--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -5762,16 +5762,23 @@ HTMLMediaElement::UpdateReadyStateIntern
     // We haven't yet loaded the first frame, making us unable to determine
     // if we have enough valid data at the present stage.
     return;
   }
 
   if (nextFrameStatus == NEXT_FRAME_UNAVAILABLE_BUFFERING) {
     // Force HAVE_CURRENT_DATA when buffering.
     ChangeReadyState(nsIDOMHTMLMediaElement::HAVE_CURRENT_DATA);
+    if (mDecoder) {
+      // The side effect of CanPlayThrough() will update mCanPlayThrough of
+      // MDSM so it has a chance to exit buffering quickly.
+      // TODO: This implicit coupling is bad. Refactoring should be done
+      // to remove the side effect of CanPlayThrough().
+      mDecoder->CanPlayThrough();
+    }
     return;
   }
 
   // TextTracks must be loaded for the HAVE_ENOUGH_DATA and
   // HAVE_FUTURE_DATA.
   // So force HAVE_CURRENT_DATA if text tracks not loaded.
   if (mTextTrackManager && !mTextTrackManager->IsLoaded()) {
     ChangeReadyState(nsIDOMHTMLMediaElement::HAVE_CURRENT_DATA);