--- a/toolkit/xre/nsEmbedFunctions.cpp
+++ b/toolkit/xre/nsEmbedFunctions.cpp
@@ -90,16 +90,20 @@
 using mozilla::_ipdltest::IPDLUnitTestProcessChild;
 #endif  // ifdef MOZ_IPDL_TESTS
 
 #ifdef MOZ_B2G_LOADER
 #include "nsLocalFile.h"
 #include "nsXREAppData.h"
 #endif
 
+#ifdef MOZ_JPROF
+#include "jprof.h"
+#endif
+
 using namespace mozilla;
 
 using mozilla::ipc::BrowserProcessSubThread;
 using mozilla::ipc::GeckoChildProcessHost;
 using mozilla::ipc::IOThreadChild;
 using mozilla::ipc::ProcessChild;
 using mozilla::ipc::ScopedXREEmbed;
 
@@ -302,16 +306,21 @@ XRE_InitChildProcess(int aArgc,
   NS_ENSURE_ARG_MIN(aArgc, 2);
   NS_ENSURE_ARG_POINTER(aArgv);
   NS_ENSURE_ARG_POINTER(aArgv[0]);
 
 #ifdef HAS_DLL_BLOCKLIST
   DllBlocklist_Initialize();
 #endif
 
+#ifdef MOZ_JPROF
+  // Call the code to install our handler
+  setupProfilingStuff();
+#endif
+
   // This is needed by Telemetry to initialize histogram collection.
   UniquePtr<base::StatisticsRecorder> statisticsRecorder =
     MakeUnique<base::StatisticsRecorder>();
 
 #if !defined(MOZ_WIDGET_ANDROID) && !defined(MOZ_WIDGET_GONK)
   // On non-Fennec Gecko, the GMPLoader code resides in plugin-container,
   // and we must forward it through to the GMP code here.
   GMPProcessChild::SetGMPLoader(aGMPLoader);