CORS Unblock

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

CORS Unblock

Say goodbye to CORS errors! The CORS Unblock Firefox add-on allows seamless web requests by appending Access-Control-Allow-Origin headers. Control XMLHttpRequest and fetch methods effortlessly. Toggle the extension from the toolbar, customize allowed methods (e.g. GET, POST, DELETE), and choose whether to overwrite existing headers. Ideal for developers needing flexibility in handling CORS issues.

Features:

  • Easily append CORS headers to requests.
  • Control request methods using a user-friendly interface.
  • Toggle functionality directly from your toolbar.
  • Customize behavior via context menus.

Perfect for integrating with any web application without hitting CORS roadblocks!

Download
Manifest V2
By: Balvin
Daily users: 7,239
-118
Rating: 3.91
(33)
Version: 0.3.8 (Last updated: 2024-02-11)
Version code: 5690645
Creation date: 2019-01-22
Weekly download count: 361
Firefox on Android: No
Risk: High risk impact Low risk likelihood
Permissions:
  • storage
  • <all_urls>
  • webRequest
  • webRequestBlocking
  • declarativeNetRequest
  • contextMenus
Size: 211.30K
URLs: Website
Full description: See detailed description
Updated: a day ago

Ranking

# 958 ▼ 3
Other rankings
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Other platforms

CORS Unblock (v0.3.8)
100,000 4.19 (168)
CORS Unblock (v0.3.8)
58,400 4.30 (12)

User reviews

Pros
  • Works as intended for some users
  • Useful for frontend developers
  • Ability to modify "Access-Control-Expose-Headers"
  • Simple toggle interface to enable/disable
Cons
  • Many users report that it does not work
  • No whitelist option for specific sites
  • Could cause issues on certain websites
  • Inconsistent performance across different Firefox versions
Most mentioned
  • Does not work for many users
  • Requests for a whitelist feature
  • Generally effective when it works
  • Issues with YouTube playback
These summaries are automatically generated weekly using AI based on recent user reviews. User reviews may be inaccurate, spammy, or outdated.
User reviews
by 远离中共邪教快退出党团队, 2025-03-24
Un desastre...no funciona...como si no existiera..
by marcelito69, 2025-02-16
by 退出中共邪教党团队避疫, 2025-02-10
View all user reviews

Add-on safety

Risk impact
High risk impact

CORS Unblock requires some sensitive permissions that could impact your browser and data security. 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.
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  • Low ******* ****** ** *** ********* ********
Risk likelihood
Low risk likelihood

CORS Unblock has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
  • Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* *** **** **** *******
Upgrade to see full risk analysis details

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