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VulnLens AI is a lightweight Firefox extension that passively scans web pages for security flaws. It inspects HTTP headers and the DOM for weak or missing configurations, using a three-tier AI engine (Cloud, local Ollama, or offline rules) to explain vulnerabilities and deliver clear, actionable remediation fixes in plain language.

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Authors: Yash M. Panchal & Umang K. Nagwadiya

A Firefox WebExtension that passively scans the currently open web page for common security misconfigurations, then uses a completely free, offline AI analysis engine to explain the risk and suggest defensive remediation — packaged as a lightweight VAPT (Vulnerability Assessment & Penetration Testing) assistant.

⚠️Authorized use only. Only scan sites you own or have explicit written permission to test. This tool performs passive/read-only checks (headers, DOM inspection, source patterns) — it does not send exploit payloads, brute-force credentials, or perform active attacks.

Why this build is 100% free

Unlike typical "AI-powered" tools that require a paid API key or third-party servers, VulnLens AI runs entirely in your browser:

  • 100% Serverless: No Python server scripts, database configs, or external hosts to set up.
  • Offline Rule Engine: Falls back to an on-device JavaScript classification engine (local_engine.js) if no local LLM is running.
  • Direct Local LLM Connection: Connects directly to Ollama running on your local machine (http://localhost:11434) without server-side middleware.
  • Private Scan History: Scan history is stored directly in Firefox's sandbox storage (browser.storage.local).

What it detects

  • Missing security headers (CSP, HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy)
  • Mixed content (HTTP resources on HTTPS pages)
  • Forms submitting over HTTP / missing CSRF-token-like hidden fields
  • Inline scripts / inline event handlers (CSP weaknesses)
  • Known-vulnerable/outdated frontend library version signatures
  • Secrets/keys accidentally left in page source or HTML comments (AWS Keys, Private Keys, API Keys)
  • target="_blank" links missing rel="noopener"
  • Server/technology fingerprinting headers (Server, X-Powered-By)
  • JS-readable (non-HttpOnly) cookies

Project structure

VulnLens-AI-Firefox/ ├── manifest.json # Firefox WebExtension manifest (MV3 on Gecko) ├── popup.html/css/js # Extension popup UI + logic (browser.* API) ├── content.js # Passive DOM/source scanner (runs on page) ├── background.js # Background script: header inspection + LLM orchestration ├── local_engine.js # Offline rule-based analysis engine (JS fallback) ├── report.js # Builds a downloadable HTML VAPT report ├── icons/ └── assets/ 

Setup & Usage

1. (Optional) Run a Local LLM

If you want to use advanced LLM summaries locally and offline:

  1. Download and run Ollama from ollama.com.
  2. Pull your model of choice (e.g. llama3 or gemma2:2b):
    ollama pull llama3

2. Load the Extension in Firefox

  1. Open Firefox and type about:debugging#/runtime/this-firefox in the address bar.
  2. Click Load Temporary Add-on….
  3. Select the manifest.json file inside the VulnLens-AI-Firefox/ folder.

3. Scan a Web Page

  1. Navigate to a page you are authorized to test.
  2. Click the VulnLens AI extension icon in your toolbar.
  3. Click Scan This Page to run the passive DOM/header checks.
  4. Click API Settings at the bottom to configure your Ollama port and model name.
  5. Click AI Analysis (Free) to generate summaries. If Ollama is running, it queries the model directly. If not, it falls back to the internal rule-based engine.
  6. Click Generate Report to download a self-contained HTML report.

Authors

Yash M. Panchal & Umang K. Nagwadiya

About

VulnLens AI is a lightweight Firefox extension that passively scans web pages for security flaws. It inspects HTTP headers and the DOM for weak or missing configurations, using a three-tier AI engine (Cloud, local Ollama, or offline rules) to explain vulnerabilities and deliver clear, actionable remediation fixes in plain language.

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