diff --git a/dom/audiochannel/AudioChannelService.cpp b/dom/audiochannel/AudioChannelService.cpp
index 855499eea945..42d6ea0dbf3a 100644
--- a/dom/audiochannel/AudioChannelService.cpp
+++ b/dom/audiochannel/AudioChannelService.cpp
@@ -448,7 +448,7 @@ AudioChannelService::SendAudioChannelChangedNotification(uint64_t aChildID)
   }
 
   // Calculating the most important active channel.
-  AudioChannelType higher = AUDIO_CHANNEL_LAST;
+  AudioChannelType higher = AUDIO_CHANNEL_DEFAULT;
 
   // Top-Down in the hierarchy for visible elements
   if (!mChannelCounters[AUDIO_CHANNEL_INT_PUBLICNOTIFICATION].IsEmpty()) {
@@ -482,30 +482,19 @@ AudioChannelService::SendAudioChannelChangedNotification(uint64_t aChildID)
   AudioChannelType visibleHigher = higher;
 
   // Top-Down in the hierarchy for non-visible elements
-  if (higher == AUDIO_CHANNEL_LAST) {
-    if (!mChannelCounters[AUDIO_CHANNEL_INT_PUBLICNOTIFICATION_HIDDEN].IsEmpty()) {
-      higher = AUDIO_CHANNEL_PUBLICNOTIFICATION;
+  // And we can ignore normal channel because it can't play in the background.
+  for (int i = AUDIO_CHANNEL_LAST - 1;
+       i > higher && i > AUDIO_CHANNEL_NORMAL; i--) {
+    if (i == AUDIO_CHANNEL_CONTENT &&
+      mPlayableHiddenContentChildID != CONTENT_PROCESS_ID_UNKNOWN) {
+      higher = static_cast<AudioChannelType>(i);
     }
 
-    else if (!mChannelCounters[AUDIO_CHANNEL_INT_RINGER_HIDDEN].IsEmpty()) {
-      higher = AUDIO_CHANNEL_RINGER;
-    }
-
-    else if (!mChannelCounters[AUDIO_CHANNEL_INT_TELEPHONY_HIDDEN].IsEmpty()) {
-      higher = AUDIO_CHANNEL_TELEPHONY;
-    }
-
-    else if (!mChannelCounters[AUDIO_CHANNEL_INT_ALARM_HIDDEN].IsEmpty()) {
-      higher = AUDIO_CHANNEL_ALARM;
-    }
-
-    else if (!mChannelCounters[AUDIO_CHANNEL_INT_NOTIFICATION_HIDDEN].IsEmpty()) {
-      higher = AUDIO_CHANNEL_NOTIFICATION;
-    }
-
-    // Check whether there is any playable hidden content channel or not.
-    else if (mPlayableHiddenContentChildID != CONTENT_PROCESS_ID_UNKNOWN) {
-      higher = AUDIO_CHANNEL_CONTENT;
+    // Each channel type will be split to fg and bg for recording the state,
+    // so here need to do a translation.
+    if (!mChannelCounters[i * 2 + 1].IsEmpty()) {
+      higher = static_cast<AudioChannelType>(i);
+      break;
     }
   }
 
@@ -513,7 +502,7 @@ AudioChannelService::SendAudioChannelChangedNotification(uint64_t aChildID)
     mCurrentHigherChannel = higher;
 
     nsString channelName;
-    if (mCurrentHigherChannel != AUDIO_CHANNEL_LAST) {
+    if (mCurrentHigherChannel != AUDIO_CHANNEL_DEFAULT) {
       channelName.AssignASCII(ChannelName(mCurrentHigherChannel));
     } else {
       channelName.AssignLiteral("none");
@@ -528,7 +517,7 @@ AudioChannelService::SendAudioChannelChangedNotification(uint64_t aChildID)
     mCurrentVisibleHigherChannel = visibleHigher;
 
     nsString channelName;
-    if (mCurrentVisibleHigherChannel != AUDIO_CHANNEL_LAST) {
+    if (mCurrentVisibleHigherChannel != AUDIO_CHANNEL_DEFAULT) {
       channelName.AssignASCII(ChannelName(mCurrentVisibleHigherChannel));
     } else {
       channelName.AssignLiteral("none");