--- a/dom/network/Connection.cpp
+++ b/dom/network/Connection.cpp
@@ -95,17 +95,18 @@ Connection::Update(ConnectionType aType,
   NS_ASSERT_OWNINGTHREAD(Connection);
 
   ConnectionType previousType = mType;
 
   mType = aType;
   mIsWifi = aIsWifi;
   mDHCPGateway = aDHCPGateway;
 
-  if (aNotify && previousType != aType) {
+  if (aNotify && previousType != aType &&
+      !nsContentUtils::ShouldResistFingerprinting()) {
     DispatchTrustedEvent(CHANGE_EVENT_NAME);
   }
 }
 
 /* static */ bool
 Connection::IsEnabled(JSContext* aCx, JSObject* aObj)
 {
   if (NS_IsMainThread()) {

--- a/dom/network/Connection.h
+++ b/dom/network/Connection.h
@@ -4,16 +4,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #ifndef mozilla_dom_network_Connection_h
 #define mozilla_dom_network_Connection_h
 
 #include "mozilla/DOMEventTargetHelper.h"
 #include "mozilla/dom/NetworkInformationBinding.h"
+#include "nsContentUtils.h"
 #include "nsCycleCollectionParticipant.h"
 #include "nsINetworkProperties.h"
 
 namespace mozilla {
 
 namespace hal {
 class NetworkInformation;
 } // namespace hal
@@ -47,17 +48,21 @@ public:
 
   void Shutdown();
 
   // WebIDL
 
   virtual JSObject* WrapObject(JSContext* aCx,
                                JS::Handle<JSObject*> aGivenProto) override;
 
-  ConnectionType Type() const { return mType; }
+  ConnectionType Type() const
+  {
+    return nsContentUtils::ShouldResistFingerprinting() ?
+             static_cast<ConnectionType>(ConnectionType::Unknown) : mType;
+  }
 
   IMPL_EVENT_HANDLER(typechange)
 
 protected:
   Connection(nsPIDOMWindowInner* aWindow);
   virtual ~Connection();
 
   void Update(ConnectionType aType, bool aIsWifi, bool aDHCPGateway,