Task 007: Browser Extension Security Architecture

[AustinZ21]

Description

Implement secure Manifest V3 browser extension with progressive permissions, dynamic platform registry, and end-to-end encrypted communication. The extension serves as the primary interface for privacy data collection from social media platforms.

Acceptance Criteria

• Manifest V3 extension with proper CSP policies and security headers
• Progressive permission system requesting minimal initial permissions
• Dynamic platform registry that can be updated without extension updates
• End-to-end encrypted communication channel between extension and backend API

Technical Details

Manifest V3 Structure

• Service worker-based background script for persistent monitoring
• Content scripts for platform-specific data extraction
• Popup interface for user controls and status display
• Options page for configuration and settings

Security Implementation

• Content Security Policy (CSP) with strict directives
• Secure message passing between content scripts and background
• Platform URL pattern matching with dynamic updates
• Encrypted storage for sensitive configuration data

Permission Management

• Initial minimal permissions (activeTab, storage)
• Dynamic permission requests for specific platforms
• User consent flow for additional permissions
• Permission revocation and cleanup mechanisms

Platform Registry

• Remote configuration for supported platforms
• Version control for platform definitions
• Fallback to local registry if remote unavailable
• Automatic updates with user notification

Dependencies

• Task 001: Project structure and configuration
• Task 004: Platform registry and scraping engine architecture

Effort Estimate

Large (3-4 days)

• Day 1: Manifest V3 setup and security configuration
• Day 2: Permission management system
• Day 3: Encrypted communication layer
• Day 4: Platform registry integration

Definition of Done

• Extension successfully installs with minimal permissions
• Dynamic permission requests work for all supported platforms
• Encrypted communication established with backend
• Platform registry updates without requiring extension reload
• All security tests pass including CSP validation
• Extension passes Chrome Web Store review guidelines

---

📋 Local file: .claude/epics/privyloop/007.md