Privacy Policy

Your Data, Your Control

We believe in transparency. Here's exactly what data YouTube Danmaku accesses and why.

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No Account Required
The extension works completely offline without any login or registration
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Local Processing
All comment data is processed locally in your browser, never on our servers
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No Data Collection
We don't collect, store, or share any personally identifiable information

Data Collection

What the extension accesses

YouTube Danmaku reads content from YouTube pages to display comments as danmaku overlay.

Page Content Access

The extension requires access to YouTube pages to:

  • Extract comment text from the page DOM
  • Read comment author names for display
  • Access comment timestamps for synchronization
  • Load hidden iframe comments when available

All extraction happens locally. No comment data is sent to external servers.

Translation Data

When you use the translation feature, comment text is sent to Google Translate API. We don't control this service — it's between you and Google's privacy policy.

Permissions

Browser permissions explained

Each permission is necessary for the extension to function.

activeTab Access current tab when you click the extension icon. Required to read YouTube page content for danmaku.
storage Store your preferences (danmaku speed, opacity, font size) and playback position. All data stays on your device.
unlimitedStorage Allow larger storage capacity for saving more playback positions across many videos.

Note: We don't use the "webRequest" or "cookies" permissions. We don't track your browsing activity, don't monitor which videos you watch, and don't share any data with third parties.

Third-party Services

External APIs used

Google Translate API

The one-click translation feature uses Google Translate. When you translate a comment, the text is sent to Google's servers. This service is governed by Google's own privacy policy.

Browser Extension Stores

When you install from Chrome Web Store or Firefox Add-ons, your download is processed by Google's or Mozilla's infrastructure. Review their respective privacy policies for that process.

Your Rights

You have full control

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No Account Needed
Since there's no login system, there's no account data to delete. Simply uninstall the extension.
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Clear Local Data
All settings and preferences are stored in browser storage. Go to extension settings to clear them anytime.
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No Data Selling
We don't sell, rent, or share any data. The extension has no analytics, no tracking pixels, no external servers.

Questions?

If you have any questions about our privacy practices, contact us via email.