AdTech Mirror

See what advertising/tracking scripts observe about you. Passive, local-only logging of fingerprinting attempts, third-party trackers, and cookie syncing — with a built-in report dashboard.

Installera detta skript ?

Ask a question, post a review, or report the script.

Upphovsman: FixLit Zxan
Dagliga installationer: 1
Totala installationer: 5
Betyg: 0 0 0
Version: 1.0
Skapad: 2026-06-13
Uppdaterad: 2026-06-13
Size: 43,7 KB
Licens: MIT
Gäller för: Alla sidor

AdTech Mirror — See What Trackers See

AdTech Mirror passively watches what advertising and analytics scripts try to learn about you as you browse, and turns it into a plain-language report — entirely on your own device. Nothing is ever sent anywhere.

What It Detects

Third-party trackers — flags requests to ~50 known ad networks, ad exchanges, SSPs/DSPs, data management platforms, identity-resolution services, and data brokers (Google/DoubleClick, Meta Pixel, TikTok Pixel, Amazon Advertising, The Trade Desk, PubMatic, Magnite, Criteo, Adobe Audience Manager, Oracle BlueKai, LiveRamp, ID5, FingerprintJS, and many more), categorized by type.
Browser fingerprinting — detects when scripts try to fingerprint your device via Canvas rendering, WebGL/GPU parameters, AudioContext processing, font enumeration, the Battery API, and sensitive navigator properties (hardware concurrency, device memory, languages, etc.).
ID syncing — flags requests where tracking IDs appear to be shared between ad companies behind the scenes ("cookie syncing"), a key mechanism for linking your identity across services.
Cross-site identity linking — shows which trackers followed you across multiple different sites, indicating they could be building a unified profile of your browsing.
Outbound link leakage — notes when clicking a link sends your referrer/page info to an ad/tracking domain.

The Dashboard

A small floating button (🛰️) opens a report showing:

Summary stats (sites visited, days logged, unique trackers, fingerprint attempts, ID syncs)
Top trackers ranked by frequency and number of sites they appeared on
A breakdown of which fingerprinting techniques were used and how often
A "synthetic profile" section that explains, in plain English, what a composite tracker-built profile of you might look like based on the data collected
An activity timeline
Export everything to JSON or CSV, or clear all data with one click

Privacy

All data is stored locally in your browser's IndexedDB (90-day auto-pruning). The script makes no network requests of its own and sends no data anywhere — it only observes traffic and API calls your browser is already making as you browse normally.

Use Cases

Understand, with real evidence from your own browsing, how much of the "surveillance economy" touches your daily life
Identify which sites are heaviest with trackers before deciding whether to use them
Educational tool for learning how RTB, fingerprinting, and ad-tech data flows actually work in practice

Notes

The tracker domain list is not exhaustive and may need updates as ad-tech vendors change. This is a passive observation tool — it does not block anything (pair it with uBlock Origin if you also want blocking). Works best if left running for at least a week or two of normal browsing before checking the report and this script is NOT perfect.