IIS7 ASP.NET Web server not processing POST requests

I have this method: Application_PreRequestHandlerExecute in my Global.asax.cs file for my web application. For GET requests, break points are being hit just fine and processing the data correctly. However, for POST requests, no break point is getting hit.

I am testing POST requests via chrome/firefox extensions with no luck. Any ideas why POST requests sent via chrome/firefox extensions aren't being fully processed by my web app? Maybe I need to make a change to my web.config file? Maybe I cant use an extension to test out a request like this? This application has never supported POST before.

Thanks!