--- a/mobile/android/base/java/org/mozilla/gecko/media/AudioFocusAgent.java
+++ b/mobile/android/base/java/org/mozilla/gecko/media/AudioFocusAgent.java
@@ -51,38 +51,38 @@ public class AudioFocusAgent {
         mContext = context;
         mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
 
         mAfChangeListener = new OnAudioFocusChangeListener() {
             public void onAudioFocusChange(int focusChange) {
                 switch (focusChange) {
                     case AudioManager.AUDIOFOCUS_LOSS:
                         Log.d(LOGTAG, "onAudioFocusChange, AUDIOFOCUS_LOSS");
-                        notifyObservers("AudioFocusChanged", "lostAudioFocus");
+                        notifyObservers("audioFocusChanged", "lostAudioFocus");
                         notifyMediaControlService(MediaControlService.ACTION_PAUSE_BY_AUDIO_FOCUS);
                         mAudioFocusState = LOST_FOCUS;
                         break;
                     case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
                         Log.d(LOGTAG, "onAudioFocusChange, AUDIOFOCUS_LOSS_TRANSIENT");
-                        notifyObservers("AudioFocusChanged", "lostAudioFocusTransiently");
+                        notifyObservers("audioFocusChanged", "lostAudioFocusTransiently");
                         notifyMediaControlService(MediaControlService.ACTION_PAUSE_BY_AUDIO_FOCUS);
                         mAudioFocusState = LOST_FOCUS_TRANSIENT;
                         break;
                     case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
                         Log.d(LOGTAG, "onAudioFocusChange, AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK");
                         notifyMediaControlService(MediaControlService.ACTION_START_AUDIO_DUCK);
                         mAudioFocusState = LOST_FOCUS_TRANSIENT_CAN_DUCK;
                         break;
                     case AudioManager.AUDIOFOCUS_GAIN:
                         if (mAudioFocusState.equals(LOST_FOCUS_TRANSIENT_CAN_DUCK)) {
                             Log.d(LOGTAG, "onAudioFocusChange, AUDIOFOCUS_GAIN (from DUCKING)");
                             notifyMediaControlService(MediaControlService.ACTION_STOP_AUDIO_DUCK);
                         } else if (mAudioFocusState.equals(LOST_FOCUS_TRANSIENT)) {
                             Log.d(LOGTAG, "onAudioFocusChange, AUDIOFOCUS_GAIN");
-                            notifyObservers("AudioFocusChanged", "gainAudioFocus");
+                            notifyObservers("audioFocusChanged", "gainAudioFocus");
                             notifyMediaControlService(MediaControlService.ACTION_RESUME_BY_AUDIO_FOCUS);
                         }
                         mAudioFocusState = OWN_FOCUS;
                         break;
                     default:
                 }
             }
         };

--- a/mobile/android/base/java/org/mozilla/gecko/media/MediaControlService.java
+++ b/mobile/android/base/java/org/mozilla/gecko/media/MediaControlService.java
@@ -307,33 +307,33 @@ public class MediaControlService extends
                 }
             }
 
             @Override
             public void onPlay() {
                 Log.d(LOGTAG, "Controller, onPlay");
                 super.onPlay();
                 setState(State.PLAYING);
-                notifyObservers("MediaControl", "resumeMedia");
+                notifyObservers("mediaControl", "resumeMedia");
             }
 
             @Override
             public void onPause() {
                 Log.d(LOGTAG, "Controller, onPause");
                 super.onPause();
                 setState(State.PAUSED);
-                notifyObservers("MediaControl", "mediaControlPaused");
+                notifyObservers("mediaControl", "mediaControlPaused");
             }
 
             @Override
             public void onStop() {
                 Log.d(LOGTAG, "Controller, onStop");
                 super.onStop();
                 setState(State.STOPPED);
-                notifyObservers("MediaControl", "mediaControlStopped");
+                notifyObservers("mediaControl", "mediaControlStopped");
                 mTabReference = new WeakReference<>(null);
             }
         });
 
     }
 
     private void notifyObservers(String topic, String data) {
         GeckoAppShell.notifyObservers(topic, data);

--- a/mobile/android/chrome/content/browser.js
+++ b/mobile/android/chrome/content/browser.js
@@ -3646,17 +3646,17 @@ Tab.prototype = {
     this.browser.addEventListener("TabPreZombify", this, true);
     this.browser.addEventListener("DOMWindowFocus", this, true);
 
     // Note that the XBL binding is untrusted
     this.browser.addEventListener("PluginBindingAttached", this, true, true);
     this.browser.addEventListener("VideoBindingAttached", this, true, true);
     this.browser.addEventListener("VideoBindingCast", this, true, true);
 
-    Services.obs.addObserver(this, "AudioFocusChanged", false);
+    Services.obs.addObserver(this, "audioFocusChanged", false);
     Services.obs.addObserver(this, "before-first-paint");
     Services.obs.addObserver(this, "media-playback");
 
     // Always initialise new tabs with basic session store data to avoid
     // problems with functions that always expect it to be present
     this.browser.__SS_data = {
       entries: [{
         url: aURL,
@@ -3761,17 +3761,17 @@ Tab.prototype = {
     this.browser.removeEventListener("MozApplicationManifest", this, true);
     this.browser.removeEventListener("TabPreZombify", this, true);
     this.browser.removeEventListener("DOMWindowFocus", this, true);
 
     this.browser.removeEventListener("PluginBindingAttached", this, true, true);
     this.browser.removeEventListener("VideoBindingAttached", this, true, true);
     this.browser.removeEventListener("VideoBindingCast", this, true, true);
 
-    Services.obs.removeObserver(this, "AudioFocusChanged");
+    Services.obs.removeObserver(this, "audioFocusChanged");
     Services.obs.removeObserver(this, "before-first-paint");
     Services.obs.removeObserver(this, "media-playback");
 
     // Make sure the previously selected panel remains selected. The selected panel of a deck is
     // not stable when panels are removed.
     let selectedPanel = BrowserApp.deck.selectedPanel;
     BrowserApp.deck.removeChild(this.browser);
     BrowserApp.deck.selectedPanel = selectedPanel;
@@ -4601,20 +4601,20 @@ Tab.prototype = {
 
   UpdateMediaPlaybackRelatedObserver: function(active) {
     // Media control is only used for the tab which has playing media, so we
     // only need to register observer after having the active media. And the
     // "media-playback-resumed" is sent when user resume paused media from
     // page, it notifies us that we should change the icon and content in media
     // control interface.
     if (active) {
-      Services.obs.addObserver(this, "MediaControl", false);
+      Services.obs.addObserver(this, "mediaControl", false);
       Services.obs.addObserver(this, "media-playback-resumed", false);
     } else {
-      Services.obs.removeObserver(this, "MediaControl");
+      Services.obs.removeObserver(this, "mediaControl");
       Services.obs.removeObserver(this, "media-playback-resumed");
     }
   },
 
   ShouldNotifyMediaPlaybackChange: function(activeState) {
     // If the media is active, we would check it's duration, because we don't
     // want to show the media control interface for the short sound which
     // duration is smaller than the threshold. The basic unit is second.
@@ -4685,18 +4685,18 @@ Tab.prototype = {
 
         GlobalEventDispatcher.sendRequest({
           type: "Tab:MediaPlaybackChange",
           tabID: this.id,
           status: status
         });
         break;
 
-      case "AudioFocusChanged":
-      case "MediaControl":
+      case "audioFocusChanged":
+      case "mediaControl":
         let win = this.browser.contentWindow;
         let utils = win.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
         let suspendTypes = Ci.nsISuspendedTypes;
         switch (aData) {
           case "lostAudioFocus":
             utils.mediaSuspend = suspendTypes.SUSPENDED_PAUSE_DISPOSABLE;
             break;
           case "lostAudioFocusTransiently":