Allow CORS: Access-Control-Allow-Origin

Name: Allow CORS: Access-Control-Allow-Origin
Rating: 3.0641 (78 reviews)
Author: Muyor

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

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Allow CORS: Access-Control-Allow-Origin is a Chrome extension that simplifies performing cross-domain Ajax requests by automatically adding the Access-Control-Allow-Origin: * header to response headers. This is especially useful because modern browsers block Cross-Origin Resource Sharing (CORS) by default in JavaScript APIs.

Once installed, the extension stays inactive until you activate it via the toolbar icon, which changes color to indicate its status. This tool empowers developers and testers to bypass CORS restrictions without modifying server configurations. For bug reports or feature suggestions, users can refer to the add-on's homepage.

Developer Tools Productivity Programming

By:

Muyor

Daily users:

11,564+ -133

Rating:

3.06

(78) 1 new ratings

Version:

0.2.0 Last updated: 2024-11-04

Version code:

5832395

Creation date:

2018-04-25

Risk:

Permissions:

storage
webRequest
declarativeNetRequest

Host permissions:

<all_urls>

Size:

82.44K

Email:

mu*****@gmail.com

URLs:

Website

Full description:

See detailed description ⏷

Source:

Firefox Browser Add-ons

Updated:

a day ago

Ranking

# 710 ▼ 6

Other rankings

#63 in Web Development

#109 in Other extensions ▲ 1

#158 in Privacy & Security ▼ 3

#7 in free access keyword 56

#11 in zillow keyword 12

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Other platforms

Allow CORS: Access-Control-Allow-Origin (v0.2.0)

800,000+ 3.40

(282)

Allow CORS: Access-Control-Allow-Origin (v0.2.0)

148,650+ 3.70

(6)

User reviews

Users generally agree the add-on succeeds in its intended function, but a critical and recurring issue is excessive CPU and memory usage. Many reviews report the extension running in the background unknowingly, causing system slowdowns, high power consumption, and degraded performance. While it works technically, resource usage issues undermine the user experience significantly. Fixing these bugs is essential to make it a viable tool.

Pros

The add-on functions as intended and fulfills its purpose.
Some users acknowledge that it works well apart from issues mentioned.
It can be identified and disabled to reduce CPU usage.
It is effective in allowing CORS policy modifications.

Cons

Causes extremely high CPU usage, often running constantly in the background.
Consumes large amounts of RAM, leading to performance degradation.
May cause significant battery drain, especially on laptops or Macs.
Runs background processes even when the browser is idle or with blank tabs.
Has potential memory leaks or buggy behavior leading to resource hogging.

Recent reviews

Unlike some of the reviews suggest, this isn't malware, but it does have a bug that causes it to use up a lot of CPU - other than that works great!

by 0xivb, 2025-05-07

by bär, 2025-04-12

by 远离中共邪教快退出党团队, 2025-04-06

View all user reviews ›

Extension safety

Risk impact

Allow CORS: Access-Control-Allow-Origin 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

Allow CORS: Access-Control-Allow-Origin is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

Medium This extension has medium user count. Unpopular extensions may not be stable or safe.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
Good **** ********* *** **** **** *******

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