Simply modify the project's web.config as shown below. Note, you have to enable .NET profiling before you launch Visual Studio. For some reason, it seems to take more than once at times, too. But the detail you get is awesome.
<modules runAllManagedModulesForAllRequests="true" > <remove name="StackifyModule_Net40" /> <add name="StackifyModule_Net40" type="StackifyHttpTracer.StackifyHttpModule,StackifyHttpTracer, Version=126.96.36.199, Culture=neutral, PublicKeyToken=93c44ce23f2048dd" preCondition="managedHandler,runtimeVersionv4.0" /> </modules>
There are other ways to enable Prefix, but this was the easiest for me.