Update README.md

README.md

@@ -57,11 +57,17 @@ As a consequence, you will need
 
 ## Browser Troubleshooting ##
 
-Modern browser security may cause a lot of trouble when a web application wants to communicate with servers that have not been configured properly. If you know what you are doing, you may lower specific security levels in order to get the experience you expect.
+Modern browser security may cause a lot of trouble when a web application wants to communicate with servers that have not been configured properly. If you know what you are doing, you may lower certain security levels in order to get the experience you expect.
 
 ### CORS ###
 
-t.b.w.
+Cross-Origin Resource Sharing (CORS) is a security feature implemented in web browsers that allows or restricts web pages from making requests to a domain different from the one that served the web page. It is needed to prevent malicious websites from accessing sensitive data on other domains without permission, thereby protecting user data and maintaining web security.
+
+Incorrect CORS settings of a server can block legitimate requests from different domains, leading to functionality issues in web applications. This often results in CORS errors, where the browser blocks the request due to a lack of proper authorization from the server.
+
+To get rid of CORS errors as a browser user, you may install a browser extension that adds the necessary CORS headers to server requests, allowing cross-origin requests to succeed. However, this method should be used only for development purposes, as it can introduce security risks if used indiscriminately
+
+![CORS Unblocking Extension](CORS-Unblocking.png)
 
 ### Communicating with your own PC ###