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Browser Extensions Penetration Testing

Browser Extensions Penetration TestingChrome, Firefox & Edge Extensions

Secure your browser extensions against vulnerabilities that could compromise millions of users' data and privacy.

Extension Security Assessment

Our browser extension testing identifies vulnerabilities that could lead to data theft, account takeover, or malicious script injection.

Manifest security review
Content script injection testing
Cross-origin data leakage prevention
Real-time findings via Slack/Teams
Web store compliance validation
Privacy policy verification

Extension Testing Coverage

Extension Security

Core extension security assessment

  • Manifest security review
  • Permissions audit and escalation
  • Content script injection testing
  • Cross-origin data leakage prevention
  • Message passing validation
  • DOM manipulation security

Data & Privacy

Data handling and privacy compliance

  • Local storage security
  • Cookie access validation
  • Password manager integration
  • Third-party library scanning
  • Analytics code review
  • Privacy policy verification

Runtime Security

Dynamic behavior and network security

  • Background script vulnerabilities
  • Service worker security
  • Request interception testing
  • WebRequest API security
  • Web store compliance validation
  • Extension update security

Extension Testing Methodology

Systematic approach to extension security

Static Analysis

Source code and manifest review

Key Activities

  • Manifest.json security audit
  • JavaScript code review
  • HTML/CSS injection points
  • Resource file analysis
  • Build process review

Dynamic Testing

Runtime security assessment

Key Activities

  • Extension behavior monitoring
  • Network traffic analysis
  • Storage manipulation testing
  • Message passing exploitation
  • Permission abuse testing

Integration Testing

Website interaction security

Key Activities

  • Content script injection
  • Cross-site data access
  • Cookie theft attempts
  • Form hijacking testing
  • Clickjacking prevention

Privacy Assessment

User privacy protection

Key Activities

  • Data collection analysis
  • Tracking implementation review
  • Third-party data sharing
  • GDPR compliance check
  • Privacy policy validation

Extension Security Benefits

User Trust

Build confidence with secure extensions

Data Protection

Prevent user data breaches

Store Compliance

Meet Chrome/Firefox store requirements

Brand Safety

Protect against reputational damage

Extension Security Deliverables

Comprehensive Security Reports

Executive and detailed technical reports with findings and evidence

Extension Hardening Guide

Security best practices for browser extension development

Privacy Impact Assessment

Data handling and privacy compliance evaluation