Privacy Transparency Tool

See What Your Browser Reveals — In Seconds

Most websites can observe more about your browser than you might expect. JExtScanner shows you which of your installed extensions may be detectable — and how that contributes to your browser fingerprint.

Takes under 10 seconds
100% client-side processing
No tracking, no uploads, no storage

Why This Matters

Your browser setup can act as a unique identifier. Even without cookies, websites may infer:

Which Extensions You Use

Installed extensions can be detected through exposed resources, revealing your tools and habits.

Your Device Characteristics

Browser version, screen size, hardware specs, and OS details all contribute to your fingerprint.

Fingerprinting SignalsThe unique combination of browser extensions you install can make your browser highly identifiable, allowing trackers to create a persistent, unique identifier—or fingerprint—across websites. Having three or more detectable extensions can make your fingerprint unique with over 99% accuracy, functioning as a “shadow” that follows you even when clearing cookies or using private mode.

The more unique your setup, the easier it may be to recognize your browser across sessions.

What JExtScanner Shows You

After scanning, you'll see:

Detectable Extensions

Which of your extensions may be visible to websites through web-accessible resources.

Your Fingerprint

How your browser contributes to fingerprinting based on your extension profile and device data.

Exposure Level

Where your exposure may be higher than expected. This turns invisible browser behavior into something you can understand.

Run a Free Scan

No installs. No data collection. Runs entirely in your browser.

Platforms & Techniques

Security research has demonstrated that modern websites can interact with browser environments in advanced ways, including extension detection and fingerprinting. Techniques and scope vary by platform.

LinkedIn

HIGH RISK
Scans 6,000+ extensions
Technique: Web Accessible Resources probing via hidden iframe/fetch
Data Collected:
  • Installed browser extensions
  • Extension version numbers
  • Browser type and version
  • Screen resolution
  • Device type
  • OS information
  • Canvas fingerprint
Full Details

Research has reported that LinkedIn injects JavaScript that systematically probes chrome-extension:// URLs for thousands of known extensions. It reportedly checks for web-accessible resources (icons, CSS files) exposed by extensions. Detection is reported to occur silently during normal page browsing via their tracking scripts.

Facebook / Meta

HIGH RISK
Scans 2,500+ extensions
Technique: DOM injection detection + resource timing
Data Collected:
  • Installed extensions
  • Ad blocker detection
  • Browser fingerprint
  • Device hardware info
  • Network information
Full Details

Facebook reportedly uses multiple techniques including checking for DOM modifications made by extensions (especially ad blockers) and resource timing attacks to detect installed extensions.

X (Twitter)

MEDIUM RISK
Scans 1,200+ extensions
Technique: Resource timing + fetch probing
Data Collected:
  • Installed extensions
  • Browser type
  • Device fingerprint
  • Ad blocker status
Full Details

X has been reported to use resource timing side-channel attacks and fetch-based probing to detect browser extensions, particularly ad blockers and privacy tools.

Instagram

MEDIUM RISK
Scans 2,000+ extensions
Technique: Meta Pixel + DOM fingerprinting
Data Collected:
  • Installed extensions
  • Browser configuration
  • Device type
  • Screen properties
Full Details

As part of the Meta ecosystem, Instagram reportedly shares similar extension detection infrastructure as Facebook, scanning for privacy and ad-blocking tools.

YouTube

HIGH RISK
Scans 3,000+ extensions
Technique: DOM mutation observer + extension resource probing
Data Collected:
  • Ad blocker extensions
  • Video download extensions
  • Browser fingerprint
  • Device information
Full Details

YouTube has been reported to actively detect ad-blocking extensions through DOM mutation observers and has started blocking users with detected ad blockers. It also reportedly probes for video download and enhancement extensions.

TikTok

MEDIUM RISK
Scans 800+ extensions
Technique: Canvas fingerprinting + extension probing
Data Collected:
  • Installed extensions
  • Device fingerprint
  • Browser configuration
  • Hardware concurrency
Full Details

TikTok has been reported to employ canvas fingerprinting combined with extension resource probing to build detailed browser profiles of visitors.

Reduce Your Exposure

Simple steps can improve your privacy. Understanding what your browser exposes is the first step toward controlling it.

Reduce Your Exposure

Remove unused extensions. Fewer extensions means a smaller fingerprint and less to detect.

Effectiveness: HIGH

Use Separate Profiles

Create separate browser profiles: one with minimal extensions for general browsing and one for daily work.

Effectiveness: HIGH

Disable When Not Needed

Toggle extensions off when visiting sites where you want to minimize your browser footprint.

Effectiveness: MEDIUM

Privacy-Focused Browsers

Some browsers offer stronger isolation and protections against certain extension detection techniques.

Effectiveness: MEDIUM

Use Incognito Mode

Extensions are disabled by default in incognito/private mode. Only enable specific extensions you need for that session.

Effectiveness: HIGH

Be Aware

Understanding what your browser exposes is the first step toward controlling it. Run regular scans to stay informed.

Effectiveness: ESSENTIAL