--- a/dom/media/MediaDevices.cpp
+++ b/dom/media/MediaDevices.cpp
@@ -4,16 +4,17 @@
 
 #include "mozilla/dom/MediaDevices.h"
 #include "mozilla/dom/MediaStreamBinding.h"
 #include "mozilla/dom/MediaDeviceInfo.h"
 #include "mozilla/dom/MediaDevicesBinding.h"
 #include "mozilla/dom/Promise.h"
 #include "mozilla/MediaManager.h"
 #include "MediaTrackConstraints.h"
+#include "nsContentUtils.h"
 #include "nsIEventTarget.h"
 #include "nsINamed.h"
 #include "nsIScriptGlobalObject.h"
 #include "nsIPermissionManager.h"
 #include "nsPIDOMWindow.h"
 #include "nsQueryObject.h"
 
 #define DEVICECHANGE_HOLD_TIME_IN_MS 1000
@@ -227,16 +228,22 @@ MediaDevices::OnDeviceChange()
     return;
   }
 
   if (!(MediaManager::Get()->IsActivelyCapturingOrHasAPermission(GetOwner()->WindowID()) ||
     Preferences::GetBool("media.navigator.permission.disabled", false))) {
     return;
   }
 
+  // Do not fire event to content script when
+  // privacy.resistFingerprinting is true.
+  if (nsContentUtils::ShouldResistFingerprinting()) {
+    return;
+  }
+
   if (!mFuzzTimer)
   {
     mFuzzTimer = NS_NewTimer();
   }
 
   if (!mFuzzTimer) {
     MOZ_ASSERT(false);
     return;