Privacy Policy

Last updated: February 11, 2026

What Closure Does

Closure is a browser extension that organizes your tabs — grouping them by domain, detecting broken pages, and archiving idle tabs with optional AI-generated summaries. That's it.

Data Collection

Closure collects nothing. Specifically:

• No personal information is collected.
• No browsing history is collected.
• No analytics or telemetry of any kind.
• No cookies, fingerprinting, or tracking.
• No user accounts or sign-ins.

Data Storage

Closure stores data locally on your device using Chrome's built-in chrome.storage.local API. This data never leaves your machine. It includes:

• Settings — your configuration preferences (group threshold, idle timeout, whitelist, etc.).
• Archived tabs — the URL, title, favicon, and an AI-generated or fallback summary of tabs that were archived.
• Swept tab log — a record of broken/error tabs that were closed, for your reference.
• Statistics — a simple count of tabs tidied and estimated RAM saved.

You can view and delete all stored data from the Settings page at any time.

Network Requests

Closure makes zero network requests. No data is sent to any server, API, or third party. The extension does not contain any code that communicates over the network. This is verified by automated tests that monitor all network activity from every extension page.

AI Processing

When enabled, AI-powered features (tab summaries, topic grouping) use Chrome's built-in on-device Gemini Nano model. All processing happens locally on your hardware. No text, URLs, or page content is sent anywhere.

Permissions

Closure requests the following browser permissions, each for a specific purpose:

• tabs — to read tab URLs and titles for grouping, sweeping, and archival.
• tabGroups — to create, name, and color tab groups.
• storage — to save your settings and archived tab data locally.
• alarms — to schedule periodic checks (sweeping, idle detection).
• notifications — to alert you before a tab is archived ("Stay of Execution").
• offscreen — to run the on-device AI model in a background document.
• scripting (optional) — to read page content for more accurate AI summaries. Only requested when you enable "Rich Page Analysis."

Third Parties

There are no third parties. No SDKs, no libraries that phone home, no embedded content, no remote resources. The extension is entirely self-contained.

Monetization

Closure is free. There are no ads, no paid tiers, no in-app purchases. The extension includes optional donation links to Ko-fi — these are clearly labeled and never block functionality.

Children's Privacy

Closure does not collect data from anyone, including children.

Changes to This Policy

If this policy changes, the updated version will be published here. Since there's no data to collect, it's unlikely to change much.

Contact

Questions? Open an issue at github.com/krich11/closure.