Privacy Badger

Privacy Badger is a tracker-blocking extension made by the Electronic Frontier Foundation that learns to block trackers from observed behaviour rather than from a curated list. As of May 2026, it's the strongest complement to uBlock Origin for catching new or obscure trackers — it doesn't block ads, but it catches cross-site tracking patterns that list-based blockers miss in the gap between a tracker appearing in the wild and being added to a public block list.

At a glance

Field	Value
Pricing	Free, open source
Developer	Electronic Frontier Foundation (EFF)
Platforms	Chrome, Firefox, Edge
Blocks	Cross-site tracking scripts and pixels
Does not block	Ads
Last verified by FeedCutter	May 25, 2026

What Privacy Badger does well

• Behavioural detection. Privacy Badger doesn’t work from a list of known bad domains. It watches which third-party scripts load across multiple unrelated websites. If the same tracker appears on three or more unrelated sites you visit, Badger starts blocking it. This means it catches trackers that aren’t on any public list yet.
• EFF pedigree. The Electronic Frontier Foundation has been the most credible independent advocate for digital civil liberties since 1990. Privacy Badger is their engineering answer to the tracking economy. There is no commercial relationship with any tracker or ad network — the funding model is donations.
• Per-domain granularity. The extension panel shows a slider for every third-party domain on the current page: green (allow), yellow (block tracking pixels but allow the domain to load), red (block entirely). You can adjust per domain if a block breaks something.
• Chrome MV3 complete. Unlike uBlock Origin, Privacy Badger has fully completed its Chrome MV3 transition as of 2026. It runs at the same capability level on Chrome and Firefox.
• Non-conflicting. Privacy Badger and uBlock Origin solve the problem from different angles. Running both catches more than either alone.

What Privacy Badger doesn’t do

• Block ads. This is deliberate. Privacy Badger only blocks tracking — it won’t remove an ad that isn’t tracking you cross-site. You still need uBlock Origin (or equivalent) for ad blocking.
• Instant protection. The learning model starts empty. In the first days after install, Privacy Badger has observed almost nothing and will block very little. It gets progressively more aggressive as you browse. If you want immediate protection, start with uBlock Origin; Badger complements it over time.
• Block all trackers. List-based blockers like uBlock Origin block every known bad domain immediately. Privacy Badger only blocks what it has personally observed. Some trackers operate below the threshold (appear on fewer than three sites) and pass through indefinitely.

Best for

Users who already run uBlock Origin and want the next layer — catching trackers that lists miss. Also the right choice for anyone who wants the simplest, most trustworthy single-brand privacy stack and doesn’t mind also installing it for ad blocking separately. The EFF association matters: for users who would read and trust an EFF policy analysis, Privacy Badger earns institutional trust that commercially-backed extensions don’t.

Setup in 2 minutes

1. Install from Chrome Web Store or Firefox Add-ons.
2. Browse normally. Privacy Badger’s learning model builds in the background.
3. (Optional) Open the extension panel on any page and review the per-domain sliders.

No configuration required at install time. The default settings are appropriate for almost all users.

What this does for Reddit

Privacy Badger blocks Reddit’s ad network trackers from following you to other websites. Reddit uses several third-party analytics and ad-serving scripts that build a profile of your browsing activity across sites. Badger learns to block these after observing them.

The trade-off: Privacy Badger won’t block the promoted post ads you see inside Reddit — for that, use uBlock Origin. Badger handles what happens after you leave Reddit. uBlock Origin handles what you see while you’re there.

Pairing with other tools

The most effective privacy stack as of 2026:

• uBlock Origin — blocks all known ads and trackers from curated lists, immediately after install.
• Privacy Badger — adds behavioural detection, catching trackers that haven’t made it onto lists yet.

These two cover the browser-level privacy layer comprehensively. They don’t conflict. Memory overhead for both combined is under 60MB.

For Reddit content filtering (what you see, not who sees you), add Ultimate Reddit Filter.

Alternatives

• uBlock Origin — broader blocking (ads + trackers), list-based, lower memory. The default first install for most people. Privacy Badger is a complement, not a replacement.
• DuckDuckGo Privacy Essentials — simpler single-extension approach with integrated private search. Less technical; less granular.