Why does Privacy Badger block ads?Īctually, nothing in the Privacy Badger code is specifically written to block ads. 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. Red means that content from this third party tracker has been completely disallowed. In that case, Privacy Badger will load content from the domain but will try to screen out third party cookies and referrers from it. Yellow means that the third party domain appears to be trying to track you, but it is on Privacy Badger’s cookie-blocking “yellowlist” of third party domains that, when analyzed, seemed to be necessary for Web functionality.
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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. 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. What do the red, yellow and green sliders in the Privacy Badger menu mean? The domains that do this are called “third party trackers”, and you can read more about how they work here. On the modern Web, embedded images and code often use cookies and other methods to track your browsing habits - often to display advertisements.
This is an essential feature of hypertext. When you visit a webpage parts of the page may come from domains and servers other than the one you asked to visit. 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). In some cases a third-party domain provides some important aspect of a page’s functionality, such as embedded maps, images, or stylesheets. 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. 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. Voila!Īt a more technical level, Privacy Badger keeps note of the “third party” domains that embed images, scripts and advertising in the pages you visit. And when your browser stops loading content from a source, that source can no longer track you. 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. (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. When you view a webpage, that page will often be made up of content from many different sources. 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. Several of these extensions have business models that we weren’t entirely comfortable with.
In our testing, all of them required some custom configuration to block non-consensual trackers. Although we like Disconnect, Adblock Plus, Ghostery and similar products, none of them are exactly what we were looking for. 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. How is Privacy Badger different from Disconnect, Adblock Plus, Ghostery, and other blocking extensions? To the advertiser, it’s like you suddenly disappeared. 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. 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.
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