diff --git a/dom/media/BaseMediaResource.h b/dom/media/BaseMediaResource.h
index 78f93ea0607f..ed635356ed42 100644
--- a/dom/media/BaseMediaResource.h
+++ b/dom/media/BaseMediaResource.h
@@ -64,7 +64,7 @@ public:
   // Resume any downloads that have been suspended.
   virtual void Resume() = 0;
 
-  // The mode is initially MODE_PLAYBACK.
+  // The mode is initially MODE_METADATA.
   virtual void SetReadMode(MediaCacheStream::ReadMode aMode) = 0;
 
   // Returns true if the resource can be seeked to unbuffered ranges, i.e.
diff --git a/dom/media/ChannelMediaDecoder.cpp b/dom/media/ChannelMediaDecoder.cpp
index ca61203875ac..344252c4e09c 100644
--- a/dom/media/ChannelMediaDecoder.cpp
+++ b/dom/media/ChannelMediaDecoder.cpp
@@ -255,9 +255,6 @@ ChannelMediaDecoder::Load(nsIChannel* aChannel,
   rv = mResource->Open(aStreamListener);
   NS_ENSURE_SUCCESS(rv, rv);
 
-  // Set mode to METADATA since we are about to read metadata.
-  mResource->SetReadMode(MediaCacheStream::MODE_METADATA);
-
   SetStateMachine(CreateStateMachine());
   NS_ENSURE_TRUE(GetStateMachine(), NS_ERROR_FAILURE);
 
diff --git a/dom/media/MediaCache.cpp b/dom/media/MediaCache.cpp
index 53ed6f2a949f..a397fc3d72b6 100644
--- a/dom/media/MediaCache.cpp
+++ b/dom/media/MediaCache.cpp
@@ -507,7 +507,6 @@ MediaCacheStream::MediaCacheStream(ChannelMediaResource* aClient,
   , mStreamOffset(0)
   , mPlaybackBytesPerSecond(10000)
   , mPinCount(0)
-  , mCurrentMode(MODE_PLAYBACK)
   , mMetadataInPartialBlockBuffer(false)
   , mIsPrivateBrowsing(aIsPrivateBrowsing)
 {
diff --git a/dom/media/MediaCache.h b/dom/media/MediaCache.h
index 85f33eeb51d8..7622a548023c 100644
--- a/dom/media/MediaCache.h
+++ b/dom/media/MediaCache.h
@@ -523,7 +523,7 @@ private:
   // when mDidNotifyDataEnded is true.
   nsresult          mNotifyDataEndedStatus;
   // The last reported read mode
-  ReadMode          mCurrentMode;
+  ReadMode mCurrentMode = MODE_METADATA;
   // True if some data in mPartialBlockBuffer has been read as metadata
   bool              mMetadataInPartialBlockBuffer;
   // The load ID of the current channel. Used to check whether the data is