diff --git a/dom/media/Benchmark.cpp b/dom/media/Benchmark.cpp
index d24e1e5c9ebe..5d87c5940719 100644
--- a/dom/media/Benchmark.cpp
+++ b/dom/media/Benchmark.cpp
@@ -335,7 +335,7 @@ BenchmarkPlayback::GlobalShutdown()
 }
 
 void
-BenchmarkPlayback::Output(MediaDataDecoder::DecodedData&& aResults)
+BenchmarkPlayback::Output(const MediaDataDecoder::DecodedData& aResults)
 {
   MOZ_ASSERT(OnThread());
   MOZ_ASSERT(!mFinished);
@@ -391,14 +391,14 @@ BenchmarkPlayback::InputExhausted()
   if (mSampleIndex == mSamples.Length() && !ref->mParameters.mStopAtFrame) {
     // Complete current frame decode then drain if still necessary.
     p->Then(Thread(), __func__,
-            [ref, this](MediaDataDecoder::DecodedData&& aResults) {
-              Output(std::move(aResults));
+            [ref, this](const MediaDataDecoder::DecodedData& aResults) {
+              Output(aResults);
               if (!mFinished) {
                 mDecoder->Drain()->Then(
                   Thread(), __func__,
-                  [ref, this](MediaDataDecoder::DecodedData&& aResults) {
+                  [ref, this](const MediaDataDecoder::DecodedData& aResults) {
                     mDrained = true;
-                    Output(std::move(aResults));
+                    Output(aResults);
                     MOZ_ASSERT(mFinished, "We must be done now");
                   },
                   [ref, this](const MediaResult& aError) { Error(aError); });
@@ -411,8 +411,8 @@ BenchmarkPlayback::InputExhausted()
     }
     // Continue decoding
     p->Then(Thread(), __func__,
-            [ref, this](MediaDataDecoder::DecodedData&& aResults) {
-              Output(std::move(aResults));
+            [ref, this](const MediaDataDecoder::DecodedData& aResults) {
+              Output(aResults);
               if (!mFinished) {
                 InputExhausted();
               }
diff --git a/dom/media/Benchmark.h b/dom/media/Benchmark.h
index 140191d36e88..f6a5ff53b6a5 100644
--- a/dom/media/Benchmark.h
+++ b/dom/media/Benchmark.h
@@ -29,7 +29,7 @@ class BenchmarkPlayback : public QueueObject
   void GlobalShutdown();
   void InitDecoder(TrackInfo&& aInfo);
 
-  void Output(MediaDataDecoder::DecodedData&& aResults);
+  void Output(const MediaDataDecoder::DecodedData& aResults);
   void Error(const MediaResult& aError);
   void InputExhausted();
 
diff --git a/dom/media/MediaFormatReader.cpp b/dom/media/MediaFormatReader.cpp
index 857c56b78071..9ba33603ec50 100644
--- a/dom/media/MediaFormatReader.cpp
+++ b/dom/media/MediaFormatReader.cpp
@@ -1845,7 +1845,7 @@ MediaFormatReader::OnAudioDemuxCompleted(
 
 void
 MediaFormatReader::NotifyNewOutput(
-  TrackType aTrack, MediaDataDecoder::DecodedData&& aResults)
+  TrackType aTrack, const MediaDataDecoder::DecodedData& aResults)
 {
   MOZ_ASSERT(OnTaskQueue());
   auto& decoder = GetDecoderData(aTrack);
@@ -1854,7 +1854,7 @@ MediaFormatReader::NotifyNewOutput(
           aTrack == TrackInfo::kAudioTrack ? "decoded_audio" : "decoded_video",
           "no output samples");
   } else
-    for (auto&& sample : aResults) {
+    for (auto& sample : aResults) {
       if (DecoderDoctorLogger::IsDDLoggingEnabled()) {
         switch (sample->mType) {
           case MediaData::AUDIO_DATA:
@@ -2180,9 +2180,9 @@ MediaFormatReader::DecodeDemuxedSamples(TrackType aTrack,
   decoder.mDecoder->Decode(aSample)
     ->Then(mTaskQueue, __func__,
            [self, aTrack, &decoder]
-           (MediaDataDecoder::DecodedData&& aResults) {
+           (const MediaDataDecoder::DecodedData& aResults) {
              decoder.mDecodeRequest.Complete();
-             self->NotifyNewOutput(aTrack, std::move(aResults));
+             self->NotifyNewOutput(aTrack, aResults);
 
              // When we recovered from a GPU crash and get the first decoded
              // frame, report the recovery time telemetry.
@@ -2395,13 +2395,13 @@ MediaFormatReader::DrainDecoder(TrackType aTrack)
   decoder.mDecoder->Drain()
     ->Then(mTaskQueue, __func__,
            [self, aTrack, &decoder]
-           (MediaDataDecoder::DecodedData&& aResults) {
+           (const MediaDataDecoder::DecodedData& aResults) {
              decoder.mDrainRequest.Complete();
              DDLOGEX(self.get(), DDLogCategory::Log, "drained", DDNoValue{});
              if (aResults.IsEmpty()) {
                decoder.mDrainState = DrainState::DrainCompleted;
              } else {
-               self->NotifyNewOutput(aTrack, std::move(aResults));
+               self->NotifyNewOutput(aTrack, aResults);
                // Let's see if we have any more data available to drain.
                decoder.mDrainState = DrainState::PartialDrainPending;
              }
diff --git a/dom/media/MediaFormatReader.h b/dom/media/MediaFormatReader.h
index a7f94fa97c4a..abb841b9e5e7 100644
--- a/dom/media/MediaFormatReader.h
+++ b/dom/media/MediaFormatReader.h
@@ -318,7 +318,7 @@ private:
   // Drain the current decoder.
   void DrainDecoder(TrackType aTrack);
   void NotifyNewOutput(TrackType aTrack,
-                       MediaDataDecoder::DecodedData&& aResults);
+                       const MediaDataDecoder::DecodedData& aResults);
   void NotifyError(TrackType aTrack, const MediaResult& aError);
   void NotifyWaitingForData(TrackType aTrack);
   void NotifyWaitingForKey(TrackType aTrack);
diff --git a/dom/media/ipc/RemoteVideoDecoderChild.cpp b/dom/media/ipc/RemoteVideoDecoderChild.cpp
index 2e49513324e3..de9cdb24981a 100644
--- a/dom/media/ipc/RemoteVideoDecoderChild.cpp
+++ b/dom/media/ipc/RemoteVideoDecoderChild.cpp
@@ -119,8 +119,8 @@ mozilla::ipc::IPCResult
 RemoteVideoDecoderChild::RecvInputExhausted()
 {
   AssertOnManagerThread();
-  mDecodePromise.ResolveIfExists(std::move(mDecodedData), __func__);
-  mDecodedData = MediaDataDecoder::DecodedData();
+  mDecodePromise.ResolveIfExists(mDecodedData, __func__);
+  mDecodedData.Clear();
   return IPC_OK();
 }
 
@@ -128,8 +128,8 @@ mozilla::ipc::IPCResult
 RemoteVideoDecoderChild::RecvDrainComplete()
 {
   AssertOnManagerThread();
-  mDecodePromise.ResolveIfExists(std::move(mDecodedData), __func__);
-  mDecodedData = MediaDataDecoder::DecodedData();
+  mDrainPromise.ResolveIfExists(mDecodedData, __func__);
+  mDecodedData.Clear();
   return IPC_OK();
 }
 
@@ -137,7 +137,7 @@ mozilla::ipc::IPCResult
 RemoteVideoDecoderChild::RecvError(const nsresult& aError)
 {
   AssertOnManagerThread();
-  mDecodedData = MediaDataDecoder::DecodedData();
+  mDecodedData.Clear();
   mDecodePromise.RejectIfExists(aError, __func__);
   mDrainPromise.RejectIfExists(aError, __func__);
   mFlushPromise.RejectIfExists(aError, __func__);
diff --git a/dom/media/ipc/VideoDecoderChild.cpp b/dom/media/ipc/VideoDecoderChild.cpp
index ec35672b26a2..8cd2e258a3d3 100644
--- a/dom/media/ipc/VideoDecoderChild.cpp
+++ b/dom/media/ipc/VideoDecoderChild.cpp
@@ -81,8 +81,8 @@ mozilla::ipc::IPCResult
 VideoDecoderChild::RecvInputExhausted()
 {
   AssertOnManagerThread();
-  mDecodePromise.ResolveIfExists(std::move(mDecodedData), __func__);
-  mDecodedData = MediaDataDecoder::DecodedData();
+  mDecodePromise.ResolveIfExists(mDecodedData, __func__);
+  mDecodedData.Clear();
   return IPC_OK();
 }
 
@@ -90,8 +90,8 @@ mozilla::ipc::IPCResult
 VideoDecoderChild::RecvDrainComplete()
 {
   AssertOnManagerThread();
-  mDrainPromise.ResolveIfExists(std::move(mDecodedData), __func__);
-  mDecodedData = MediaDataDecoder::DecodedData();
+  mDrainPromise.ResolveIfExists(mDecodedData, __func__);
+  mDecodedData.Clear();
   return IPC_OK();
 }
 
@@ -99,7 +99,7 @@ mozilla::ipc::IPCResult
 VideoDecoderChild::RecvError(const nsresult& aError)
 {
   AssertOnManagerThread();
-  mDecodedData = MediaDataDecoder::DecodedData();
+  mDecodedData.Clear();
   mDecodePromise.RejectIfExists(aError, __func__);
   mDrainPromise.RejectIfExists(aError, __func__);
   mFlushPromise.RejectIfExists(aError, __func__);
@@ -153,7 +153,7 @@ VideoDecoderChild::ActorDestroy(ActorDestroyReason aWhy)
         MediaResult error(NS_ERROR_DOM_MEDIA_NEED_NEW_DECODER);
         error.SetGPUCrashTimeStamp(ref->mGPUCrashTime);
         if (ref->mInitialized) {
-          mDecodedData = MediaDataDecoder::DecodedData();
+          mDecodedData.Clear();
           mDecodePromise.RejectIfExists(error, __func__);
           mDrainPromise.RejectIfExists(error, __func__);
           mFlushPromise.RejectIfExists(error, __func__);
diff --git a/dom/media/ipc/VideoDecoderParent.cpp b/dom/media/ipc/VideoDecoderParent.cpp
index cf2d7006db8f..037af7cc2703 100644
--- a/dom/media/ipc/VideoDecoderParent.cpp
+++ b/dom/media/ipc/VideoDecoderParent.cpp
@@ -165,11 +165,11 @@ VideoDecoderParent::RecvInput(const MediaRawDataIPDL& aData)
   RefPtr<VideoDecoderParent> self = this;
   mDecoder->Decode(data)->Then(
     mManagerTaskQueue, __func__,
-    [self, this](MediaDataDecoder::DecodedData&& aResults) {
+    [self, this](const MediaDataDecoder::DecodedData& aResults) {
       if (mDestroyed) {
         return;
       }
-      ProcessDecodedData(std::move(aResults));
+      ProcessDecodedData(aResults);
       Unused << SendInputExhausted();
     },
     [self](const MediaResult& aError) { self->Error(aError); });
@@ -177,7 +177,8 @@ VideoDecoderParent::RecvInput(const MediaRawDataIPDL& aData)
 }
 
 void
-VideoDecoderParent::ProcessDecodedData(MediaDataDecoder::DecodedData&& aData)
+VideoDecoderParent::ProcessDecodedData(
+  const MediaDataDecoder::DecodedData& aData)
 {
   MOZ_ASSERT(OnManagerThread());
 
@@ -186,7 +187,7 @@ VideoDecoderParent::ProcessDecodedData(MediaDataDecoder::DecodedData&& aData)
     return;
   }
 
-  for (auto&& data : aData) {
+  for (const auto& data : aData) {
     MOZ_ASSERT(data->mType == MediaData::VIDEO_DATA,
                 "Can only decode videos using VideoDecoderParent!");
     VideoData* video = static_cast<VideoData*>(data.get());
@@ -199,7 +200,7 @@ VideoDecoderParent::ProcessDecodedData(MediaDataDecoder::DecodedData&& aData)
 
     if (!texture) {
       texture = ImageClient::CreateTextureClientForImage(video->mImage,
-                                                         mKnowsCompositor);
+                                                          mKnowsCompositor);
     }
 
     if (texture && !texture->IsAddedToCompositableClient()) {
@@ -247,9 +248,9 @@ VideoDecoderParent::RecvDrain()
   RefPtr<VideoDecoderParent> self = this;
   mDecoder->Drain()->Then(
     mManagerTaskQueue, __func__,
-    [self, this](MediaDataDecoder::DecodedData&& aResults) {
+    [self, this](const MediaDataDecoder::DecodedData& aResults) {
       if (!mDestroyed) {
-        ProcessDecodedData(std::move(aResults));
+        ProcessDecodedData(aResults);
         Unused << SendDrainComplete();
       }
     },
diff --git a/dom/media/ipc/VideoDecoderParent.h b/dom/media/ipc/VideoDecoderParent.h
index bfa9d0dd2c24..c8857a07091f 100644
--- a/dom/media/ipc/VideoDecoderParent.h
+++ b/dom/media/ipc/VideoDecoderParent.h
@@ -53,7 +53,7 @@ private:
   void Error(const MediaResult& aError);
 
   ~VideoDecoderParent();
-  void ProcessDecodedData(MediaDataDecoder::DecodedData&& aData);
+  void ProcessDecodedData(const MediaDataDecoder::DecodedData& aData);
 
   RefPtr<VideoDecoderManagerParent> mParent;
   RefPtr<VideoDecoderParent> mIPDLSelfRef;
diff --git a/dom/media/mediacapabilities/MediaCapabilities.cpp b/dom/media/mediacapabilities/MediaCapabilities.cpp
index 0edbfbd013f3..9f47ea2f4dd9 100644
--- a/dom/media/mediacapabilities/MediaCapabilities.cpp
+++ b/dom/media/mediacapabilities/MediaCapabilities.cpp
@@ -251,10 +251,8 @@ MediaCapabilities::DecodingInfo(
     promises.AppendElement(InvokeAsync(
       taskQueue,
       __func__,
-      [ taskQueue,
-        frameRate,
-        compositor,
-        config = std::move(config) ]() mutable -> RefPtr<CapabilitiesPromise> {
+      [taskQueue, frameRate, compositor, config = std::move(config)]() mutable
+      -> RefPtr<CapabilitiesPromise> {
         // MediaDataDecoder keeps a reference to the config object, so we must
         // keep it alive until the decoder has been shutdown.
         CreateDecoderParams params{ *config,
@@ -266,25 +264,25 @@ MediaCapabilities::DecodingInfo(
         return AllocationWrapper::CreateDecoder(params)->Then(
           taskQueue,
           __func__,
-          [ taskQueue, frameRate, config = std::move(config) ](
-            AllocationWrapper::AllocateDecoderPromise::ResolveOrRejectValue&&
-            aValue) mutable {
+          [taskQueue, frameRate, config = std::move(config)](
+            const AllocationWrapper::AllocateDecoderPromise::
+              ResolveOrRejectValue& aValue) mutable {
             if (aValue.IsReject()) {
-              return CapabilitiesPromise::CreateAndReject(
-                std::move(aValue.RejectValue()), __func__);
+              return CapabilitiesPromise::CreateAndReject(aValue.RejectValue(),
+                                                          __func__);
             }
-            RefPtr<MediaDataDecoder> decoder = std::move(aValue.ResolveValue());
+            RefPtr<MediaDataDecoder> decoder = aValue.ResolveValue();
             // We now query the decoder to determine if it's power efficient.
             RefPtr<CapabilitiesPromise> p = decoder->Init()->Then(
               taskQueue,
               __func__,
-              [ taskQueue, decoder, frameRate, config = std::move(config) ](
-                MediaDataDecoder::InitPromise::ResolveOrRejectValue&&
-                aValue) mutable {
+              [taskQueue, decoder, frameRate, config = std::move(config)](
+                const MediaDataDecoder::InitPromise::ResolveOrRejectValue&
+                  aValue) mutable {
                 RefPtr<CapabilitiesPromise> p;
                 if (aValue.IsReject()) {
-                  p = CapabilitiesPromise::CreateAndReject(
-                    std::move(aValue.RejectValue()), __func__);
+                  p = CapabilitiesPromise::CreateAndReject(aValue.RejectValue(),
+                                                           __func__);
                 } else {
                   MOZ_ASSERT(config->IsVideo());
                   nsAutoCString reason;
@@ -370,15 +368,14 @@ MediaCapabilities::DecodingInfo(
     ->Then(
       targetThread,
       __func__,
-      [
-        promise,
-        tracks = std::move(tracks),
-        workerRef,
-        holder,
-        aConfiguration,
-        self,
-        this
-      ](CapabilitiesPromise::AllPromiseType::ResolveOrRejectValue&& aValue) {
+      [promise,
+       tracks = std::move(tracks),
+       workerRef,
+       holder,
+       aConfiguration,
+       self,
+       this](const CapabilitiesPromise::AllPromiseType::ResolveOrRejectValue&
+               aValue) {
         holder->Complete();
         if (aValue.IsReject()) {
           auto info =
diff --git a/dom/media/platforms/agnostic/eme/EMEDecoderModule.cpp b/dom/media/platforms/agnostic/eme/EMEDecoderModule.cpp
index d4195c646260..532f92d6a969 100644
--- a/dom/media/platforms/agnostic/eme/EMEDecoderModule.cpp
+++ b/dom/media/platforms/agnostic/eme/EMEDecoderModule.cpp
@@ -214,12 +214,14 @@ public:
       writer->mCrypto = CryptoSample();
       RefPtr<EMEDecryptor> self = this;
       mDecoder->Decode(aDecrypted.mSample)
-        ->Then(mTaskQueue,
-               __func__,
-               [self](DecodePromise::ResolveOrRejectValue&& aValue) {
+        ->Then(mTaskQueue, __func__,
+               [self](const DecodedData& aResults) {
                  self->mDecodeRequest.Complete();
-                 self->mDecodePromise.ResolveOrReject(std::move(aValue),
-                                                      __func__);
+                 self->mDecodePromise.ResolveIfExists(aResults, __func__);
+               },
+               [self](const MediaResult& aError) {
+                 self->mDecodeRequest.Complete();
+                 self->mDecodePromise.RejectIfExists(aError, __func__);
                })
         ->Track(mDecodeRequest);
     }
@@ -348,14 +350,16 @@ EMEMediaDataDecoderProxy::Decode(MediaRawData* aSample)
                mKeyRequest.Complete();
 
                MediaDataDecoderProxy::Decode(aSample)
-                 ->Then(
-                   mTaskQueue,
-                   __func__,
-                   [self, this](DecodePromise::ResolveOrRejectValue&& aValue) {
-                     mDecodeRequest.Complete();
-                     mDecodePromise.ResolveOrReject(std::move(aValue),
-                                                    __func__);
-                   })
+                 ->Then(mTaskQueue,
+                        __func__,
+                        [self, this](const DecodedData& aResults) {
+                          mDecodeRequest.Complete();
+                          mDecodePromise.Resolve(aResults, __func__);
+                        },
+                        [self, this](const MediaResult& aError) {
+                          mDecodeRequest.Complete();
+                          mDecodePromise.Reject(aError, __func__);
+                        })
                  ->Track(mDecodeRequest);
              },
              [self]() {
diff --git a/dom/media/platforms/agnostic/gmp/GMPVideoDecoder.cpp b/dom/media/platforms/agnostic/gmp/GMPVideoDecoder.cpp
index 99d21d7a9093..75745b14f47f 100644
--- a/dom/media/platforms/agnostic/gmp/GMPVideoDecoder.cpp
+++ b/dom/media/platforms/agnostic/gmp/GMPVideoDecoder.cpp
@@ -101,16 +101,16 @@ void
 GMPVideoDecoder::InputDataExhausted()
 {
   MOZ_ASSERT(IsOnGMPThread());
-  mDecodePromise.ResolveIfExists(std::move(mDecodedData), __func__);
-  mDecodedData = DecodedData();
+  mDecodePromise.ResolveIfExists(mDecodedData, __func__);
+  mDecodedData.Clear();
 }
 
 void
 GMPVideoDecoder::DrainComplete()
 {
   MOZ_ASSERT(IsOnGMPThread());
-  mDrainPromise.ResolveIfExists(std::move(mDecodedData), __func__);
-  mDecodedData = DecodedData();
+  mDrainPromise.ResolveIfExists(mDecodedData, __func__);
+  mDecodedData.Clear();
 }
 
 void
diff --git a/dom/media/platforms/android/RemoteDataDecoder.cpp b/dom/media/platforms/android/RemoteDataDecoder.cpp
index 70fa16a0564f..c938d39984f8 100644
--- a/dom/media/platforms/android/RemoteDataDecoder.cpp
+++ b/dom/media/platforms/android/RemoteDataDecoder.cpp
@@ -498,7 +498,7 @@ RemoteDataDecoder::Flush()
 {
   RefPtr<RemoteDataDecoder> self = this;
   return InvokeAsync(mTaskQueue, __func__, [self, this]() {
-    mDecodedData = DecodedData();
+    mDecodedData.Clear();
     mNumPendingInputs = 0;
     mDecodePromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
     mDrainPromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
@@ -726,12 +726,12 @@ RemoteDataDecoder::ReturnDecodedData()
 
   // We only want to clear mDecodedData when we have resolved the promises.
   if (!mDecodePromise.IsEmpty()) {
-    mDecodePromise.Resolve(std::move(mDecodedData), __func__);
-    mDecodedData = DecodedData();
+    mDecodePromise.Resolve(mDecodedData, __func__);
+    mDecodedData.Clear();
   } else if (!mDrainPromise.IsEmpty() &&
              (!mDecodedData.IsEmpty() || mDrainStatus == DrainStatus::DRAINED)) {
-    mDrainPromise.Resolve(std::move(mDecodedData), __func__);
-    mDecodedData = DecodedData();
+    mDrainPromise.Resolve(mDecodedData, __func__);
+    mDecodedData.Clear();
   }
 }
 
diff --git a/dom/media/platforms/apple/AppleATDecoder.cpp b/dom/media/platforms/apple/AppleATDecoder.cpp
index 4f4c119a00de..85c7e6eca088 100644
--- a/dom/media/platforms/apple/AppleATDecoder.cpp
+++ b/dom/media/platforms/apple/AppleATDecoder.cpp
@@ -223,9 +223,7 @@ AppleATDecoder::ProcessDecode(MediaRawData* aSample)
     mQueuedSamples.Clear();
   }
 
-  DecodedData results = std::move(mDecodedSamples);
-  mDecodedSamples = DecodedData();
-  return DecodePromise::CreateAndResolve(std::move(results), __func__);
+  return DecodePromise::CreateAndResolve(std::move(mDecodedSamples), __func__);
 }
 
 MediaResult
diff --git a/dom/media/platforms/omx/OmxDataDecoder.cpp b/dom/media/platforms/omx/OmxDataDecoder.cpp
index eb087e61d2fe..b8236da77a19 100644
--- a/dom/media/platforms/omx/OmxDataDecoder.cpp
+++ b/dom/media/platforms/omx/OmxDataDecoder.cpp
@@ -137,12 +137,15 @@ OmxDataDecoder::EndOfStream()
 
   RefPtr<OmxDataDecoder> self = this;
   mOmxLayer->SendCommand(OMX_CommandFlush, OMX_ALL, nullptr)
-    ->Then(mOmxTaskQueue,
-           __func__,
-           [self, this](OmxCommandPromise::ResolveOrRejectValue&& aValue) {
-             mDrainPromise.ResolveIfExists(std::move(mDecodedData), __func__);
-             mDecodedData = DecodedData();
-           });
+    ->Then(mOmxTaskQueue, __func__,
+        [self, this] () {
+          mDrainPromise.ResolveIfExists(mDecodedData, __func__);
+            mDecodedData.Clear();
+        },
+        [self, this] () {
+          mDrainPromise.ResolveIfExists(mDecodedData, __func__);
+          mDecodedData.Clear();
+        });
 }
 
 RefPtr<MediaDataDecoder::InitPromise>
@@ -398,8 +401,8 @@ OmxDataDecoder::EmptyBufferDone(BufferData* aData)
           return;
         }
 
-        mDecodePromise.ResolveIfExists(std::move(mDecodedData), __func__);
-        mDecodedData = DecodedData();
+        mDecodePromise.ResolveIfExists(mDecodedData, __func__);
+        mDecodedData.Clear();
       });
 
     nsresult rv = mOmxTaskQueue->Dispatch(r.forget());
@@ -419,7 +422,7 @@ OmxDataDecoder::NotifyError(OMX_ERRORTYPE aOmxError, const char* aLine, const Me
 {
   LOG("NotifyError %d (%s) at %s", static_cast<int>(aOmxError),
       aError.ErrorName().get(), aLine);
-  mDecodedData = DecodedData();
+  mDecodedData.Clear();
   mDecodePromise.RejectIfExists(aError, __func__);
   mDrainPromise.RejectIfExists(aError, __func__);
   mFlushPromise.RejectIfExists(aError, __func__);
@@ -852,7 +855,7 @@ OmxDataDecoder::DoFlush()
 {
   MOZ_ASSERT(mOmxTaskQueue->IsCurrentThreadIn());
 
-  mDecodedData = DecodedData();
+  mDecodedData.Clear();
   mDecodePromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
   mDrainPromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
 
diff --git a/dom/media/platforms/wrappers/MediaChangeMonitor.cpp b/dom/media/platforms/wrappers/MediaChangeMonitor.cpp
index 0d8aac76a089..b665679f70da 100644
--- a/dom/media/platforms/wrappers/MediaChangeMonitor.cpp
+++ b/dom/media/platforms/wrappers/MediaChangeMonitor.cpp
@@ -552,8 +552,8 @@ MediaChangeMonitor::DecodeFirstSample(MediaRawData* aSample)
   AssertOnTaskQueue();
 
   if (mNeedKeyframe && !aSample->mKeyframe) {
-    mDecodePromise.Resolve(std::move(mPendingFrames), __func__);
-    mPendingFrames = DecodedData();
+    mDecodePromise.Resolve(mPendingFrames, __func__);
+    mPendingFrames.Clear();
     return;
   }
 
@@ -569,11 +569,11 @@ MediaChangeMonitor::DecodeFirstSample(MediaRawData* aSample)
   RefPtr<MediaChangeMonitor> self = this;
   mDecoder->Decode(aSample)
     ->Then(AbstractThread::GetCurrent()->AsTaskQueue(), __func__,
-           [self, this](MediaDataDecoder::DecodedData&& aResults) {
+           [self, this](const MediaDataDecoder::DecodedData& aResults) {
              mDecodePromiseRequest.Complete();
-             mPendingFrames.AppendElements(std::move(aResults));
-             mDecodePromise.Resolve(std::move(mPendingFrames), __func__);
-             mPendingFrames = DecodedData();
+             mPendingFrames.AppendElements(aResults);
+             mDecodePromise.Resolve(mPendingFrames, __func__);
+             mPendingFrames.Clear();
            },
            [self, this](const MediaResult& aError) {
              mDecodePromiseRequest.Complete();
@@ -619,7 +619,7 @@ MediaChangeMonitor::DrainThenFlushDecoder(MediaRawData* aPendingSample)
   mDecoder->Drain()
     ->Then(AbstractThread::GetCurrent()->AsTaskQueue(),
            __func__,
-           [self, sample, this](MediaDataDecoder::DecodedData&& aResults) {
+           [self, sample, this](const MediaDataDecoder::DecodedData& aResults) {
              mDrainRequest.Complete();
              if (!mFlushPromise.IsEmpty()) {
                // A Flush is pending, abort the current operation.
@@ -627,7 +627,7 @@ MediaChangeMonitor::DrainThenFlushDecoder(MediaRawData* aPendingSample)
                return;
              }
              if (aResults.Length() > 0) {
-               mPendingFrames.AppendElements(std::move(aResults));
+               mPendingFrames.AppendElements(aResults);
                DrainThenFlushDecoder(sample);
                return;
              }
diff --git a/xpcom/threads/MozPromise.h b/xpcom/threads/MozPromise.h
index bf8013cc990b..41b0247742da 100644
--- a/xpcom/threads/MozPromise.h
+++ b/xpcom/threads/MozPromise.h
@@ -1219,11 +1219,6 @@ public:
   template<typename ResolveValueType_>
   void Resolve(ResolveValueType_&& aResolveValue, const char* aMethodName)
   {
-    static_assert(
-      IsConvertible<ResolveValueType_,
-                    typename PromiseType::ResolveValueType>::value,
-      "Resolve() argument must be convertible to MozPromise's ResolveValueT");
-
     if (mMonitor) {
       mMonitor->AssertCurrentThreadOwns();
     }
@@ -1245,11 +1240,6 @@ public:
   template<typename RejectValueType_>
   void Reject(RejectValueType_&& aRejectValue, const char* aMethodName)
   {
-    static_assert(
-      IsConvertible<RejectValueType_,
-                    typename PromiseType::RejectValueType>::value,
-      "Reject() argument must be convertible to MozPromise's RejectValueT");
-
     if (mMonitor) {
       mMonitor->AssertCurrentThreadOwns();
     }