Compare: Allow CORS: Access-Control-Allow-Origin vs CORS Unblock

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Metric	Allow CORS: Access-Control-Allow-Origin	CORS Unblock
User count	800,000	200,000
Average rating	3.42	4.08
Rating count	293	175
Last updated	2026-04-01	2025-06-03
Size	0.09 MB	0.20 MB
Version	0.2.2	0.5.2

Short description	Easily enable cross-domain Ajax requests by adding Access-Control-Allow-Origin header with this Chrome extension. Simple toggle activation.	CORS Unblock Chrome extension bypasses CORS errors by appending 'Access-Control-Allow-Origin: *' headers to web requests. Activate with one click!
Full summary	Allow CORS: Access-Control-Allow-Origin is a handy Chrome extension that simplifies enabling cross-domain Ajax requests for web developers. By adding the header Access-Control-Allow-Origin: * to response headers, it lets you bypass the default CORS restrictions imposed by modern browsers on JavaScript APIs. Once installed, the extension remains inactive by default, indicated by a grey 'C' icon in the toolbar. Users can activate it via the toolbar popup, turning the icon orange, to start performing cross-origin requests seamlessly. It’s an essential tool for developers debugging or developing web applications that need to communicate with APIs hosted on different domains. For feedback or bug reporting, the extension provides a form on its homepage. Overall, it offers a simple toggle solution to a common web development challenge with CORS policies.	CORS Unblock is a powerful Chrome extension designed to bypass the common Cross-Origin Resource Sharing (CORS) errors encountered during web development. By appending and modifying headers such as 'Access-Control-Allow-Origin' and 'Access-Control-Allow-Methods', it enables smooth communication between local and remote web requests. Users can activate it easily with a single click and customize which headers to manipulate via the right-click context menu. Beyond basic header modification, the extension offers advanced features: removing Content Security Policy headers to avoid content restrictions, allowing cross-origin frame embedding by removing 'X-Frame-Options', overriding 4xx server responses to simulate support for unsupported methods, and controlling sensitive headers like 'referer' and 'origin' to ensure compatibility with strict servers. It also optionally fixes CORS on redirected URLs and supports SharedArrayBuffer class emulation. This extension is an essential tool for developers tackling cross-origin restrictions effectively.