diff --git a/dom/media/MediaManager.cpp b/dom/media/MediaManager.cpp
index 61de78e8760e..3a3e448685c0 100644
--- a/dom/media/MediaManager.cpp
+++ b/dom/media/MediaManager.cpp
@@ -356,6 +356,13 @@ public:
            mVideoDevice->GetMediaSource() == dom::MediaSourceEnum::Browser;
   }
 
+  void GetSettings(dom::MediaTrackSettings& aOutSettings)
+  {
+    if (mVideoDevice) {
+      mVideoDevice->GetSource()->GetSettings(aOutSettings);
+    }
+  }
+
   // implement in .cpp to avoid circular dependency with MediaOperationTask
   // Can be invoked from EITHER MainThread or MSG thread
   void Stop();
@@ -1135,6 +1142,11 @@ public:
           return mListener->ApplyConstraintsToTrack(aWindow, mTrackID, aConstraints);
         }
 
+        void
+        GetSettings(dom::MediaTrackSettings& aOutSettings) override
+        {
+          mListener->GetSettings(aOutSettings);
+        }
 
         void Stop() override
         {
diff --git a/dom/media/MediaStreamTrack.cpp b/dom/media/MediaStreamTrack.cpp
index 39cde0c3c5f7..665994159d05 100644
--- a/dom/media/MediaStreamTrack.cpp
+++ b/dom/media/MediaStreamTrack.cpp
@@ -250,14 +250,16 @@ MediaStreamTrack::Stop()
   mReadyState = MediaStreamTrackState::Ended;
 }
 
-void MediaStreamTrack::GetConstraints(dom::MediaTrackConstraints& aResult)
+void
+MediaStreamTrack::GetConstraints(dom::MediaTrackConstraints& aResult)
 {
   aResult = mConstraints;
 }
 
-void MediaStreamTrack::GetSettings(dom::MediaTrackSettings& aResult)
+void
+MediaStreamTrack::GetSettings(dom::MediaTrackSettings& aResult)
 {
-  aResult = mSettings;
+  GetSource().GetSettings(aResult);
 }
 
 already_AddRefed<Promise>
diff --git a/dom/media/MediaStreamTrack.h b/dom/media/MediaStreamTrack.h
index 14ee174b2a72..c6bdd12f3601 100644
--- a/dom/media/MediaStreamTrack.h
+++ b/dom/media/MediaStreamTrack.h
@@ -134,6 +134,12 @@ public:
   ApplyConstraints(nsPIDOMWindowInner* aWindow,
                    const dom::MediaTrackConstraints& aConstraints);
 
+  /**
+   * Same for GetSettings (no-op).
+   */
+  virtual void
+  GetSettings(dom::MediaTrackSettings& aResult) {};
+
   /**
    * Called by the source interface when all registered sinks have unregistered.
    */
@@ -213,6 +219,9 @@ public:
 
   MediaSourceEnum GetMediaSource() const override { return mMediaSource; }
 
+  void
+  GetSettings(dom::MediaTrackSettings& aResult) override {}
+
   void Stop() override {}
 
 protected:
@@ -436,7 +445,6 @@ protected:
   bool mEnabled;
   const bool mRemote;
   dom::MediaTrackConstraints mConstraints;
-  dom::MediaTrackSettings mSettings;
 };
 
 } // namespace dom
diff --git a/dom/media/webrtc/MediaEngine.h b/dom/media/webrtc/MediaEngine.h
index 1eb7f1270876..39b14897e664 100644
--- a/dom/media/webrtc/MediaEngine.h
+++ b/dom/media/webrtc/MediaEngine.h
@@ -197,6 +197,12 @@ public:
       const nsTArray<const NormalizedConstraintSet*>& aConstraintSets,
       const nsString& aDeviceId) const = 0;
 
+  void GetSettings(dom::MediaTrackSettings& aOutSettings)
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    aOutSettings = mSettings;
+  }
+
 protected:
   // Only class' own members can be initialized in constructor initializer list.
   explicit MediaEngineSource(MediaEngineState aState)
@@ -217,6 +223,8 @@ protected:
   PRThread* mOwningThread;
 #endif
   bool mHasFakeTracks;
+  // Main-thread only:
+  dom::MediaTrackSettings mSettings;
 };
 
 /**
diff --git a/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp b/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp
index ee21cecae957..d8c669fa802a 100644
--- a/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp
+++ b/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp
@@ -36,6 +36,9 @@ MediaEngineRemoteVideoSource::MediaEngineRemoteVideoSource(
     mInShutdown(false)
 {
   MOZ_ASSERT(aMediaSource != dom::MediaSourceEnum::Other);
+  mSettings.mWidth.Construct(0);
+  mSettings.mHeight.Construct(0);
+  mSettings.mFrameRate.Construct(0);
   Init();
 }
 
@@ -327,7 +330,7 @@ MediaEngineRemoteVideoSource::UpdateExisting(AllocationHandle* aHandle,
         return NS_ERROR_FAILURE;
       }
       mState = kAllocated;
-      mLastCapability = mCapability;
+      SetLastCapability(mCapability);
       LOG(("Video device %d allocated for %s", mCaptureIndex,
            aHandle->mOrigin.get()));
       break;
@@ -342,7 +345,7 @@ MediaEngineRemoteVideoSource::UpdateExisting(AllocationHandle* aHandle,
           LOG(("StartCapture failed"));
           return NS_ERROR_FAILURE;
         }
-        mLastCapability = mCapability;
+        SetLastCapability(mCapability);
       }
       break;
 
@@ -357,6 +360,23 @@ MediaEngineRemoteVideoSource::UpdateExisting(AllocationHandle* aHandle,
   return NS_OK;
 }
 
+void
+MediaEngineRemoteVideoSource::SetLastCapability(
+    const webrtc::CaptureCapability& aCapability)
+{
+  mLastCapability = mCapability;
+
+  webrtc::CaptureCapability cap = aCapability;
+  RefPtr<MediaEngineRemoteVideoSource> that = this;
+
+  NS_DispatchToMainThread(media::NewRunnableFrom([this, that, cap]() mutable {
+    mSettings.mWidth.Value() = cap.width;
+    mSettings.mHeight.Value() = cap.height;
+    mSettings.mFrameRate.Value() = cap.maxFPS;
+    return NS_OK;
+  }));
+}
+
 void
 MediaEngineRemoteVideoSource::NotifyPull(MediaStreamGraph* aGraph,
                                          SourceMediaStream* aSource,
diff --git a/dom/media/webrtc/MediaEngineRemoteVideoSource.h b/dom/media/webrtc/MediaEngineRemoteVideoSource.h
index 907cc1b02ee9..74de4e5bed0f 100644
--- a/dom/media/webrtc/MediaEngineRemoteVideoSource.h
+++ b/dom/media/webrtc/MediaEngineRemoteVideoSource.h
@@ -130,6 +130,7 @@ private:
   void Init();
   size_t NumCapabilities() const override;
   void GetCapability(size_t aIndex, webrtc::CaptureCapability& aOut) const override;
+  void SetLastCapability(const webrtc::CaptureCapability& aCapability);
 
   /* UpdateExisting - Centralized function to apply constraints and restart
    * device as needed, considering all allocations and changes to one.