Content Safety Lock v1.1.0 - Initial Feature-Complete Release

Content Safety Lock v1.1.0

Release Date: 2025-10-24

Initial Feature-Complete Release

Added

Core Features

• Voluntary label detection for adult content (RTA, ICRA/SafeSurf, meta tags)
• Parental/Admin mode with:
  • Enable/disable filtering
  • Category toggles (Sexual/Nudity, Violence, Profanity, Drugs/Alcohol, Gambling)
  • Allow-list and block-list management
  • Settings PIN protection
• Self-Lock mode for adults with:
  • Flexible durations (1h, 4h, 24h, 1w, custom)
  • Multiple blocking scopes (sexual only, sexual+violence, all)
  • Passphrase protection
  • Cool-down delays (30m, 1h, 4h, custom)
  • Phrase verification for unlock
  • Monotonic time tracking for clock tamper detection
  • Private window support

User Interface

• Settings page with 3 tabs (General, Self-Lock, Security)
• Quick status popup
• Block overlay with clear messaging
• Recovery codes generation and management
• Real-time lock status display

Security Features

• SHA-256 passphrase hashing
• Separate passphrases for admin and self-lock modes
• Clock rollback detection and mitigation
• One-time recovery codes
• Phrase verification for early unlock
• Cool-down delays to prevent impulsive disabling

Documentation

• Comprehensive README.md
• Quick Start guide (QUICKSTART.md)
• Testing guide (TESTING.md)
• Deployment guide (DEPLOYMENT.md)
• Changelog

Testing

• Test pages for label detection
• 20 comprehensive test cases
• Edge case coverage
• Performance testing guidelines

Technical Details

• Architecture: Manifest V3 (MV3)
• Storage: browser.storage.local (profile-scoped)
• Content Detection: document_start content scripts
• State Management: Background service worker
• Crypto: Web Crypto API (SHA-256)
• Time Tracking: Monotonic time (performance.now()) + wall clock

Browser Support

• Firefox 109+ (MV3 support)
• Desktop and mobile Firefox
• Private browsing windows

Known Limitations

• Cannot prevent uninstall by admin users
• Cannot prevent OS-level clock changes (only detects them)
• Cannot survive browser profile deletion
• Settings PIN enforced on save, not on every change (design choice)
• Recovery codes stored in browser storage (not encrypted separately)

Installation

Download content_safety_lock-1.1.0.zip and install in Firefox.

First Time Setup

1. Install the extension
2. Click the extension icon to open settings
3. Configure your preferred filtering mode (Parental or Self-Lock)
4. Set up a PIN or passphrase for security
5. Test with the included test pages