diff --git a/content/html/content/src/HTMLMediaElement.cpp b/content/html/content/src/HTMLMediaElement.cpp
index e0cb50e3e45b..0beaa9bfed36 100755
--- a/content/html/content/src/HTMLMediaElement.cpp
+++ b/content/html/content/src/HTMLMediaElement.cpp
@@ -3095,14 +3095,6 @@ void HTMLMediaElement::UpdateReadyStateForData(MediaDecoderOwner::NextFrameStatu
     return;
   }
 
-  // Section 2.4.3.1 of the Media Source Extensions spec requires
-  // changing to HAVE_METADATA when seeking into an unbuffered
-  // range.
-  if (aNextFrame == MediaDecoderOwner::NEXT_FRAME_WAIT_FOR_MSE_DATA) {
-    ChangeReadyState(nsIDOMHTMLMediaElement::HAVE_METADATA);
-    return;
-  }
-
   if (aNextFrame == MediaDecoderOwner::NEXT_FRAME_UNAVAILABLE_SEEKING) {
     ChangeReadyState(nsIDOMHTMLMediaElement::HAVE_METADATA);
     return;
diff --git a/content/media/MediaDecoderOwner.h b/content/media/MediaDecoderOwner.h
index cdbac3a9a1bb..f3187d4dafaa 100644
--- a/content/media/MediaDecoderOwner.h
+++ b/content/media/MediaDecoderOwner.h
@@ -114,9 +114,6 @@ public:
     NEXT_FRAME_UNAVAILABLE_SEEKING,
     // The next frame of audio/video is unavailable for some other reasons
     NEXT_FRAME_UNAVAILABLE,
-    // The next frame is unavailable due to waiting for more Media Source
-    // Extensions data to become available.
-    NEXT_FRAME_WAIT_FOR_MSE_DATA,
     // Sentinel value
     NEXT_FRAME_UNINITIALIZED
   };
diff --git a/content/media/mediasource/MediaSourceReader.cpp b/content/media/mediasource/MediaSourceReader.cpp
index 25ddcb6feccc..afa5ce2f52a1 100644
--- a/content/media/mediasource/MediaSourceReader.cpp
+++ b/content/media/mediasource/MediaSourceReader.cpp
@@ -371,25 +371,6 @@ MediaSourceReader::OnTrackBufferConfigured(TrackBuffer* aTrackBuffer, const Medi
   mDecoder->NotifyWaitingForResourcesStatusChanged();
 }
 
-class ChangeToHaveMetadata : public nsRunnable {
-public:
-  explicit ChangeToHaveMetadata(AbstractMediaDecoder* aDecoder) :
-    mDecoder(aDecoder)
-  {
-  }
-
-  NS_IMETHOD Run() MOZ_OVERRIDE MOZ_FINAL {
-    auto owner = mDecoder->GetOwner();
-    if (owner) {
-      owner->UpdateReadyStateForData(MediaDecoderOwner::NEXT_FRAME_WAIT_FOR_MSE_DATA);
-    }
-    return NS_OK;
-  }
-
-private:
-  nsRefPtr<AbstractMediaDecoder> mDecoder;
-};
-
 void
 MediaSourceReader::WaitForTimeRange(int64_t aTime)
 {
@@ -434,11 +415,6 @@ MediaSourceReader::Seek(int64_t aTime, int64_t aStartTime, int64_t aEndTime,
   mLastAudioTime = aTime;
   mLastVideoTime = aTime;
 
-  if (!TrackBuffersContainTime(aTime)) {
-    MSE_DEBUG("MediaSourceReader(%p)::Seek no active buffer contains target=%lld", this, aTime);
-    NS_DispatchToMainThread(new ChangeToHaveMetadata(mDecoder));
-  }
-
   WaitForTimeRange(aTime);
 
   if (IsShutdown()) {
diff --git a/content/media/mediasource/test/mochitest.ini b/content/media/mediasource/test/mochitest.ini
index 7701e71e4bbd..8ca2c7bfaf8e 100644
--- a/content/media/mediasource/test/mochitest.ini
+++ b/content/media/mediasource/test/mochitest.ini
@@ -5,10 +5,11 @@ support-files =
   seek.webm seek.webm^headers^
   seek_lowres.webm seek_lowres.webm^headers^
 
-[test_BufferedSeek.html]
-[test_FrameSelection.html]
 [test_MediaSource.html]
 [test_MediaSource_disabled.html]
+[test_BufferedSeek.html]
+[test_FrameSelection.html]
+[test_HaveMetadataUnbufferedSeek.html]
 [test_SeekableAfterEndOfStream.html]
 [test_SeekableAfterEndOfStreamSplit.html]
 [test_SeekableBeforeEndOfStream.html]
diff --git a/content/media/mediasource/test/test_HaveMetadataUnbufferedSeek.html b/content/media/mediasource/test/test_HaveMetadataUnbufferedSeek.html
new file mode 100644
index 000000000000..6f569fc84262
--- /dev/null
+++ b/content/media/mediasource/test/test_HaveMetadataUnbufferedSeek.html
@@ -0,0 +1,48 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>MSE: seekable attribute before end of stream</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="mediasource.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+runWithMSE(function (ms, v) {
+  ms.addEventListener("sourceopen", function () {
+    var sb = ms.addSourceBuffer("video/webm");
+
+    fetchWithXHR("seek.webm", function (arrayBuffer) {
+      sb.appendBuffer(new Uint8Array(arrayBuffer, 0, 67833));
+    });
+
+    var target = 2;
+
+    v.addEventListener("canplay", function oncanplay() {
+      v.removeEventListener("canplay", oncanplay);
+      ok(v.readyState >= v.HAVE_FUTURE_DATA, "readyState is >= FUTURE_DATA");
+      v.currentTime = target;
+    });
+
+    v.addEventListener("seeking", function () {
+      is(v.readyState, v.HAVE_METADATA, "readyState is HAVE_METADATA");
+      fetchWithXHR("seek.webm", function (arrayBuffer) {
+        sb.appendBuffer(new Uint8Array(arrayBuffer, 67833));
+      });
+    });
+
+    v.addEventListener("seeked", function () {
+      ok(v.readyState >= v.HAVE_FUTURE_DATA, "readyState is >= FUTURE_DATA");
+      SimpleTest.finish();
+    });
+  });
+});
+
+</script>
+</pre>
+</body>
+</html>
