Tab URL Blocker 404

About

URL Blocker gives you precise control over which websites can be accessed in your browser.

Define URL patterns, block unwanted destinations at the network level, and optionally capture block events for audit or debugging purposes. The extension is built on Chrome’s Manifest V3 declarative rules engine to ensure performance, security, and compliance.

Key Features

Pattern-based URL blocking using Chrome’s native network rules

Instant enforcement without page interception or content inspection

Optional tab auto-close on blocked requests

Optional reporting of blocked events to a user-configured endpoint

All configuration stored locally on the user’s device

No ads, no tracking, no monetization

How It Works

The extension evaluates outgoing requests against user-defined rules and blocks matching URLs before the request completes. This approach avoids performance overhead and does not access page content or user credentials.

Reporting is disabled by default and can be enabled explicitly by the user. When enabled, only minimal metadata related to blocked requests is sent to a server specified by the user.

Privacy and Data Usage

No browsing history is collected

No personal data is transmitted by default

No third-party analytics or trackers

Reporting is fully optional and user-controlled

Intended Use Cases

Productivity and focus enforcement

Parental or organizational controls

Testing and debugging URL access behavior

Custom policy enforcement for web access