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Can Extensions Read Your Data? How BDU Protects Your Privacy

By Team BDU
May 25, 2026
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Can Extensions Read Your Data? How BDU Protects Your Privacy

When installing a new extension, it's normal to feel a bit hesitant when the browser warns you: "This extension can read and change your bookmarks". Bookmarks can contain sensitive information, private work links, or administrative dashboards you'd never want to share.

At Bookmark Domain Updater (BDU), we take privacy extremely seriously. In this article, we explain exactly how we handle your data and the protections we've implemented to give you total control.

100% Local Processing (Zero-Knowledge)#

The golden rule of BDU is simple: your bookmarks never leave your computer.

Unlike other extensions that sync data to their servers to analyze or sell it, BDU was built with a Zero-Knowledge architecture regarding your personal data. When you decide to update thousands of bookmarks simultaneously, the entire search and replace process happens directly within your browser's memory. There is no remote database receiving the list of sites you visit.

The "Lock" Feature: Selective Protection#

We know there are bookmarks that must never be accidentally modified, even when using powerful Regex rules for mass edits.

That's why we introduced the Lock feature! 🔒

Within the BDU interface, you can select individual folders or specific bookmarks and apply a protective lock. When an item is locked:

  • It is ignored by all search and replace operations.
  • It cannot be altered accidentally by generic rules.
  • It remains visible but protected until you manually decide to unlock it.

This feature is ideal for protecting vital work folders or links to banking and e-commerce portals that will never change domains.

Security and Prevention#

In addition to the lock, we always recommend adopting good prevention practices. Before initiating a massive replacement involving hundreds of links, our tool encourages you to create a safety save.

If you're unsure how to do this, we invite you to read our guide on how to perform a backup via extension and why it's crucial. An isolated backup is your ultimate safety net.

Our Promise#

Our business model is based on offering a superior productivity tool, not on monetizing user data. We will continue to add features (like the Lock and the anti-crack architecture) designed solely to protect and speed up your workflow.

If you have questions about security or want to suggest new protection features, feel free to contact us. Your security is our priority.

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