Privacy extensions can dramatically reduce online tracking — but there are dozens of them and their descriptions often overlap. Here is a practical breakdown of the best options and what each one actually does.
1. uBlock Origin
Blocks ads, trackers, malware domains, and cryptominers using community-maintained filter lists. Open source, lightweight, and does not sell ad exceptions. Install this first — it is essential for Chrome, Firefox, and Edge.
2. Privacy Badger (EFF)
Learns to block invisible trackers based on behavior rather than a blocklist. If a third-party domain tracks you across multiple sites without legitimate purpose, Privacy Badger blocks it automatically. Pairs well with uBlock Origin.
3. Cookie AutoDelete
Automatically deletes cookies from websites you have closed. Whitelist sites where you want to stay logged in. Prevents long-term cookie tracking without manually clearing cookies after every session.
4. Canvas Blocker and JShelter
Blocks or randomizes canvas fingerprinting — one of the most common browser tracking techniques. Also handles WebGL and AudioContext fingerprinting APIs. Available as Canvas Blocker on Firefox and JShelter on Chrome.
5. Bitwarden
A free, open-source password manager that generates strong unique passwords for every site. Using unique passwords per site is the single most impactful security step you can take. Available on Chrome, Firefox, Edge, and Safari.
The Anonymiz Extension
The Anonymiz browser plugin adds one-click referrer stripping. When you share a link, it removes the HTTP referrer header so the destination site cannot see where you came from. Available for Chrome and Firefox.
Why uBlock Origin and Privacy Badger Aren't Redundant
uBlock Origin blocks known trackers using community-maintained blocklists — effective against anything already catalogued, but blind to new or obscure trackers not yet added to a list. Privacy Badger works the opposite way: it doesn't use a blocklist at all, instead watching behavior in real time and blocking any third-party domain it observes tracking you across multiple sites. Running both together covers each other's blind spot — known threats via the list, unknown ones via behavioral detection.
What Browser Extensions Genuinely Can't Protect Against
Extensions operate entirely within the browser, which means they have no visibility into or control over what your ISP or network operator can see at the DNS and connection level — every domain you visit is still resolvable by your ISP through your DNS queries, regardless of how well an extension blocks in-page trackers. For that layer of privacy, a separate DNS-level or network-level tool (an encrypted DNS resolver or a VPN) addresses a genuinely different threat model than browser extensions do.
Recommended Setup
For most users: uBlock Origin (essential), Bitwarden (essential), Cookie AutoDelete (recommended), Privacy Badger (optional), and the Anonymiz Extension for link sharing privacy.
