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COOP Header Remover

ExtensionDeveloper Tools2 users
Item media 1 (screenshot) for COOP Header Remover

Overview

Removes Cross-Origin-Opener-Policy headers from all responses.

Unlock Cross-Origin Interactions for Development and Testing Are strict browser security policies blocking your cross-origin workflows? The Cross-Origin-Opener-Policy (COOP) Remover is a lightweight, developer-focused tool designed to automatically strip the Cross-Origin-Opener-Policy header from all HTTP responses.

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Details

  • Version
    1.0
  • Updated
    December 17, 2025
  • Offered by
    tran_tien
  • Size
    288KiB
  • Languages
    English
  • Developer
    Email
    me@trantien.info
  • Non-trader
    This developer has not identified itself as a trader. For consumers in the European Union, please note that consumer rights do not apply to contracts between you and this developer.

Privacy

The developer has disclosed that it will not collect or use your data.

This developer declares that your data is

  • Not being sold to third parties, outside of the approved use cases
  • Not being used or transferred for purposes that are unrelated to the item's core functionality
  • Not being used or transferred to determine creditworthiness or for lending purposes

Support

Related

CORS Unblock

4.1

No more CORS error by appending 'Access-Control-Allow-Origin: *' header to local and remote web requests when enabled

PiP Unblocker

4.5

Clear Permissions-Policy headers to unblock features like Picture-in-Picture.

Cross Domain - CORS

3.9

Cross Domain will help you to deal with cross domain - CORS problem. This is tool helpful when face with cross domain issue.

Allow CORS: Access-Control-Allow-Origin

3.4

Easily add (Access-Control-Allow-Origin: *) rule to the response header.

Disable-CSP

5.0

A browser extension to disable http header Content-Security-Policy and html meta Content-Security-Policy

ModHeader - Modify HTTP headers

3.0

Modify HTTP request headers, response headers, and redirect URLs

Ignore X-Frame headers

4.4

Drops X-Frame-Options and Content-Security-Policy HTTP response headers, allowing all pages to be iframed.

HTTP Header Modifier

5.0

Modify HTTP request headers for specific URLs

Anti-CORS, anti-CSP

4.3

Enable cross origin requests blocked by CORS or CSP. Disable CORS and CSP in selected hostnames, preserve security of other websites

Popup Blocker (strict)

4.4

Strictly block all popup requests from any website

Modify Http Header

3.8

Modify Http Request Or Response Header.

Content Security Policy (CSP) Generator

4.4

Automatically generate content security policy headers online for any website.

CORS Unblock

4.1

No more CORS error by appending 'Access-Control-Allow-Origin: *' header to local and remote web requests when enabled

PiP Unblocker

4.5

Clear Permissions-Policy headers to unblock features like Picture-in-Picture.

Cross Domain - CORS

3.9

Cross Domain will help you to deal with cross domain - CORS problem. This is tool helpful when face with cross domain issue.

Allow CORS: Access-Control-Allow-Origin

3.4

Easily add (Access-Control-Allow-Origin: *) rule to the response header.

Disable-CSP

5.0

A browser extension to disable http header Content-Security-Policy and html meta Content-Security-Policy

ModHeader - Modify HTTP headers

3.0

Modify HTTP request headers, response headers, and redirect URLs

Ignore X-Frame headers

4.4

Drops X-Frame-Options and Content-Security-Policy HTTP response headers, allowing all pages to be iframed.

HTTP Header Modifier

5.0

Modify HTTP request headers for specific URLs

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