# Library Sniffer

> Sniff website frameworks, libraries, servers, and optional remote technology API results.

Canonical page: [https://chrome-stats.com/d/library-sniffer](https://chrome-stats.com/d/library-sniffer)

## Overview

- **ID:** `library-sniffer`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** xiaofeng
- **Category:** web-development
- **Daily users:** 6
- **Weekly downloads:** 1
- **Version:** 2.9.1
- **Last updated:** 2026-07-03
- **First published:** 2026-06-30
- **Size:** 536 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/library-sniffer/)
- **Website:** [https://www.xinai.de/](https://www.xinai.de/)

## Description

Manifest V3 service worker architecture.
Local detection for common CMS, JavaScript libraries, web frameworks, analytics tools, APIs, and web servers.
Normalized remote technology categories for JavaScript frameworks, CDN, security, payment processors, font scripts, JavaScript libraries, web frameworks, UI frameworks, and programming languages.
Optional free API lookup providers:
TechnologyChecker Free plan: GET <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/36e3822efd9cdfeea27a8da63d8e51e7d700f376d1f75d9e9bc27d4138073852/https%3A//api.technologychecker.io/v1/domain/DOMAIN" rel="nofollow">https://api.technologychecker.io/v1/domain/DOMAIN</a>
BuiltWith Free API: GET <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/483e2ccf2fb169731b6e09088a8263e6dac64c7cc7f1238f87ac7358ac97a9a7/https%3A//api.builtwith.com/free1/api.json%3FKEY=API_KEY&amp;LOOKUP=DOMAIN" rel="nofollow">https://api.builtwith.com/free1/api.json?KEY=API_KEY&amp;LOOKUP=DOMAIN</a>
Refreshed options page and new release icons.

## Rankings

- #41,944 — Overall
- #34 — library
- #232 — payments

## Permissions and access

### Permissions

- `tabs`
- `webRequest`
- `storage`

### Host permissions

- `http://*/*`
- `https://*/*`
- `https://api.builtwith.com/*`
- `https://api.technologychecker.io/*`

### Content script matches

- `*`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/library-sniffer)