--- a/dom/html/HTMLMediaElement.h
+++ b/dom/html/HTMLMediaElement.h
@@ -690,19 +690,19 @@ public:
   }
 
   void RemoveTextTrack(TextTrack* aTextTrack, bool aPendingListOnly = false) {
     if (mTextTrackManager) {
       mTextTrackManager->RemoveTextTrack(aTextTrack, aPendingListOnly);
     }
   }
 
-  void AddCue(TextTrackCue& aCue) {
+  void NotifyCueAdded(TextTrackCue& aCue) {
     if (mTextTrackManager) {
-      mTextTrackManager->AddCue(aCue);
+      mTextTrackManager->NotifyCueAdded(aCue);
     }
   }
   void NotifyCueRemoved(TextTrackCue& aCue) {
     if (mTextTrackManager) {
       mTextTrackManager->NotifyCueRemoved(aCue);
     }
   }
 

--- a/dom/html/TextTrackManager.cpp
+++ b/dom/html/TextTrackManager.cpp
@@ -250,17 +250,17 @@ TextTrackManager::UpdateCueDisplay()
       sParserWrapper->ProcessCues(window, jsCues, overlay);
     }
   } else if (overlay->Length() > 0) {
     nsContentUtils::SetNodeTextContent(overlay, EmptyString(), true);
   }
 }
 
 void
-TextTrackManager::AddCue(TextTrackCue& aCue)
+TextTrackManager::NotifyCueAdded(TextTrackCue& aCue)
 {
   if (mNewCues) {
     mNewCues->AddCue(aCue);
   }
   DispatchTimeMarchesOn();
 }
 
 void

--- a/dom/html/TextTrackManager.h
+++ b/dom/html/TextTrackManager.h
@@ -51,17 +51,17 @@ public:
                                            const nsAString& aLanguage,
                                            TextTrackMode aMode,
                                            TextTrackReadyState aReadyState,
                                            TextTrackSource aTextTrackSource);
   void AddTextTrack(TextTrack* aTextTrack);
   void RemoveTextTrack(TextTrack* aTextTrack, bool aPendingListOnly);
   void DidSeek();
 
-  void AddCue(TextTrackCue& aCue);
+  void NotifyCueAdded(TextTrackCue& aCue);
   void AddCues(TextTrack* aTextTrack);
   void NotifyCueRemoved(TextTrackCue& aCue);
   /**
    * Overview of WebVTT cuetext and anonymous content setup.
    *
    * WebVTT nodes are the parsed version of WebVTT cuetext. WebVTT cuetext is
    * the portion of a WebVTT cue that specifies what the caption will actually
    * show up as on screen.

--- a/dom/media/TextTrack.cpp
+++ b/dom/media/TextTrack.cpp
@@ -89,17 +89,35 @@ TextTrack::WrapObject(JSContext* aCx, JS
 
 void
 TextTrack::SetMode(TextTrackMode aValue)
 {
   if (mMode != aValue) {
     mMode = aValue;
     if (aValue == TextTrackMode::Disabled) {
       SetCuesInactive();
-      //TODO: Apply the rules for text track cue rendering Bug 865407
+      // Remove all the cues in MediaElement.
+      if (mTextTrackList) {
+        HTMLMediaElement* mediaElement = mTextTrackList->GetMediaElement();
+        if (mediaElement) {
+          for (size_t i = 0; i < mCueList->Length(); ++i) {
+            mediaElement->NotifyCueRemoved(*(*mCueList)[i]);
+          }
+        }
+      }
+    } else {
+      // Add all the cues into MediaElement.
+      if (mTextTrackList) {
+        HTMLMediaElement* mediaElement = mTextTrackList->GetMediaElement();
+        if (mediaElement) {
+          for (size_t i = 0; i < mCueList->Length(); ++i) {
+            mediaElement->NotifyCueAdded(*(*mCueList)[i]);
+          }
+        }
+      }
     }
     if (mTextTrackList) {
       mTextTrackList->CreateAndDispatchChangeEvent();
     }
   }
 }
 
 void
@@ -114,18 +132,18 @@ TextTrack::GetId(nsAString& aId) const
 
 void
 TextTrack::AddCue(TextTrackCue& aCue)
 {
   mCueList->AddCue(aCue);
   aCue.SetTrack(this);
   if (mTextTrackList) {
     HTMLMediaElement* mediaElement = mTextTrackList->GetMediaElement();
-    if (mediaElement) {
-      mediaElement->AddCue(aCue);
+    if (mediaElement && (mMode != TextTrackMode::Disabled)) {
+      mediaElement->NotifyCueAdded(aCue);
     }
   }
   SetDirty();
 }
 
 void
 TextTrack::RemoveCue(TextTrackCue& aCue, ErrorResult& aRv)
 {