CORS Unblock
No more CORS error by appending 'Access-Control-Allow-Origin: *' header to local and remote web requests when enabled
CORS Unblock - Eliminate CORS Errors in Firefox
"CORS Unblock" is a Firefox extension offering control over XMLHttpRequest and fetch methods. It appends custom 'access-control-allow-origin' and 'access-control-allow-methods' headers to every browser request, resolving CORS (Cross Origin Resource Sharing) errors. Its features include toggling on/off from the toolbar, customizing allowed methods, and options to not overwrite server-filled headers. Supports WEBDAV methods.
Add-on stats
Manifest V2
Weekly download count: 414
Firefox on Android: No
Permissions:
- storage
- <all_urls>
- webRequest
- webRequestBlocking
- declarativeNetRequest
- contextMenus
Size: 211.30K
URLs: Website
Full description: See detailed description
Ranking
# 946 ▼ 2
Other platforms
Not available on Android
User reviews
These summaries are automatically generated weekly using AI based on recent user reviews.
Firefox Browser Add-ons does not verify user reviews, so some user reviews may be inaccurate,
spammy, or outdated. Pros
- Does what it's supposed to do
- Works well for frontend developers
- Ability to modify 'Access-Control-Expose-Headers'
- Easy to enable/disable the extension
Cons
- Does not work in multiple Firefox versions
- Some sites may not function correctly with the extension enabled
- No option to whitelist specific sites
- Does not work for specific use cases like YouTube
Most mentioned
- Does not work or is unreliable
- Some features could be improved (e.g., whitelisting)
- Functions well when it works
- Promising but often fails in certain Firefox versions
User reviews
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
This extension does what it's supposed to do. Thanks. I don't keep it as I only used it for testing and you're not supposed to solve CORS issues like this.
by Firefox user 13729324, 2025-01-28
Add-on safety
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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Risk likelihood
We don't have sufficient data to confidently determine the risk likelihood of CORS Unblock. Use it at your own risk.
Risk likelihood analysis details
- High This extension has low user count. Unpopular extensions may not be stable or safe.
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