Privacy Shield — Arthur

Browser extension that shows you what websites know about you. Detects fingerprinting, trackers, and dark patterns. 100% offline and private.

Fingerprint Detection 🔍

Detects 19+ fingerprinting techniques:
- Canvas - Drawing patterns unique to your GPU
- WebGL - GPU renderer and vendor info
- Audio - AudioContext processing differences
- Fonts - List of installed fonts
- Screen - Resolution, color depth, pixel ratio
- Navigator - User agent, language, platform
- Hardware - CPU cores, device memory
- WebRTC - Local IP address leaks
- Timezone - Timezone offset fingerprinting
- Plugins - Installed browser plugins
- Battery - Battery status API
- Client Rects - Element rendering differences
- Speech - Available speech synthesis voices
- Storage Estimate - Available storage detection
- Media Devices - Connected media devices
- Permissions - Granted permissions fingerprinting
- CSS Media - Media query fingerprinting
- Gamepad - Connected gamepads

Tracker Detection 📊

Identifies known trackers:
- Google Analytics, Facebook Pixel, TikTok, etc.
- Ad networks (Criteo, Taboola, DoubleClick)
- Analytics services (Hotjar, Mixpanel, Segment)
- Session replay tools
- Social media widgets
- Tracking cookies & URL parameters
- Bounce trackers & beacon trackers

API Monitoring

Alerts when pages access:
- Geolocation
- Camera / Microphone
- Clipboard (read/write)
- Notifications
- Local storage usage

Dark Patterns (16 categories)

Detects manipulative UI patterns:
- Confirmshaming - Guilt-trip decline buttons
- Visual Misdirection - Hidden/tiny reject buttons
- Fake Urgency - Countdown timers, "only X left"
- Pre-selection - Pre-checked marketing consent
- Hidden Cost - Surprise fees at checkout
- Cookie Banner Manipulation - Deceptive cookie dialogs
- Obstruction - Hard to cancel/unsubscribe
- Sneaking - Adding items to cart without consent
- Trick Questions - Confusing double-negatives
- Disguised Ads - Ads that look like content
- Forced Continuity - Hard to cancel subscriptions
- Nagging - Repeated popups and interruptions
- Privacy Zuckering - Confusing privacy settings
- Social Proof - Fake reviews/activity notifications
- Roach Motel - Easy to sign up, hard to leave
- Notification Spam - Excessive push notification requests

Privacy Score
Each page gets a privacy score (0-100) and grade (A-F) based on:
- Fingerprinting techniques detected
- Number of trackers
- Tracking cookies
- Sensitive API access
- Dark patterns found

Settings
- Toggle individual detection modules
- Sensitivity levels (low/medium/high)
- Auto-scan on page load
- Show badge count on icon
- Notify on high-risk sites
- Highlight detected elements on page
- Whitelist trusted domains

Statistics
- Total scans performed
- Average privacy score
- Total trackers/patterns detected
- Worst and best sites list

Privacy

100% Offline & Private:
- All detection happens in your browser
- No data sent to external servers
- No tracking, no analytics
- No account required
- Settings stored locally only
- Open source