Add Firefox to intro

Author: mgblythe

articles/azure-portal/capture-browser-trace.md

@@ -14,7 +14,7 @@ manager:  mtillman
 
 # Capture a browser trace for troubleshooting
 
-If you're troubleshooting an issue with the Azure portal, and you need to contact Microsoft support, we recommend you first capture a browser trace and some additional information. The information you collect can provide important details about the portal at the time the issue occurs. Follow the steps in this article for the developer tools in the browser you use: Google Chrome or Microsoft Edge (Chromium), Microsoft Edge (EdgeHTML), or Apple Safari.
+If you're troubleshooting an issue with the Azure portal, and you need to contact Microsoft support, we recommend you first capture a browser trace and some additional information. The information you collect can provide important details about the portal at the time the issue occurs. Follow the steps in this article for the developer tools in the browser you use: Google Chrome or Microsoft Edge (Chromium), Microsoft Edge (EdgeHTML), Apple Safari, or Firefox.
 
 ## Google Chrome and Microsoft Edge (Chromium)