--- a/dom/html/HTMLMediaElement.cpp
+++ b/dom/html/HTMLMediaElement.cpp
@@ -4708,16 +4708,18 @@ nsresult HTMLMediaElement::FinishDecoder
   mDecoder->SetVolume(mMuted ? 0.0 : mVolume);
   mDecoder->SetPreservesPitch(mPreservesPitch);
   mDecoder->SetPlaybackRate(mPlaybackRate);
   if (mPreloadAction == HTMLMediaElement::PRELOAD_METADATA) {
     mDecoder->SetMinimizePrerollUntilPlaybackStarts();
   }
   // Notify the decoder of suspend taint.
   mDecoder->SetSuspendTaint(mHasSuspendTaint);
+  // Notify the decoder of the initial activity status.
+  NotifyDecoderActivityChanges();
 
   // Update decoder principal before we start decoding, since it
   // can affect how we feed data to MediaStreams
   NotifyDecoderPrincipalChanged();
 
   nsresult rv = aDecoder->Load(aListener);
   if (NS_FAILED(rv)) {
     ShutdownDecoder();

--- a/dom/media/MediaDecoder.cpp
+++ b/dom/media/MediaDecoder.cpp
@@ -390,18 +390,18 @@ MediaDecoder::MediaDecoder(MediaDecoderO
   , mAbstractMainThread(aOwner->AbstractMainThread())
   , mFrameStats(new FrameStatistics())
   , mVideoFrameContainer(aOwner->GetVideoFrameContainer())
   , mPlaybackStatistics(new MediaChannelStatistics())
   , mPinnedForSeek(false)
   , mMinimizePreroll(false)
   , mMediaTracksConstructed(false)
   , mFiredMetadataLoaded(false)
-  , mIsDocumentVisible(!aOwner->IsHidden())
-  , mIsElementVisible(!aOwner->IsHidden())
+  , mIsDocumentVisible(false)
+  , mIsElementVisible(false)
   , mForcedHidden(false)
   , mHasSuspendTaint(false)
   , INIT_MIRROR(mStateMachineIsShutdown, true)
   , INIT_MIRROR(mBuffered, TimeIntervals())
   , INIT_MIRROR(mNextFrameStatus, MediaDecoderOwner::NEXT_FRAME_UNAVAILABLE)
   , INIT_MIRROR(mCurrentPosition, 0)
   , INIT_MIRROR(mStateMachineDuration, NullableTimeUnit())
   , INIT_MIRROR(mPlaybackPosition, 0)