# CORS Unblock

> Web apps cross-origin access with precise domain control and simple permissions.

Canonical page: [https://chrome-stats.com/d/cors-unblock2](https://chrome-stats.com/d/cors-unblock2)

## Overview

- **ID:** `cors-unblock2`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** rxliuli
- **Category:** web-development
- **Daily users:** 89
- **Weekly downloads:** 14
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 0.3.1
- **Last updated:** 2025-04-29
- **First published:** 2025-04-22
- **Size:** 778 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/cors-unblock2/)
- **Website:** [https://github.com/rxliuli/cors-unblock/issues](https://github.com/rxliuli/cors-unblock/issues)

## Description

CORS Unblock is a powerful browser extension that enhances web applications by enabling controlled cross-origin requests. It provides native-like networking capabilities while maintaining security through explicit permission controls.

Key Features:

• Precise Domain Control
- Grant specific websites permission to access external APIs
- Manage permissions on a per-domain basis
- Revoke access anytime through an intuitive interface

• Security-First Design
- No user data collection
- All operations performed locally in your browser
- Explicit permission model for maximum security

• Developer-Friendly
- Simple API integration
- Programmatic permission requests
- Seamless cross-origin requests once authorized

• Lightweight & Efficient
- Minimal impact on browsing performance
- Clean, intuitive user interface
- Quick permission management

For Developers:
CORS Unblock provides a straightforward API to request domain access permissions. Once user authorization is granted, your web application can make cross-origin requests without complex proxy servers or CORS configurations.

For Users:
The extension works automatically in the background. When a web application needs cross-origin access, you'll receive a clear permission request. You maintain full control over which domains can communicate with each other.

Privacy & Security:
We take your privacy seriously. CORS Unblock:
- Collects no user data
- Processes all operations locally
- Requires explicit permission for each domain
- Allows instant permission revocation

This extension is perfect for developers building modern web applications and users who want to safely enable cross-origin capabilities while maintaining control over their browsing security.

## Rankings

- #12,238 — Overall
- #25 — unblock
- #69 — permission
- #70 — permissions
- #140 — course
- #151 — grant

## Permissions and access

### Permissions

- `storage`
- `tabs`
- `declarativeNetRequest`

### Host permissions

- `https://*/*`
- `http://*/*`

### Content script matches

- `<all_urls>`

## Safety

- **Risk impact:** High risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [CORS Unlocker](https://chrome-stats.com/d/cors-unlocker) — 19 users
- [CORS Unblock](https://chrome-stats.com/d/cors-unblock) — 6,345 users, 3.74 / 5
- [CORS Unbound](https://chrome-stats.com/d/cors-unbound) — 20 users
- [I know what I'm doing](https://chrome-stats.com/d/i-know-what-i-m-doing)
- [CORS dev tool](https://chrome-stats.com/d/cors-dev-tool) — 13 users, 3.67 / 5
- [CORS Unblock](https://chrome-stats.com/d/cors-unblock-enable-best) — 446 users
- [CORS for Me](https://chrome-stats.com/d/cors-for-me) — 39 users
- [Allow CORS: Access-Control-Allow-Origin](https://chrome-stats.com/d/access-control-allow-origin) — 8,761 users, 2.68 / 5
- [CORS Everywhere](https://chrome-stats.com/d/cors-everywhere) — 20,823 users, 4.13 / 5
- [Corser](https://chrome-stats.com/d/corser) — 31 users, 3.00 / 5
- [CORS Policy Header Viewer](https://chrome-stats.com/d/cors-policy-header-viewer) — 1 users
- [Custom CORS Control](https://chrome-stats.com/d/custom-cors-control) — 6 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/cors-unblock2)