScript, however. So, Privacy Badger still works, it’ll just learn to block fewer trackers. Clearing history or already-set cookies shouldn’t have any effect on Privacy Badger.


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Chrome on Android does not support extensions.

If you would like to help us port Privacy Badger to other platforms, please let us know!

Can I download Privacy Badger outside of the Chrome Web Store?

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Where can I find general information about Privacy Badger that I can use for a piece I'm writing?

Glad you asked! Check out this downloadable press kit that we’ve put together.

I am an online advertising / tracking company. How do I stop Privacy Badger from blocking me?

One way is to stop tracking third party users who have turned on the Do Not Track header (i.e., stop collecting cookies, supercookies or fingerprints from them). That will work for new Privacy Badger installs.

If copies of Privacy Badger have already blocked your domain, you can unblock yourself by promising to respect the Do Not Track header in a way that conforms with the user’s privacy policy. You can do that by posting a specific compliant DNT policy to the URL, where “” is all of your DNT-compliant domains. Note that the domain must support HTTPS, to protect against tampering by network attackers. The path contains “.well-known” per RFC 5785.

Privacy Badger currently checks for this specific verbatim policy document, though in the future Privacy Badger may allow content from sites that post different versions of a 比特加速器修改vip时长, and that there may be ways for users to specify their own acceptable DNT policies if they wish to.

What is the Privacy Badger license? Where is the Privacy Badger source code?

Privacy Badger is GPLv3 code. You can find Privacy Badger on GitHub. There is a development mailing list. Privacy Badger is governed by EFF’s Privacy Policy for Software.

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Thanks for asking! Individual donations make up about half of EFF’s support, which gives us the freedom to work on user-focused projects. If you want to support the development of Privacy Badger and other projects like it, helping build a more secure Internet ecosystem, you can throw us a few dollars here. Thank you.

If you want to help directly with the project, we appreciate that as well. Please see Privacy Badger’s CONTRIBUTING document for ways to get started.


Social media widgets (such as the Facebook Like button, Twitter Tweet button, or Google +1 button) often track your reading habits. Even if you don’t click them, the social media companies often see exactly which pages you’re seeing the widget on. Privacy Badger includes a feature imported from the ShareMeNot project which is able to replace the widgets with a stand-in version, so that you can still see and click them. You will not be tracked by these replacements unless you explicitly choose to click them. Privacy Badger currently knows how to replace the following widgets if they are observed tracking you: AddThis, Facebook, Google, LinkedIn, Pinterest, Stumbleupon, and Twitter. (The source code for these replacements is here; pull requests are welcome.)

Note that Privacy Badger will not replace social media widgets unless it has blocked the associated tracker. If you’re seeing real social media widgets, it generally means that Privacy Badger hasn’t detected tracking from that variant of the widget, or that the site you’re looking at has implemented its own version of the widget. To avoid confusion, the replacement widgets are marked with the Privacy Badger badge next to the button. To interact with a replacement widget, simply click on it. Depending on the widget, Privacy Badger will either send you directly to the appropriate sharing page (for example, to post a tweet) or it will enable and load the real social widget (for example, the Facebook Like button, with personalized information about how many of your friends have “liked” the page). In the second case, you will still need to interact with the real widget to “like” or share the page.


Firefox: See the Disable or remove Add-ons Mozilla help page.

Chrome: See the 比特加速器修改vip时长 Chrome Web Store help page.

Edge: See the Add or remove browser add-ons, extensions, and toolbars Microsoft help page.

Opera: Click the menu button in the top left of the window, and then click “Extensions” and then “Manage Extensions.” Scroll until you see Privacy Badger, move your mouse over it, and then click the “X” icon in the upper right. Click “OK” to confirm removal. You can then safely close the Extensions tab.

Is Privacy Badger compatible with other extensions, including adblockers?

Privacy Badger should be compatible with other extensions.

While there is likely to be overlap between the various advertising/tracker lists and Privacy Badger, Privacy Badger can automatically discover new trackers that list-based blockers don’t know about.

Besides automatic learning, Privacy Badger comes with other advantages like cookie blocking, widget replacement, and Facebook/Google link cleaning.

Some extension-specific notes:

Adblock Plus does not block invisible trackers by default.

uBlock Origin is an excellent privacy tool. uBlock Origin and Privacy Badger should work well together. Similarly to adblockers, uBlock Origin protects using manually curated blocklists. Privacy Badger protects by automatically learning about trackers as you browse. This means Privacy Badger might catch things that uBlock Origin doesn’t know about. (Privacy Badger will learn about far fewer trackers when used together with uBlock Origin, but that’s OK.)

Is Privacy Badger compatible with Firefox's built-in content blocking?

It’s fine to use Firefox’s native content blocking and Privacy Badger together.

While there is overlap between Firefox’s tracker lists and Privacy Badger’s protections, unlike list-based blockers, Privacy Badger automatically discovers trackers as you browse the Web. This means your Privacy Badger can learn to block tracking that list-based blockers don’t know about.

See also the following FAQ entries:

Is Privacy Badger compatible with other extensions, including adblockers?

Does Privacy Badger still work when blocking third-party cookies in the browser?

Why does my browser connect to IP addresses on startup after installing Privacy Badger?

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Why does Privacy Badger need access to my data for all websites?

When you install Privacy Badger, your browser warns that Privacy Badger can “access your data for all websites” (in Firefox, or “read and change all your data on the websites you visit” in Chrome). You are right to be alarmed. You should only install extensions made by organizations you trust.

Privacy Badger requires these permissions to do its job of automatically detecting and blocking trackers on all websites you visit. We are not ironically (or unironically) spying on you. For more information, see our Privacy Badger extension permissions explainer.

Note that the extension permissions warnings only cover what the extension has access to, not what the extension actually does with what it has access to (such as whether the extension secretly uploads your browsing data to its servers). Privacy Badger will never share data about your browsing unless you choose to share it (by filing a broken site report). For more information, see EFF’s Privacy Policy for Software.

I need help! I found a bug! What do I do now?

To get help or to report bugs, please email If you have a GitHub account, you can use our GitHub issue tracker.