Privacy extension ratings

Extensions that add privacy and security features to a browser.

28 browser extensions are rated against 4 public criteria, and 28 have enough evidence for a letter grade. Of the 7 with a known jurisdiction, 5 are based in a Five Eyes country, and 7 in the wider Fourteen Eyes.

Open-source browser extensions only · Criteria for this category · Suggest an addition · Markdown

Browser extensions privacy ratings, sorted by pick and then by grade
Name	Grade	Score	Data	Jurisdiction	Open source	No trackers or telemetry	No ads or data sales	Independent audit
CanvasBlocker Firefox extension that blocks or fakes the output of canvas and other JavaScript APIs that websites use for browser fingerprinting.	Grade B	80	100%	–	Yes	Yes	Yes	No
Chameleon 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.	Grade B	80	100%	–	Yes	Yes	Yes	No
ClearURLs Browser extension that removes tracking parameters from URLs and skips tracking redirects using a public rule list.	Grade B	80	100%	–	Yes	Yes	Yes	No
Consent-O-Matic 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.	Grade B	80	100%	Denmark Nine Eyes	Yes	Yes	Yes	No
Cookie AutoDelete Browser extension that deletes cookies and other site data from closed tabs automatically, keeping data only for sites on a user-defined allow list.	Grade B	80	100%	–	Yes	Yes	Yes	No
DeArrow Crowdsourced browser extension that replaces YouTube video titles and thumbnails with community-submitted versions to reduce clickbait.	Grade B	80	100%	–	Yes	Yes	Yes	No
Decentraleyes Browser extension that serves common JavaScript libraries from local copies instead of third-party content delivery networks, reducing tracking by those CDNs.	Grade B	80	100%	–	Yes	Yes	Yes	No
Facebook Container 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.	Grade B	80	100%	United States Five Eyes	Yes	Yes	Yes	No
Firefox Multi-Account Containers Mozilla add-on for Firefox that separates sites into color-coded container tabs with isolated cookies and storage.	Grade B	80	100%	United States Five Eyes	Yes	Yes	Yes	No
I Still Don't Care About Cookies Community-maintained fork of I Don't Care About Cookies, a browser extension that hides or dismisses cookie consent banners on websites.	Grade B	80	100%	–	Yes	Yes	Yes	No
JShelter 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.	Grade B	80	100%	–	Yes	Yes	Yes	No
LibRedirect Browser extension that redirects sites such as YouTube, Reddit and Twitter to alternative frontends.	Grade B	80	100%	–	Yes	Yes	Yes	No
Linguist Browser extension for translating web pages and text, with an offline translator and support for custom or self-hosted translation services.	Grade B	80	100%	–	Yes	Yes	Yes	No
LocalCDN Browser extension that emulates common web frameworks such as jQuery and Bootstrap from local copies, blocking requests to third-party CDNs.	Grade B	80	100%	–	Yes	Yes	Yes	No
NoScript 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.	Grade B	80	100%	–	Yes	Yes	Yes	No
Privacy Badger 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.	Grade B	80	100%	United States Five Eyes	Yes	Yes	Yes	No
Privacy-Oriented Origin Policy 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.	Grade B	80	100%	–	Yes	Yes	Yes	No
PrivacySpy Companion extension for PrivacySpy, an open project that rates and annotates privacy policies; it shows the PrivacySpy score for the current website.	Grade B	80	100%	–	Yes	Yes	Yes	No
Skip Redirect Browser extension that detects intermediary redirect pages, extracts the final URL and goes there directly.	Grade B	80	100%	–	Yes	Yes	Yes	No
Terms of Service; Didn't Read 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.	Grade B	80	100%	–	Yes	Yes	Yes	No
Web Archives Browser extension that looks up archived and cached copies of the current page on services such as the Wayback Machine and Archive.today.	Grade B	80	100%	–	Yes	Yes	Yes	No
WebRTC-Leak-Prevent Chromium extension that changes WebRTC privacy settings to stop WebRTC from exposing local and public IP addresses.	Grade B	80	100%	–	Yes	Yes	Yes	No
SponsorBlock Crowdsourced browser extension that skips sponsored segments and other unwanted parts of YouTube videos using community-submitted timestamps.	Grade C	65	100%	–	Yes	Partial	Yes	No
AmIUnique Timeline Research extension from the AmIUnique project that periodically records the browser's fingerprint so users can see how it changes over time.	Grade D	50	100%	France Nine Eyes	Yes	No	Yes	No
Flagfox Firefox extension that shows a flag for the country where the current website's server is located, with shortcuts to lookup tools such as whois and site checks.	Grade D	40	100%	–	Yes	No	Partial	No
Privacy Essentials DuckDuckGo browser extension that blocks trackers, upgrades connections to HTTPS and sets DuckDuckGo as the search engine.	Grade D	40	100%	United States Five Eyes	Yes	No	Partial	No
Canvas Fingerprint Blocker Browser extension that adds noise to HTML5 canvas output to resist canvas fingerprinting without disabling the canvas element.	Grade F	30	100%	–	Yes	No	No	No
Netcraft Extension Anti-phishing browser extension from Netcraft that warns about known and suspected phishing sites and malicious JavaScript, and shows basic information about the current site.	Grade F	20	100%	United Kingdom Five Eyes	No	No	Yes	No

Questions

What is the most private option among browser extensions?

No pick has been made yet. The table above is sorted by score, based on public evidence.

How are browser extensions rated?

Each entry answers 4 questions: open source, no trackers or telemetry, no ads or data sales and independent audit. Answers need links to evidence. See the full criteria.

Does jurisdiction matter?

Jurisdiction decides which laws can compel a provider to hand over data. Each entry shows its country and whether it is in the Five, Nine or Fourteen Eyes. The data a provider can hand over depends mostly on what it stores and who holds the keys. Read about jurisdictions and the CLOUD Act.