Privacy Policy

Last updated: May 28, 2026 (Cloud Sync section)

Overview

YT Series ("the Extension") lets you manage YouTube playlists as TV series with progress tracking. This policy explains what data the Extension collects, how it is used, and your rights.

Data Collected

Stored Locally (chrome.storage)

All data is stored locally in your browser using Chrome's storage.local and storage.sync APIs:

• Series data: playlist IDs, titles, thumbnails, channel info, video metadata, and your watched/progress state for each episode
• Settings: theme preference, language, new episode notification toggle, last refresh timestamp

By default, the Extension does not collect your name or email. Optional Cloud Sync (see below) uses your Google account only when you sign in.

Cloud Sync (optional, Firebase)

If you choose Sign in with Google in Settings, the Extension syncs series progress and minimal playlist metadata to Google Firebase Firestore (EU region when configured as europe-west). Data is stored under your Firebase user ID and protected by security rules so only you can read or write your documents.

• Synced: playlist IDs, titles, thumbnails, channel names, episode watch progress
• Not synced to Firebase: theme/language settings (Chrome sync), full YouTube video catalogs (refetched from YouTube API on each device)

You can sign out at any time. Resetting all data in Settings also removes your remote series documents and signs you out.

YouTube Data API

When you add a playlist or search YouTube, the Extension sends requests to the YouTube Data API v3 using your API key. These requests fetch public playlist metadata, video lists, and search results. No authentication is used—only public data is accessed.

Data Transmission

The Extension communicates externally only with:

• www.googleapis.com – YouTube Data API requests
• shy-snowflake-0680.lollo-princigalli.workers.dev – YouTube API proxy (transparent relay, no data logged or stored)
• identitytoolkit.googleapis.com, securetoken.googleapis.com, firestore.googleapis.com – Cloud Sync only, when you are signed in

No analytics, no advertising trackers, and no third-party scripts in the Extension UI. The Cloudflare Worker relay does not log or store personal data.

Data Retention & Deletion

All data persists in chrome.storage until you either:

• Delete individual series via the Extension UI
• Use the "Reset All Data" option in Settings
• Uninstall the Extension (Chrome automatically removes all stored data)
• Sign out of Cloud Sync and/or use Reset All Data (also deletes Firestore copies of your series)

Permissions Justification

• storage – needed to save series and settings data locally
• alarms – needed for periodic background checks for new episodes
• notifications – needed to alert you when new episodes are found
• tabs – needed to open the Extension's tab interface
• identity – needed for optional Google sign-in (Cloud Sync)
• youtube.com – needed to inject the sidebar shortcut on YouTube pages
• googleapis.com – needed for YouTube Data API requests
• shy-snowflake-0680.lollo-princigalli.workers.dev – needed to relay YouTube API requests without exposing your API key

Third-Party Services

• YouTube Data API v3 – subject to Google Privacy Policy
• Cloudflare Workers – transparent API relay, subject to Cloudflare Privacy Policy
• Google Firebase – optional Cloud Sync storage and authentication, subject to Firebase Privacy and Google Privacy Policy

Your Rights

Since all data is stored locally on your device, you have full control. You can view, export, or delete your data at any time through the Extension's interface or by clearing Chrome storage.

Changes to This Policy

If this policy changes, the "Last updated" date at the top will be revised. Continued use of the Extension after changes constitutes acceptance of the updated policy.

Contact

For questions about this privacy policy, open an issue at the GitHub repository.