fix headers

Author: Pablo Gonzalez

articles/frontdoor/refstring.md

@@ -14,12 +14,10 @@ ms.date: 09/06/2024
 
 A guide to understand and use RefStrings for diagnosing and resolving issues with Azure Front Door.
 
-
 ## Prerequisites
 
 * You must have an Azure Front Door profile. To create a profile, see [Creating an Azure Front Door profile](create-front-door-portal.md).
 
-
 ## What is a RefString?
 
 A RefString is a short string appended by Azure Front Door to the HTTP response headers of each request. It provides details on how the request was processed, including the point of presence (POP) and backend status.
@@ -33,6 +31,8 @@ RefStrings can help you troubleshoot and resolve issues with Azure Front Door, s
 
 To gather a RefString, you need to capture the HTTP response headers of the requests and look for the header named **X-Azure-Ref**. This header contains the RefString, encoded in Base64. You can use different methods to capture the HTTP response headers, depending on your preference and situation. Here are a few examples of how to obtain a RefString from various browsers and applications:
 
+#### [Microsoft Edge Browser](#tab/edge)
+
 1. Open the browser's developer tools by pressing `F12` or `Ctrl+Shift+I`.
 
 1. Go to the **Network** tab.
@@ -67,6 +67,8 @@ To obtain headers with cURL, use the **-I** or **—include** option to include
 
 To learn more about viewing and capturing network traffic with Fiddler, see [Web Debugging - Capture Network Traffic](https://www.telerik.com/fiddler/usecases/web-debugging). 
 
+---
+
 ## How to use a RefString with some of our troubleshooting tools?
 Azure Front Door uses a RefString to manage 4xx and 5xx errors. The following are the steps to use the diagnostic tool with a RefString for tracking and diagnosing connectivity issues: