diff --git a/dom/locales/en-US/chrome/dom/dom.properties b/dom/locales/en-US/chrome/dom/dom.properties
index c3d216bea0f6..c23163a04912 100644
--- a/dom/locales/en-US/chrome/dom/dom.properties
+++ b/dom/locales/en-US/chrome/dom/dom.properties
@@ -93,6 +93,10 @@ MediaDecodeAudioDataUnknownError=An unknown error occured while processing decod
 MediaDecodeAudioDataInvalidContent=The buffer passed to decodeAudioData contains invalid content which cannot be decoded successfully.
 # LOCALIZATION NOTE: Do not translate decodeAudioData.
 MediaDecodeAudioDataNoAudio=The buffer passed to decodeAudioData does not contain any audio.
+# LOCALIZATION NOTE: Do not translate HTMLMediaElement and createMediaElementSource.
+MediaElementAudioSourceNodeCrossOrigin=The HTMLMediaElement passed to createMediaElementSource has a cross-origin resource, the node will output silence.
+# LOCALIZATION NOTE: Do not translate MediaStream and createMediaStreamSource.
+MediaStreamAudioSourceNodeCrossOrigin=The MediaStream passed to createMediaStreamSource has a cross-origin resource, the node it will output silence.
 MediaLoadExhaustedCandidates=All candidate resources failed to load. Media load paused.
 MediaLoadSourceMissingSrc=<source> element has no "src" attribute. Media resource load failed.
 # LOCALIZATION NOTE: %1$S is the Http error code the server returned (e.g. 404, 500, etc), %2$S is the URL of the media resource which failed to load.
diff --git a/dom/media/webaudio/MediaElementAudioSourceNode.h b/dom/media/webaudio/MediaElementAudioSourceNode.h
index 1a77dd964a69..f6791f355afb 100644
--- a/dom/media/webaudio/MediaElementAudioSourceNode.h
+++ b/dom/media/webaudio/MediaElementAudioSourceNode.h
@@ -25,6 +25,11 @@ public:
     return "MediaElementAudioSourceNode";
   }
 
+  const char* CrossOriginErrorString() const override
+  {
+    return "MediaElementAudioSourceNodeCrossOrigin";
+  }
+
   size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override
   {
     return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
diff --git a/dom/media/webaudio/MediaStreamAudioSourceNode.cpp b/dom/media/webaudio/MediaStreamAudioSourceNode.cpp
index f9905f520f71..639208e7a1d7 100644
--- a/dom/media/webaudio/MediaStreamAudioSourceNode.cpp
+++ b/dom/media/webaudio/MediaStreamAudioSourceNode.cpp
@@ -165,8 +165,9 @@ MediaStreamAudioSourceNode::PrincipalChanged(MediaStreamTrack* aMediaStreamTrack
   MOZ_ASSERT(aMediaStreamTrack == mInputTrack);
 
   bool subsumes = false;
+  nsIDocument* doc = nullptr;
   if (nsPIDOMWindowInner* parent = Context()->GetParentObject()) {
-    nsIDocument* doc = parent->GetExtantDoc();
+    doc = parent->GetExtantDoc();
     if (doc) {
       nsIPrincipal* docPrincipal = doc->NodePrincipal();
       nsIPrincipal* trackPrincipal = aMediaStreamTrack->GetPrincipal();
@@ -176,8 +177,16 @@ MediaStreamAudioSourceNode::PrincipalChanged(MediaStreamTrack* aMediaStreamTrack
     }
   }
   auto stream = static_cast<AudioNodeExternalInputStream*>(mStream.get());
-  stream->SetInt32Parameter(MediaStreamAudioSourceNodeEngine::ENABLE,
-                            subsumes || aMediaStreamTrack->GetCORSMode() != CORS_NONE);
+  bool enabled = subsumes || aMediaStreamTrack->GetCORSMode() != CORS_NONE;
+  stream->SetInt32Parameter(MediaStreamAudioSourceNodeEngine::ENABLE, enabled);
+
+  if (!enabled && doc) {
+    nsContentUtils::ReportToConsole(nsIScriptError::warningFlag,
+                                    NS_LITERAL_CSTRING("Web Audio"),
+                                    doc,
+                                    nsContentUtils::eDOM_PROPERTIES,
+                                    CrossOriginErrorString());
+  }
 }
 
 size_t
diff --git a/dom/media/webaudio/MediaStreamAudioSourceNode.h b/dom/media/webaudio/MediaStreamAudioSourceNode.h
index fc6049838ea5..10df404fe9e5 100644
--- a/dom/media/webaudio/MediaStreamAudioSourceNode.h
+++ b/dom/media/webaudio/MediaStreamAudioSourceNode.h
@@ -62,6 +62,11 @@ public:
     return "MediaStreamAudioSourceNode";
   }
 
+  virtual const char* CrossOriginErrorString() const
+  {
+    return "MediaStreamAudioSourceNodeCrossOrigin";
+  }
+
   size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override;
   size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override;