Privacy Policy — OpenBook

Last updated: August 31, 2026

OpenBook is a browser new tab extension that helps you visualize and organize your local browser bookmarks. This extension runs on your device only. We do not operate servers, user accounts, analytics, or tracking.

1. Data the extension accesses

Browser bookmarks (read-only)

When you open a new tab or use Sync, OpenBook reads bookmark titles and URLs from your browser to display and categorize them inside the extension. OpenBook does not create, edit, or delete entries in your browser's native bookmark library. Bookmark data is not uploaded to us or any third party.

Local storage (chrome.storage.local)

The following data is stored on your device only:

Auto-classification assignments
Custom groups and card layout
Pinned bookmarks and sort order
Privacy group settings (PIN is stored as a hash, not plain text)
User preferences such as card colors

Favicons

The extension uses the browser's built-in favicon API to show site icons next to bookmarks. Bookmark URLs are not sent to third parties for this purpose in the extension environment.

2. Network requests

OpenBook makes one optional external request:

Hitokoto API (https://v1.hitokoto.cn/) — fetches a random quote (JSON text) shown in the header. No bookmarks, personal information, browsing history, or identifiers are sent with this request.

If the request fails, the extension continues to work normally. OpenBook does not load or execute remote JavaScript or other remote code.

3. Data we do not collect

Personal identity information
Browsing history beyond your saved bookmarks
Analytics or usage telemetry
Payment or account data

4. Data deletion

You can remove all extension data at any time by:

Using Clear layout in the extension, or
Uninstalling the extension, or
Clearing extension data in your browser settings

Removing extension data does not change your browser's native bookmarks.

5. Children's privacy

OpenBook is not directed at children under 13 and does not knowingly collect personal information.

6. Changes to this policy

We may update this policy when the extension changes. The "Last updated" date above will be revised accordingly.

7. Contact

For privacy questions about OpenBook, contact the developer through the extension listing page on the Microsoft Edge Add-ons store or Chrome Web Store.