diff --git a/netwerk/base/src/PrivateBrowsingChannel.h b/netwerk/base/src/PrivateBrowsingChannel.h
index 451915c4cc1a..367ebe4d997b 100644
--- a/netwerk/base/src/PrivateBrowsingChannel.h
+++ b/netwerk/base/src/PrivateBrowsingChannel.h
@@ -11,6 +11,8 @@
 #include "nsCOMPtr.h"
 #include "nsILoadGroup.h"
 #include "nsILoadContext.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIInterfaceRequestor.h"
 
 namespace mozilla {
 namespace net {
@@ -56,19 +58,35 @@ public:
       return NS_OK;
   }
 
-  bool CanSetCallbacks() const
+  bool CanSetCallbacks(nsIInterfaceRequestor* aCallbacks) const
   {
       // Make sure that the private bit override flag is not set.
       // This is a fatal error in debug builds, and a runtime error in release
       // builds.
+      if (!aCallbacks) {
+          return true;
+      }
+      nsCOMPtr<nsILoadContext> loadContext = do_GetInterface(aCallbacks);
+      if (!loadContext) {
+          return true;
+      }
       MOZ_ASSERT(!mPrivateBrowsingOverriden);
       return !mPrivateBrowsingOverriden;
   }
 
-  bool CanSetLoadGroup() const
+  bool CanSetLoadGroup(nsILoadGroup* aLoadGroup) const
   {
-      // We can set a load group whenever we can set a callback
-      return CanSetCallbacks();
+      // Make sure that the private bit override flag is not set.
+      // This is a fatal error in debug builds, and a runtime error in release
+      // builds.
+      if (!aLoadGroup) {
+          return true;
+      }
+      nsCOMPtr<nsIInterfaceRequestor> callbacks;
+      aLoadGroup->GetNotificationCallbacks(getter_AddRefs(callbacks));
+      // From this point on, we just hand off the work to CanSetCallbacks,
+      // because the logic is exactly the same.
+      return CanSetCallbacks(callbacks);
   }
 
 protected:
diff --git a/netwerk/protocol/ftp/FTPChannelChild.cpp b/netwerk/protocol/ftp/FTPChannelChild.cpp
index f6a3759475de..58af33162536 100644
--- a/netwerk/protocol/ftp/FTPChannelChild.cpp
+++ b/netwerk/protocol/ftp/FTPChannelChild.cpp
@@ -550,7 +550,7 @@ FTPChannelChild::CompleteRedirectSetup(nsIStreamListener *listener,
 NS_IMETHODIMP
 FTPChannelChild::SetNotificationCallbacks(nsIInterfaceRequestor* aCallbacks)
 {
-  if (!CanSetCallbacks()) {
+  if (!CanSetCallbacks(aCallbacks)) {
     return NS_ERROR_FAILURE;
   }
 
@@ -560,7 +560,7 @@ FTPChannelChild::SetNotificationCallbacks(nsIInterfaceRequestor* aCallbacks)
 NS_IMETHODIMP
 FTPChannelChild::SetLoadGroup(nsILoadGroup * aLoadGroup)
 {
-  if (!CanSetLoadGroup()) {
+  if (!CanSetLoadGroup(aLoadGroup)) {
     return NS_ERROR_FAILURE;
   }
 
diff --git a/netwerk/protocol/ftp/nsFTPChannel.cpp b/netwerk/protocol/ftp/nsFTPChannel.cpp
index 0866805f17fe..4a3ca176382f 100644
--- a/netwerk/protocol/ftp/nsFTPChannel.cpp
+++ b/netwerk/protocol/ftp/nsFTPChannel.cpp
@@ -222,7 +222,7 @@ nsFtpChannel::GetFTPEventSink(nsCOMPtr<nsIFTPEventSink> &aResult)
 NS_IMETHODIMP
 nsFtpChannel::SetNotificationCallbacks(nsIInterfaceRequestor* aCallbacks)
 {
-  if (!CanSetCallbacks()) {
+  if (!CanSetCallbacks(aCallbacks)) {
     return NS_ERROR_FAILURE;
   }
 
@@ -232,7 +232,7 @@ nsFtpChannel::SetNotificationCallbacks(nsIInterfaceRequestor* aCallbacks)
 NS_IMETHODIMP
 nsFtpChannel::SetLoadGroup(nsILoadGroup * aLoadGroup)
 {
-  if (!CanSetLoadGroup()) {
+  if (!CanSetLoadGroup(aLoadGroup)) {
     return NS_ERROR_FAILURE;
   }
 
diff --git a/netwerk/protocol/http/HttpBaseChannel.cpp b/netwerk/protocol/http/HttpBaseChannel.cpp
index cf73b391bc0b..02d28bee4954 100644
--- a/netwerk/protocol/http/HttpBaseChannel.cpp
+++ b/netwerk/protocol/http/HttpBaseChannel.cpp
@@ -189,7 +189,7 @@ HttpBaseChannel::GetLoadGroup(nsILoadGroup **aLoadGroup)
 NS_IMETHODIMP
 HttpBaseChannel::SetLoadGroup(nsILoadGroup *aLoadGroup)
 {
-  if (!CanSetLoadGroup()) {
+  if (!CanSetLoadGroup(aLoadGroup)) {
     return NS_ERROR_FAILURE;
   }
 
@@ -273,7 +273,7 @@ HttpBaseChannel::GetNotificationCallbacks(nsIInterfaceRequestor **aCallbacks)
 NS_IMETHODIMP
 HttpBaseChannel::SetNotificationCallbacks(nsIInterfaceRequestor *aCallbacks)
 {
-  if (!CanSetCallbacks()) {
+  if (!CanSetCallbacks(aCallbacks)) {
     return NS_ERROR_FAILURE;
   }
 
diff --git a/netwerk/protocol/wyciwyg/WyciwygChannelChild.cpp b/netwerk/protocol/wyciwyg/WyciwygChannelChild.cpp
index 0a8da5ed31d0..98cc0eea4853 100644
--- a/netwerk/protocol/wyciwyg/WyciwygChannelChild.cpp
+++ b/netwerk/protocol/wyciwyg/WyciwygChannelChild.cpp
@@ -385,7 +385,7 @@ WyciwygChannelChild::GetLoadGroup(nsILoadGroup * *aLoadGroup)
 NS_IMETHODIMP
 WyciwygChannelChild::SetLoadGroup(nsILoadGroup * aLoadGroup)
 {
-  if (!CanSetLoadGroup()) {
+  if (!CanSetLoadGroup(aLoadGroup)) {
     return NS_ERROR_FAILURE;
   }
 
@@ -471,7 +471,7 @@ WyciwygChannelChild::GetNotificationCallbacks(nsIInterfaceRequestor * *aCallback
 NS_IMETHODIMP
 WyciwygChannelChild::SetNotificationCallbacks(nsIInterfaceRequestor * aCallbacks)
 {
-  if (!CanSetCallbacks()) {
+  if (!CanSetCallbacks(aCallbacks)) {
     return NS_ERROR_FAILURE;
   }
 
diff --git a/netwerk/protocol/wyciwyg/nsWyciwygChannel.cpp b/netwerk/protocol/wyciwyg/nsWyciwygChannel.cpp
index f687eaea7480..f40aa36c4d61 100644
--- a/netwerk/protocol/wyciwyg/nsWyciwygChannel.cpp
+++ b/netwerk/protocol/wyciwyg/nsWyciwygChannel.cpp
@@ -188,7 +188,7 @@ nsWyciwygChannel::GetLoadGroup(nsILoadGroup* *aLoadGroup)
 NS_IMETHODIMP
 nsWyciwygChannel::SetLoadGroup(nsILoadGroup* aLoadGroup)
 {
-  if (!CanSetLoadGroup()) {
+  if (!CanSetLoadGroup(aLoadGroup)) {
     return NS_ERROR_FAILURE;
   }
 
@@ -271,7 +271,7 @@ nsWyciwygChannel::GetNotificationCallbacks(nsIInterfaceRequestor* *aCallbacks)
 NS_IMETHODIMP
 nsWyciwygChannel::SetNotificationCallbacks(nsIInterfaceRequestor* aNotificationCallbacks)
 {
-  if (!CanSetCallbacks()) {
+  if (!CanSetCallbacks(aNotificationCallbacks)) {
     return NS_ERROR_FAILURE;
   }