Browser Anti‑Fingerprinting

How to Blind Trackers and Feed Them False Data

When I first started digging into browser‑level anti‑fingerprinting, I quickly realized that the problem isn’t just “someone can see my user‑agent string.” It’s an entire ecosystem of tiny data points—canvas hashes, timing quirks, font lists, hardware concurrency, even the way my mouse wiggles across the page—that, when combined, can paint a surprisingly precise portrait of who I am. In this Article – “Browser Anti‑Fingerprinting: How to Blind Trackers and Feed Them False Data” I will help you to explore what we are up against and what technical ways there are to help.

At the high‑to‑critical threat level, these fingerprints become weaponized: trackers can stitch together cross‑site identities, advertisers can serve hyper‑targeted ads, and malicious actors can tailor phishing lures that look exactly like the sites you trust. In the worst‑case scenario, a persistent fingerprint can survive cookie wipes, VPN switches, and even private‑browsing sessions, effectively turning your browser into a digital passport that follows you everywhere.

So, what can we do?

1. Blind the collector – strip away or randomize the signals before they ever leave your machine. This means disabling or “sandboxing” APIs that leak entropy (like Canvas, WebGL, AudioContext), normalizing timing sources, and feeding generic or deliberately noisy values for things like screen resolution, timezone, and language.
2. Feed false data – actively inject misleading fingerprints that break the correlation logic used by trackers. By presenting a rotating set of plausible yet inconsistent attributes (e.g., a changing hardware concurrency count or a shuffled font list), you force the adversary to chase a moving target, dramatically raising the cost of building a reliable profile.

In the sections that follow I’ll walk through the most effective technical knobs you can turn—both built‑in browser settings and third‑party extensions—and show how to combine them into a layered defense that keeps your fingerprint from becoming a permanent badge of your online identity.

1. The Core Threat Model (High → Critical)

Both browsers expose roughly the same surface area, but each offers its own knobs for mitigation. The goal is to reduce entropy (make the fingerprint less unique) and/or inject noise (feed false data).

2. Baseline Hardening – Settings You Can Flip in One Click

What a browser‑level fingerprint can “see”

Fingerprinting is basically a collection of tiny data points that, when combined, form a probabilistic identifier for a device or user.
Below is a practical inventory of everything a typical JavaScript‑based fingerprinting script can query (grouped by category).

1. Passive HTTP‑level clues (sent automatically with every request)

2. Active JavaScript‑derived properties (queried after the page loads)

3. Cross‑site aggregation

Even if a single site only sees a subset of the above, trackers combine data from many domains (via third‑party scripts, shared CDNs, or advertising networks). The more overlapping fields they collect, the higher the probability that the composite fingerprint is globally unique (often > 99 % uniqueness across the internet).

4. What can be blocked or masked?

Kill them with a custom DNS list

This is one way of stopping most f the traffic that uses commercial services. These are some of the “known” offenders of this technology. I encourage you to do some research on your own and when you do please comment down below so that I can include it (if you want credit that is fine or you can remain anonymous).

Here is a simple list that I am currently testing out:

Summary

We covered the whole toolbox you need to make a browser‑level anti‑fingerprinting strategy that works across Firefox, Chrome/Chromium while still keeping everyday sites (video‑chat, streaming, SaaS) functional. As you can see, the issue is complicated. Fortunately there are strategies that you can use to lessen the threat. By using plugins, settings, some custom scripts and DNS – You can do a lot to mitigate these problems. I will add to this post and update it as new information comes to light. Hit me up in the comments if you have any information.