Privacy Policy for "Just Danmaku"

Last Updated: July 3, 2026

Thank you for using "Just Danmaku" (the "Extension"). We are committed to protecting your privacy and ensuring that your data is handled securely and transparently. This Privacy Policy explains what information we collect, how it is used, and how it is protected.

1. Information We Do NOT Collect

Our core philosophy is absolute privacy and anonymity. Therefore, we explicitly DO NOT collect, store, or transmit any of the following:

• No Chat Logs: All chat messages (danmaku) are relayed in real-time and immediately discarded. We do not maintain any databases, backups, or logs of user conversations.
• No Browsing History: We do not track your browsing habits, history, or the websites you visit when the extension is turned off.
• No Personal Identifiable Information (PII): We do not collect names, email addresses, IP addresses, or any other personal data. No user registration is required.

2. Permissions and How We Use Them

To function properly, the Extension requires certain permissions from your browser. Here is exactly why we need them and how they are used:

• Website Access (<all_urls>): This permission is required to overlay the chat interface on any webpage you choose to activate it on. The Extension reads your current URL locally on your device to use it as the "Chatroom ID," ensuring you are grouped with other visitors on the exact same page. This URL is briefly sent to our WebSocket server to establish the connection but is never stored or logged.
• storage: We use local storage (on your device only) to save your UI preferences, such as the position, size, and background color of the chat window. This data never leaves your device.
• tabs & scripting: Used strictly to inject the chat interface into your active tab when you click the extension icon, and to maintain the interface if the webpage performs a dynamic internal reload (Single-Page Application routing).

3. Third-Party Services

Our real-time chat relay is powered by Cloudflare Workers and Durable Objects. The WebSocket connection between your browser and Cloudflare is encrypted (WSS). Messages are processed entirely in-memory and are not written to any persistent storage.

4. User Responsibility

Because all messages are strictly ephemeral and anonymous, users are solely responsible for their own actions and the content they transmit. Please abide by standard internet etiquette. Do not use this tool for illegal activities, harassment, or transmitting illegal content.

5. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Any changes will be reflected on this page with an updated "Last Updated" date.

6. Contact Us

If you have any questions or concerns about this Privacy Policy, please feel free to reach out via the support section on the Chrome Web Store page.