# CORS dev tool

> Lightweight CORS web development tool allows developers to modify Ajax responses Access-Control-Allow-Origin: \* and other configurations

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

## Overview

- **ID:** `cors-dev-tool`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Atom
- **Category:** web-development
- **Daily users:** 13
- **Rating:** 3.67 / 5 (3 ratings)
- **Version:** 1.1.4
- **Last updated:** 2020-08-24
- **First published:** 2019-05-24
- **Size:** 66 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/cors-dev-tool/)
- **Website:** [https://github.com/jhrxx/CORS-dev-tool](https://github.com/jhrxx/CORS-dev-tool)

## Description

CORS dev tool is a lightweight Firefox add-on that allows developers to modify Ajax responses and configure Cross-Origin Resource Sharing (CORS) headers. It enables users to customize Access-Control-Allow-Origin, Access-Control-Expose-Headers, Access-Control-Max-Age, Access-Control-Allow-Credentials, Access-Control-Allow-Methods, and Access-Control-Allow-Headers headers to grant access to specified resources from different source servers.

## Rankings

- #29,215 — Overall
- #161 — tool
- #179 — course
- #199 — configure

## Permissions and access

### Permissions

- `*://janbao.net/*`
- `*://jandan.net/*`
- `*://*.jandan.net/*`

### Content script matches

- `janbao.net`
- `jandan.net`
- `*.jandan.net`

## Safety

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

### Analysis details

- Injects scripts into web pages, which may alter or extract site contents, resulting in a substantial risk.
- 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).

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- [Allow CORS: Access-Control-Allow-Origin](https://chrome-stats.com/d/access-control-allow-origin) — 8,761 users, 2.68 / 5

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