diff --git a/dom/audiochannel/AudioChannelAgent.cpp b/dom/audiochannel/AudioChannelAgent.cpp
index 27af43e4a41..01014f153b2 100644
--- a/dom/audiochannel/AudioChannelAgent.cpp
+++ b/dom/audiochannel/AudioChannelAgent.cpp
@@ -130,6 +130,11 @@ AudioChannelAgent::InitInternal(nsIDOMWindow* aWindow, int32_t aChannelType,
     mCallback = aCallback;
   }
 
+  MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
+         ("AudioChannelAgent, InitInternal, this = %p, type = %d, "
+          "owner = %p, hasCallback = %d\n", this, mAudioChannelType,
+          mWindow.get(), (!!mCallback || !!mWeakCallback)));
+
   return NS_OK;
 }
 
@@ -158,6 +163,10 @@ NS_IMETHODIMP AudioChannelAgent::NotifyStartedPlaying(uint32_t aNotifyPlayback,
 
   service->GetState(mWindow, mAudioChannelType, aVolume, aMuted);
 
+  MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
+         ("AudioChannelAgent, NotifyStartedPlaying, this = %p, mute = %d, "
+          "volume = %f\n", this, *aMuted, *aVolume));
+
   mNotifyPlayback = aNotifyPlayback;
   mIsRegToService = true;
   return NS_OK;
@@ -170,6 +179,9 @@ NS_IMETHODIMP AudioChannelAgent::NotifyStoppedPlaying()
     return NS_ERROR_FAILURE;
   }
 
+  MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
+         ("AudioChannelAgent, NotifyStoppedPlaying, this = %p\n", this));
+
   RefPtr<AudioChannelService> service = AudioChannelService::GetOrCreate();
   service->UnregisterAudioChannelAgent(this, mNotifyPlayback);
   mIsRegToService = false;
@@ -200,6 +212,10 @@ AudioChannelAgent::WindowVolumeChanged()
   RefPtr<AudioChannelService> service = AudioChannelService::GetOrCreate();
   service->GetState(mWindow, mAudioChannelType, &volume, &muted);
 
+  MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
+         ("AudioChannelAgent, WindowVolumeChanged, this = %p, mute = %d, "
+          "volume = %f\n", this, muted, volume));
+
   callback->WindowVolumeChanged(volume, muted);
 }
 
diff --git a/dom/audiochannel/AudioChannelService.cpp b/dom/audiochannel/AudioChannelService.cpp
index b3ef5b8ae6e..18239805a02 100644
--- a/dom/audiochannel/AudioChannelService.cpp
+++ b/dom/audiochannel/AudioChannelService.cpp
@@ -78,6 +78,11 @@ public:
                                      mActive
                                        ? MOZ_UTF16("active")
                                        : MOZ_UTF16("inactive"));
+
+    MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
+           ("NotifyChannelActiveRunnable, type = %d, active = %d\n",
+            mAudioChannel, mActive));
+
     return NS_OK;
   }
 
@@ -178,6 +183,16 @@ AudioChannelService::GetOrCreate()
   return service.forget();
 }
 
+/* static */ PRLogModuleInfo*
+AudioChannelService::GetAudioChannelLog()
+{
+  static PRLogModuleInfo *gAudioChannelLog;
+  if (!gAudioChannelLog) {
+    gAudioChannelLog = PR_NewLogModule("AudioChannel");
+  }
+  return gAudioChannelLog;
+}
+
 void
 AudioChannelService::Shutdown()
 {
@@ -719,6 +734,10 @@ AudioChannelService::SetAudioChannelVolume(nsPIDOMWindow* aWindow,
   MOZ_ASSERT(aWindow);
   MOZ_ASSERT(aWindow->IsOuterWindow());
 
+  MOZ_LOG(GetAudioChannelLog(), LogLevel::Debug,
+         ("AudioChannelService, SetAudioChannelVolume, window = %p, type = %d, "
+          "volume = %d\n", aWindow, aAudioChannel, aVolume));
+
   AudioChannelWindow* winData = GetOrCreateWindowData(aWindow);
   winData->mChannels[(uint32_t)aAudioChannel].mVolume = aVolume;
   RefreshAgentsVolume(aWindow);
@@ -773,6 +792,10 @@ AudioChannelService::SetAudioChannelMuted(nsPIDOMWindow* aWindow,
   MOZ_ASSERT(aWindow);
   MOZ_ASSERT(aWindow->IsOuterWindow());
 
+  MOZ_LOG(GetAudioChannelLog(), LogLevel::Debug,
+         ("AudioChannelService, SetAudioChannelMuted, window = %p, type = %d, "
+          "mute = %d\n", aWindow, aAudioChannel, aMuted));
+
   if (aAudioChannel == AudioChannel::System) {
     // Workaround for bug1183033, system channel type can always playback.
     return;
diff --git a/dom/audiochannel/AudioChannelService.h b/dom/audiochannel/AudioChannelService.h
index 7a5a4728a88..40100c42caf 100644
--- a/dom/audiochannel/AudioChannelService.h
+++ b/dom/audiochannel/AudioChannelService.h
@@ -19,6 +19,7 @@
 
 class nsIRunnable;
 class nsPIDOMWindow;
+class PRLogModuleInfo;
 
 namespace mozilla {
 namespace dom {
@@ -45,6 +46,8 @@ public:
 
   static bool IsAudioChannelMutedByDefault();
 
+  static PRLogModuleInfo* GetAudioChannelLog();
+
   /**
    * Any audio channel agent that starts playing should register itself to
    * this service, sharing the AudioChannel.
diff --git a/dom/browser-element/BrowserElementAudioChannel.cpp b/dom/browser-element/BrowserElementAudioChannel.cpp
index c522b0a10a6..854ad81c50d 100644
--- a/dom/browser-element/BrowserElementAudioChannel.cpp
+++ b/dom/browser-element/BrowserElementAudioChannel.cpp
@@ -68,6 +68,10 @@ BrowserElementAudioChannel::Create(nsPIDOMWindow* aWindow,
     return nullptr;
   }
 
+  MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
+         ("BrowserElementAudioChannel, Create, channel = %p, type = %d\n",
+          ac.get(), aAudioChannel));
+
   return ac.forget();
 }
 
@@ -608,6 +612,10 @@ BrowserElementAudioChannel::Observe(nsISupports* aSubject, const char* aTopic,
 void
 BrowserElementAudioChannel::ProcessStateChanged(const char16_t* aData)
 {
+  MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
+         ("BrowserElementAudioChannel, ProcessStateChanged, this = %p, "
+          "type = %d\n", this, mAudioChannel));
+
   nsAutoString value(aData);
   mState = value.EqualsASCII("active") ? eStateActive : eStateInactive;
   DispatchTrustedEvent(NS_LITERAL_STRING("activestatechanged"));
diff --git a/dom/html/nsBrowserElement.cpp b/dom/html/nsBrowserElement.cpp
index 2b268c564c0..f7485c5df34 100644
--- a/dom/html/nsBrowserElement.cpp
+++ b/dom/html/nsBrowserElement.cpp
@@ -563,6 +563,9 @@ nsBrowserElement::GetAllowedAudioChannels(
       return;
     }
 
+    MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
+            ("nsBrowserElement, GetAllowedAudioChannels, this = %p\n", this));
+
     GenerateAllowedAudioChannels(window, frameLoader, mBrowserElementAPI,
                                  manifestURL, mBrowserElementAudioChannels,
                                  aRv);
diff --git a/dom/ipc/TabChild.cpp b/dom/ipc/TabChild.cpp
index a8a44a98be6..32a164d7d8f 100644
--- a/dom/ipc/TabChild.cpp
+++ b/dom/ipc/TabChild.cpp
@@ -693,6 +693,9 @@ TabChild::Observe(nsISupports *aSubject,
     // In theory a tabChild should contain just 1 top window, but let's double
     // check it comparing the windowID.
     if (window->WindowID() != windowID) {
+      MOZ_LOG(AudioChannelService::GetAudioChannelLog(), LogLevel::Debug,
+              ("TabChild, Observe, different windowID, owner ID = %lld, "
+               "ID from wrapper = %lld", window->WindowID(), windowID));
       return NS_OK;
     }