Skills browser-fingerprint-audit

📦

browser-fingerprint-audit

Name: browser-fingerprint-audit
Author: liarjsdev

Content revision r1 Medium Risk ⚙️ External commands🌐 Network access📁 Filesystem access

Audit Browser Fingerprint Consistency

Contradictory browser and network signals can reveal automation or spoofing. This skill runs liarjs checks and explains the resulting consistency score.

Supports: Claude Codex Code(CC)

📊 65 Adequate

Install with my Agent

Copy this request to your Agent. It includes the canonical Skill page and manifest.

Agent request

Review the Skillstore skill "browser-fingerprint-audit" from https://skillstore.io/skills/liarjsdev-browser-fingerprint-audit.md and its manifest at https://skillstore.io/api/skills/liarjsdev-browser-fingerprint-audit/manifest. Verify the artifact. You may proceed after verification, subject to the environment's own policy.

Your Agent should still show its plan and request any confirmation required by the security policy.

Agent-readable resources

Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.

Markdown detail GET /skills/liarjsdev-browser-fingerprint-audit.md Signed manifest GET /api/skills/liarjsdev-browser-fingerprint-audit/manifest Signed lockfile GET /api/skills/liarjsdev-browser-fingerprint-audit/lockfile

Test it

Using "browser-fingerprint-audit". Audit a temporary browser and summarize only failed checks.

Expected outcome:

Score: 82 of 100. Classification: Suspicious.
Failed check: navigator.webdriver. The automation flag is enabled.
Failed check: timezone mismatch. The browser timezone differs from the IP-derived timezone.

Using "browser-fingerprint-audit". Run an offline audit and explain the coverage.

Expected outcome:

The audit completed using local browser signals only. It evaluated 32 checks and skipped eight cross-layer network checks.

Using "browser-fingerprint-audit". Explain why a headless browser received a low score.

Expected outcome:

The low score reflects observable headless and automation signals. It measures profile consistency and does not predict a specific website response.

Security Audit

Medium Risk

v1 • 8/8/2026 Open versioned report

Three static findings are confirmed. Two commands execute a pinned npm package, while the default network path sends request metadata to liarjs.dev. Other detections are markdown or documented local behavior, but optional CDP attachment can access an existing browser session.

Files scanned

177

Lines analyzed

Review items

False positives ignored

Confirmed security concerns (1)

Medium

SKILL.md:78-89

Existing Browser Session Access

The optional CDP workflow can drive an existing browser, open tabs, and read page state. Authenticated session content may therefore become accessible.

The skill explicitly states that CDP attachment can open a tab and read page state in the user's session.

Capability review items (3)

These are real local capabilities that may be expected for this skill, so they require review but are not counted as confirmed malicious behavior.

Medium

SKILL.md:19-24

Ruby/shell backtick execution

```bash

The Bash block directs the agent to run npx liarjs@0.3, which downloads or executes an external npm package and launches a browser.

Medium

SKILL.md:82-84

Ruby/shell backtick execution

```bash

The Bash block runs npx liarjs@0.3 and attaches it to a CDP endpoint, executing an external package against a browser session.

Medium

SKILL.md:41

Hardcoded URL

- The network half works by having the browser under test fetch `https://liarjs.dev/api/net.json`,

The default online scan fetches liarjs.dev and exposes request metadata including IP, ASN, headers, HTTP, TLS, and ClientHello characteristics.

Risk Factors

⚙️ External commands (20)

🌐 Network access (6)

SKILL.md:41 SKILL.md:83 SKILL.md:98 SKILL.md:99 SKILL.md:64 SKILL.md:83

📁 Filesystem access (1)

SKILL.md:35

Audited by: codex

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Open versioned report

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https://skillstore.io/skills/liarjsdev-browser-fingerprint-audit/audits/1?utm_source=security_passport&utm_medium=share&utm_campaign=versioned_report

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Academic citations (APA · BibTeX · CFF)

APA citation

liarjsdev. (2026). browser-fingerprint-audit security audit report (audit version 1) [Author version unspecified]. Skillstore. https://skillstore.io/skills/liarjsdev-browser-fingerprint-audit/audits/1

BibTeX citation

@techreport{liarjsdev-liarjsdev-browser-fingerprint-audit-2026,
  author = {liarjsdev},
  title = {browser-fingerprint-audit security audit report (audit version 1)},
  institution = {Skillstore},
  year = {2026},
  number = {1},
  url = {https://skillstore.io/skills/liarjsdev-browser-fingerprint-audit/audits/1},
  note = {Author version unspecified}
}

CITATION.cff

cff-version: 1.2.0
message: "If you use this Skill, cite its author and this versioned security audit report."
title: "browser-fingerprint-audit security audit report (audit version 1)"
version: "unspecified"
type: report
authors:
  - name: "liarjsdev"
date-released: "2026-08-08"
url: "https://skillstore.io/skills/liarjsdev-browser-fingerprint-audit/audits/1"
identifiers:
  - type: other
    value: "skillstore:liarjsdev-browser-fingerprint-audit:audit:1"
    description: "Skillstore immutable audit report identifier"

Skillstore Score

Why this score Evidence Confidence: Medium

Architecture

Maintainability

Content

Community

Spec Compliance

What You Can Build

Review an automation profile

Identify contradictory browser signals before using a controlled automation environment.

Investigate fingerprint drift

Examine canvas, graphics, font, timezone, and network mismatches after an environment change.

Assess privacy exposure

Run offline checks to understand which local browser characteristics are observable.

Try These Prompts

Run a standard audit

Run the default browser fingerprint audit. Report the score, classification, failed check identifiers, and concise explanations.

Run an offline audit

Run the browser fingerprint audit in offline mode. Explain every failed local check and clearly list the skipped network checks.

Inspect selected signal groups

Audit this browser and focus on canvas, WebGL, WebGPU, fonts, WebRTC, and timezone. Explain contradictions and likely environmental causes.

Audit an existing browser session

Audit my running Chrome through the CDP endpoint I provide. Confirm the endpoint and session access risk before attaching.

Best Practices

Use offline mode when external network comparison is unnecessary.
Prefer a temporary browser profile unless the existing session is the explicit audit subject.
Compare unusual environments with a saved baseline instead of relying only on an absolute score.

Avoid

Do not attach to an existing browser without explicit approval and endpoint confirmation.
Do not treat a high consistency score as proof that every website will trust the browser.
Do not send production browsing sessions or sensitive pages to untrusted endpoints.

Frequently Asked Questions

What does the score measure?

It measures consistency among browser signals and the network view. It does not predict every website's detection decision.

Does the standard audit make a network request?

Yes. The online mode contacts liarjs.dev for IP, ASN, HTTP, TLS, header, and ClientHello observations.

Can the audit run without sending data externally?

Yes. Offline mode runs 32 browser-only checks and skips eight network comparison checks.

Does the default scan use my browser profile?

No. It launches a fresh temporary profile and removes that profile after the scan.

Can it scan an already running browser?

Yes, through an approved CDP endpoint. That access can open tabs and read page state in the existing session.

Why can a legitimate environment receive a low score?

Headless mode, datacenter networks, unusual fonts, locale settings, and browser version changes can create real consistency failures.

Developer Details

Author

liarjsdev

License

MIT

Skillstore revision

Version notice

The author did not declare a version.

Repository

https://github.com/liarjsdev/liarjs-skills/tree/4068c79209753c74f895a4a5a6d117fcde8d94d1/skills/browser-fingerprint-audit

Ref

17e49992c9f55842f934ecec5719e4745ba7b95a

Maintenance freshness

8/9/2026

Usage

0 downloads · 0 views

File structure

📁 references/

📄 checks.md

📄 SKILL.md