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Open-source browser extensions

26 browser extensions whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

  1. CanvasBlocker Grade B

    Firefox extension that blocks or fakes the output of canvas and other JavaScript APIs that websites use for browser fingerprinting.

    MPL-2.0. Source code

  2. Chameleon Grade B

    Browser extension that spoofs the user agent, screen size, time zone, language and other browser properties, and can apply privacy-related Firefox settings to reduce fingerprinting.

    GPL-3.0. Source code

  3. ClearURLs Grade B

    Browser extension that removes tracking parameters from URLs and skips tracking redirects using a public rule list.

    LGPL-3.0. Source code

  4. Consent-O-Matic Grade B

    Browser extension from Aarhus University that detects cookie consent pop-ups from common consent management platforms and fills them in automatically according to the user's preferences.

    MIT. Source code

  5. Cookie AutoDelete Grade B

    Browser extension that deletes cookies and other site data from closed tabs automatically, keeping data only for sites on a user-defined allow list.

    MIT. Source code

  6. DeArrow Grade B

    Crowdsourced browser extension that replaces YouTube video titles and thumbnails with community-submitted versions to reduce clickbait.

    GPL-3.0 and LGPL-3.0. Source code

  7. Decentraleyes Grade B

    Browser extension that serves common JavaScript libraries from local copies instead of third-party content delivery networks, reducing tracking by those CDNs.

    MPL-2.0. Source code

  8. Facebook Container Grade B

    Firefox extension from Mozilla that isolates Facebook, Instagram and Messenger in a separate container so that Facebook cannot easily link activity on other websites to the user's account.

    MPL-2.0. Source code

  9. Firefox Multi-Account Containers Grade B

    Mozilla add-on for Firefox that separates sites into color-coded container tabs with isolated cookies and storage.

    MPL-2.0. Source code

  10. I Still Don't Care About Cookies Grade B

    Community-maintained fork of I Don't Care About Cookies, a browser extension that hides or dismisses cookie consent banners on websites.

    GPL-3.0. Source code

  11. JShelter Grade B

    Browser extension that limits what JavaScript on web pages can access, such as precise geolocation, timing and fingerprinting-prone APIs, and warns about sites that try to fingerprint the browser.

    GPL-3.0-or-later. Source code

  12. LibRedirect Grade B

    Browser extension that redirects sites such as YouTube, Reddit and Twitter to alternative frontends.

    GPL-3.0. Source code

  13. Linguist Grade B

    Browser extension for translating web pages and text, with an offline translator and support for custom or self-hosted translation services.

    BSD-3-Clause. Source code

  14. LocalCDN Grade B

    Browser extension that emulates common web frameworks such as jQuery and Bootstrap from local copies, blocking requests to third-party CDNs.

    MPL-2.0. Source code

  15. NoScript Grade B

    Browser extension for Firefox and Chromium-based browsers that blocks JavaScript and other active content except on sites the user allows, with added protection against cross-site scripting and clickjacking.

    GPL-3.0-or-later. Source code

  16. Privacy Badger Grade B

    Browser extension from the Electronic Frontier Foundation that learns to block invisible third-party trackers based on their behavior and sends Global Privacy Control signals.

    GPL-3.0. Source code

  17. Privacy-Oriented Origin Policy Grade B

    Firefox extension that strips Origin headers from cross-origin requests where they are least likely to be needed, to limit information sent to third parties.

    GPL-3.0. Source code

  18. PrivacySpy Grade B

    Companion extension for PrivacySpy, an open project that rates and annotates privacy policies; it shows the PrivacySpy score for the current website.

    GPL-3.0. Source code

  19. Skip Redirect Grade B

    Browser extension that detects intermediary redirect pages, extracts the final URL and goes there directly.

    MIT. Source code

  20. Terms of Service; Didn't Read Grade B

    Browser extension from the ToS;DR project that shows grades and summaries of a website's terms of service and privacy policy, written and reviewed by volunteer contributors.

    AGPL-3.0. Source code

  21. Web Archives Grade B

    Browser extension that looks up archived and cached copies of the current page on services such as the Wayback Machine and Archive.today.

    GPL-3.0. Source code

  22. WebRTC-Leak-Prevent Grade B

    Chromium extension that changes WebRTC privacy settings to stop WebRTC from exposing local and public IP addresses.

    Apache-2.0. Source code

  23. SponsorBlock Grade C

    Crowdsourced browser extension that skips sponsored segments and other unwanted parts of YouTube videos using community-submitted timestamps.

    GPL-3.0 and LGPL-3.0. Source code

  24. AmIUnique Timeline Grade D

    Research extension from the AmIUnique project that periodically records the browser's fingerprint so users can see how it changes over time.

    MIT. Source code

  25. Privacy Essentials Grade D

    DuckDuckGo browser extension that blocks trackers, upgrades connections to HTTPS and sets DuckDuckGo as the search engine.

    Apache-2.0. Source code

  26. Canvas Fingerprint Blocker Grade F

    Browser extension that adds noise to HTML5 canvas output to resist canvas fingerprinting without disabling the canvas element.

    Released under MPL-2.0 on the add-on listing; the source repository itself has no license file. Source code

Compare all 28 browser extensions, open source or not.