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A web browser extension that emulates Content Delivery Networks to improve your online privacy. It intercepts traffic, finds supported resources locally, and injects them into the environment. All of this happens automatically, so no prior configuration is required. Feel free to use the following testing utility to find out if you are properly protected.

Note: Decentraleyes is no silver bullet, but it does prevent a lot of websites from making you send these kinds of requests. Ultimately, you can make Decentraleyes block requests for any missing CDN resources, too.

Contributing Code

Suggestions in the form of Issues, and contributions in the form of Pull Requests, are highly welcome. You can also use the public contact details and PGP key on the extension's contact page to get in touch.


  • Mozilla Firefox 56 (or higher).

Note: If you want to contribute to the Firefox legacy extension, please check out the legacy branch. If you are looking for the Chromium-compatible codebase, please see the experimental branch.

Running the Code

Please read this short guide for information on how to run this extension from source.

Important: All commits since 26 October 2016 are signed with GPG. It's likely best to ignore unsigned commits, unless you really know what you're doing. Please send an email if you have any questions or security concerns.

Submitting Translations

Do you master a non-supported language? Please help out by translating this add-on on Crowdin.



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