Easily add (Access-Control-Allow-Origin: *) rule to the header. This allows you to test out your web software/websites while you are debugging/coding. Worry about CORs issues once you are ready to deploy your website. Dont worry about CORs errors while you in the midst of developing your web application Allow CORS: Access-Control-Allow-Origin lets you perform cross-domain Ajax requests in web applications. Simply switch on the add-on and perform the request. CORS or Cross Origin Resource Sharing is blocked in modern browsers by default. Installing this add-on will allow you to unblock this feature. Please note that, when the add-on is added to your browser, it is not switched on by default for security purposes. Please note CORS blocking is useful/a safety feature for most users. The main reason to unblock CORS is to test out your web application/develop a web feature. This extension is meant for developers/programmers and not for everyday users. Disclaimer: Please note this extension is NOT made by Google and is made by an independent development team. All copyrights belong to their respective owners. Google doesn’t endorse or sponsor this Chrome extension CORS Unblock for Google Chrome™ is not owned by, is not licensed by and is not a subsidiary of Google Inc.