Privacy Policy - FontDetector Pro Browser Extension

Last Updated: October 2025
Extension Version: 1.0.0
Contact: djeknitiweb@gmail.com
Supported Browsers: Chrome, Edge, Firefox (Manifest V3)

Overview

FontDetector Pro is a cross-browser extension designed to identify, analyze, and work with fonts on web pages. The extension helps web designers, developers, and typography enthusiasts detect fonts, build font collections, and test font applications. This Privacy Policy explains how we collect, use, and protect your information.

Information We Collect

1. Font and Typography Data (Locally Processed)

Font information from web pages - Font family, style, weight, size, color
Font collections - User-saved fonts and collections stored locally
Font files - Binary data (ArrayBuffer) of downloaded fonts
User preferences - Extension settings and configuration

Important: Font data is processed locally in your browser. Font collection data is only sent to our servers when you add fonts to collections (for analytics purposes only).

2. Google Fonts Integration Data

When you use Google Fonts features:

Requests to Google Fonts API for font catalog and downloads
Font preview data and metadata
Google Fonts privacy policy applies: Google Fonts FAQ

3. License Information (Premium Features)

When you use premium features, we process:

License keys - User-provided keys for premium feature activation
License validation data - Verification of premium access (license key only)
Activation status - Whether premium features are unlocked

Payment Processing: All payment processing happens entirely on Stripe's platform. The extension never accesses, processes, or stores any payment information.

4. Font Analytics Data

Top Fonts tracking - Aggregated data on most popular fonts added to collections
Font usage notifications - Server notifications when fonts are added to collections (font metadata only)
Font file size - Size in KB for bandwidth optimization

5. Technical Data

Extension usage statistics (locally stored)
Error logs for debugging (no personal data)
Browser session data for functionality
License validation requests for premium feature access verification

6. License Validation Service

Service Provider: Backend API license validation service
Purpose: Verify premium feature access and prevent license abuse

Data Transmitted to API Server:
- Device identifier (generated unique ID based on crypto.randomUUID())
- Extension version number
- Timestamp of validation request
Validation Endpoints:
- /api/check-subscription (subscription status validation)
Frequency:
- Manual check when user clicks "Check subscription" button
- Cached validation results for 24 hours
- On-demand validation for premium feature access
Security Metadata Stored Locally:
- Last validation timestamp (encrypted)
- Device ID for subscription binding
- Subscription expiry date (encoded with salt)
No Personal Data: No names, emails, payment info, font data, or browsing history sent
Minimal Server Logging: Only technical logs for fraud prevention and debugging
Data Retention: Server logs automatically deleted after 30 days maximum
Security: All transmissions use HTTPS encryption with secure headers

How We Use Your Information

Core Functionality

Font Detection: Identify fonts used on web pages using Canvas API
Font Collections: Store and organize user-saved fonts locally
Font Application: Apply fonts to page elements for testing purposes
Color Analysis: Extract color palettes from web pages
Font Download: Save font files for offline use

Premium Features and Licensing

Subscription Validation: Verify premium feature access through Stripe subscriptions
Feature Unlocking: Enable unlimited collections, font testing, and downloads
Subscription Management: Store activation status locally

Third-Party Integrations

Google Fonts API: Access font catalog and download Google Fonts
Top Fonts Analytics: Aggregate popular fonts data from user collections
Local Processing: Font detection and analysis happens locally in browser

Premium Features and Billing

Payment Model

External Payment Processing: Subscriptions processed through Stripe Checkout
No In-Extension Payments: Extension doesn't process or handle payments
Monthly Subscription: Premium features for $2.99/month
Subscription Management: Manage through Stripe Customer Portal

Subscription Management

Device ID System: Unique ID generated for each browser installation
Local Storage: Subscription status stored locally in encrypted format
Validation: On-demand verification with API server (Device ID only)
24-Hour Cache: Subscription checks cached for better performance

Refund Policy: Refunds are not provided, as once premium features are activated, they cannot be cancelled.

Data Storage and Security

Local Storage Methods

Browser Storage API: Extension settings and preferences (Chrome, Edge, Firefox compatible)
IndexedDB Database: Font collections, font files (ArrayBuffer), Top Fonts cache, Google Fonts catalog
Local Caching: Top Fonts data (24 hours), Google Fonts data
chrome.storage.sync: Device ID and subscription status (synced across devices)
Subscription Information: Premium activation status (encrypted locally)

IndexedDB Storage Details

Enhanced Local Storage: The extension uses IndexedDB for robust local data management

Font Collections Database:
- User-created font collections with custom names and colors
- Collection metadata (creation dates, modification times)
- Font-to-collection associations
- All data stored locally in your browser's IndexedDB
Font Files Database:
- Binary font data stored as ArrayBuffer
- Font metadata (family, style, weight, format)
- Base64 encoded font data for quick access
- Font file size information
Top Fonts Cache:
- Cached list of top 10 popular fonts
- Font preview data and metadata
- Cache timestamp for 24-hour refresh cycle
- Font usage statistics
Google Fonts Cache:
- Google Fonts catalog data
- Font family information and categories
- Font preview URLs and metadata
- Search and filter optimization data
Data Persistence:
- All IndexedDB data persists across browser sessions
- Data survives extension updates and browser restarts
- Manual export/import of font collections
- Automatic cache cleanup after 24 hours
Privacy Protection:
- All IndexedDB data stored locally on your device
- No automatic synchronization to external servers
- Data only accessible by the extension itself
- Complete user control over data deletion

Security Measures

Shadow DOM Isolation: Modal UI isolated from page content to prevent style conflicts
Content Script Isolation: Extension runs in isolated browser context across all supported browsers
HTTPS Encryption: All external API calls use secure connections
Subscription Encryption: Premium activation data is encrypted locally with salt-based encoding
IndexedDB Security: Database access restricted to extension origin only
Cross-Browser Compatibility: Security measures consistent across Chrome, Edge, and Firefox
No Payment Data: Extension never accesses or stores payment information
Local Data Protection: All IndexedDB data encrypted and isolated per browser profile
Canvas API Security: Font detection uses Canvas API without storing rendered content

Permissions Explained

Host Permissions

"<all_urls>" - Access any website to detect fonts and colors
"https://fonts.googleapis.com/*" - Google Fonts API integration
"https://fonts.gstatic.com/*" - Google Fonts file downloads

Browser Permissions

"storage" - Save font collections and subscription information locally
"tabs" - Access tab information for font detection
"activeTab" - Interact with current page for font inspection
"contextMenus" - Add right-click menu options ("Inspect Page Fonts", "Show Font Collections")
"scripting" - Inject font inspector and modal UI into web pages

Third-Party Services

Payment Processing (External)

Stripe Checkout: Monthly subscriptions ($4.99/month) processed on Stripe's platform
Stripe Customer Portal: Subscription management handled by Stripe
Payment Isolation: Extension never handles payment data or processes transactions
Data Collection: Payment and billing handled entirely by Stripe
Security: Stripe provides PCI DSS Level 1 compliant payment processing
Privacy Policy: https://stripe.com/privacy

Google Fonts API

Font Catalog: Access to complete Google Fonts library
Font Downloads: Direct downloads from Google Fonts servers
Free Fonts: All Google Fonts are open source and free to use
Privacy Notice: Google Fonts privacy policy applies: Google Fonts FAQ

Subscription Validation Service

Service Provider: Backend API server
Purpose: Verify premium feature access and prevent subscription abuse

Data Processing: Server-side validation prevents local subscription tampering
Data Transmitted:
- Device identifier (generated unique ID)
- Extension version
- Timestamp of validation request
Validation Process:
- On-demand validation when user clicks "Check subscription"
- Results cached for 24 hours
- No automatic background checks
No Personal Data: No font data, user names, emails, or payment information sent
Minimal Server Logging: Technical logs only for fraud prevention and debugging
Data Retention: Automatic log deletion after 30 days maximum

Top Fonts Analytics

Font Popularity Tracking: Aggregated statistics on fonts added to collections
Server Notifications: Background requests when fonts are added to collections
Data Transmitted: Font metadata (family, style, weight), file size, Base64 encoded font data (chunked)
Purpose: Generate "Top 10 Fonts" ranking for community
No Personal Data: No user identification or browsing history collected

Your Rights and Choices

Data Control

Font Inspector: Enable/disable font inspection mode at any time
Local Storage: All your font collections stay in your browser's local storage and IndexedDB
Collection Management: Create, edit, delete font collections at will
Clear Data: Uninstall extension to remove all local data and IndexedDB entries
Subscription Management: View and manage your premium subscription status
IndexedDB Management:
- View all stored font collections and fonts through extension interface
- Export font collections to JSON format for backup or migration
- Delete individual fonts or entire collections
- Clear cache data (Top Fonts, Google Fonts) manually
- Browser developer tools access for advanced data inspection
Cross-Browser Data: Data stored independently in each browser installation
Synced Settings: Device ID and subscription status sync via chrome.storage.sync

Subscription and Payment Rights

Subscription Portability: Subscription status syncs across devices with same Device ID
Payment Data: Managed entirely by Stripe (refer to their privacy policy)
Support Access: Contact support for subscription-related issues
Cancellation: Cancel subscription anytime through Stripe Customer Portal
Refund Requests: Handle refunds through Stripe payment platform

Data Portability

Export Features: Export your font collections anytime
Standard Formats: Font collections exported in JSON format, fonts as binary files
No Lock-in: Font collections remain accessible even without premium subscription
Subscription Sync: Subscription status syncs across devices via chrome.storage.sync
Cross-Browser Migration:
- Export collections from Chrome and import to Edge (or vice versa)
- Complete font collection portability
- Font files (ArrayBuffer) transferable between browsers
- Backup and restore functionality for collection protection
IndexedDB Export:
- Complete database dump available through extension interface
- Export collections with font metadata and binary data
- Selective export by collection
- Import validation ensures data integrity during migration

Regional Compliance

RegulationCompliance Measures
GDPR (EU) | Data minimization, user consent, right to erasure, data portability. Payment data handled by Stripe under their GDPR compliance.
CCPA (California) | No sale of personal information, transparency, access and deletion rights
Payment Security | PCI DSS Level 1 compliance handled by Stripe. Extension never accesses payment information.

Children's Privacy

This extension is not intended for users under 13 years old. We don't knowingly collect information from children under 13.

Payment Restrictions: Premium subscription requires payment through Stripe. Age verification handled by payment processor.

Contact Information

For privacy-related questions or concerns:

General Support: djeknitiweb@gmail.com
Subscription Issues: djeknitiweb@gmail.com
Browser Extension Stores:
- Chrome Web Store: Leave reviews for public feedback
- Microsoft Edge Add-ons: Reviews and support feedback
- Firefox Add-ons: Community support and reviews

For payment and billing inquiries:

Payment Support: Contact Stripe directly through their payment platform
Refund Requests: Process through Stripe Customer Portal or payment platform
Subscription Support: djeknitiweb@gmail.com for technical subscription issues

Changes to Privacy Policy

We may update this Privacy Policy to reflect feature updates, legal requirements, user feedback, or subscription system changes. Updates will be communicated through extension notifications and Chrome Web Store listing updates.

FontDetector Pro Browser Extension - Privacy Policy v1.0.0

By using FontDetector Pro, you acknowledge that you have read and understood this Privacy Policy and agree to the collection and use of information in accordance with this policy.

Cross-Browser Compatibility: This privacy policy applies to all supported browsers including Chrome, Microsoft Edge, and Firefox.

Payment Processing: All payment processing handled externally by Stripe. Extension only processes subscription status for feature validation.

IndexedDB Storage: All local data stored in browser's IndexedDB (font collections, font files, cache) remains under your complete control and is never transmitted externally without explicit user action.

Font Analytics: When you add fonts to collections, metadata is sent to our servers for Top Fonts analytics. No personal data or browsing history is collected.