CORS Unbound

Name: CORS Unbound
Author: yobukodori

Bypass CORS and rewrite HTTP headers directly in the browser, automatically injecting the correct Access-Control-* headers derived from the browser’s CORS request headers.

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Features & Capabilities

CORS Unbound is a Firefox extension that bypasses CORS restrictions and rewrites HTTP request/response headers directly inside the browser. It is designed for local development, prototyping, automation, scraping, and advanced debugging — all without running a server.

Features

Automatic CORS Bypass Injects the appropriate Access-Control-* headers into responses based on the browser’s own CORS request headers.

Header Rewriting Add, modify, or remove request and response headers using a rule-based UI.

Rule System Each rule defines:

Origin URLs (the page making the request)
Target URLs (the request destination)
Header Actions (set/remove)
Resource Types (xmlhttprequest, sub_frame, script, image, websocket, etc.)

Learn more at: https://github.com/yobukodori/cors-unbound

User Growth & Download Statistics

Add-on

By:

yobukodori

Daily users:

5 -1

Version:

1.0.1 Last updated: 2026-04-23

Version code:

6232080

Creation date:

2026-04-19

Risk:

Permissions:

Size:

48.19KB

URLs:

Website ,Privacy policy

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-05

Compare stats and ranking:

Ranking

# 43,794 ▼ 3,231

Other rankings

#249 in destination keyword 3 ▼ 9

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

yobukodori

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/cors-unbound/

Website:

https://github.com/yobukodori/cors-unbound

Is CORS Unbound Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

CORS Unbound requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

CORS Unbound is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
Medium **** ********* *** ******* ** *** **** * ******* *** ******* *** *** ** ****** ** *****
Medium **** ********* *** ***** ** *** **** * ******* *** ********** *** *** ** ****** ** *****