--- a/dom/media/MediaManager.cpp
+++ b/dom/media/MediaManager.cpp
@@ -4096,16 +4096,18 @@ SourceListener::SetEnabledFor(TrackID aT
           (MozPromiseHolder<DeviceOperationPromise>& h) {
             h.Resolve(aEnable ? device->Start() : device->Stop(), __func__);
           });
     }, []() {
       // Timer was canceled by us. We signal this with NS_ERROR_ABORT.
       return DeviceOperationPromise::CreateAndResolve(NS_ERROR_ABORT, __func__);
     })->Then(GetMainThreadSerialEventTarget(), __func__,
     [self, this, &state, aTrackID, aEnable](nsresult aResult) mutable {
+      MOZ_ASSERT_IF(aResult != NS_ERROR_ABORT,
+                    state.mDeviceEnabled == aEnable);
       MOZ_ASSERT(state.mOperationInProgress);
       state.mOperationInProgress = false;
 
       if (state.mStopped) {
         // Device was stopped on main thread during the operation. Nothing to do.
         return;
       }
 
@@ -4115,19 +4117,16 @@ SourceListener::SetEnabledFor(TrackID aT
            aTrackID == kAudioTrack ? "audio" : "video",
            aTrackID,
            NS_SUCCEEDED(aResult) ? "succeeded" : "failed"));
 
       if (NS_FAILED(aResult) && aResult != NS_ERROR_ABORT) {
         // This path handles errors from starting or stopping the device.
         // NS_ERROR_ABORT are for cases where *we* aborted. They need graceful
         // handling.
-        MOZ_ASSERT(state.mDeviceEnabled != aEnable,
-                   "If operating the device failed, the device's `enabled` "
-                   "state must remain at its old value");
         if (aEnable) {
           // Starting the device failed. Stopping the track here will make the
           // MediaStreamTrack end after a pass through the MediaStreamGraph.
           StopTrack(aTrackID);
         } else {
           // Stopping the device failed. This is odd, but not fatal.
           MOZ_ASSERT_UNREACHABLE("The device should be stoppable");
 
@@ -4137,17 +4136,16 @@ SourceListener::SetEnabledFor(TrackID aT
         }
         return;
       }
 
       // This path is for a device operation aResult that was success or
       // NS_ERROR_ABORT (*we* canceled the operation).
       // At this point we have to follow up on the intended state, i.e., update
       // the device state if the track state changed in the meantime.
-      MOZ_ASSERT_IF(NS_SUCCEEDED(aResult), state.mDeviceEnabled == aEnable);
 
       if (state.mTrackEnabled == state.mDeviceEnabled) {
         // Intended state is same as device's current state.
         // Nothing more to do.
         return;
       }
 
       // Track state changed during this operation. We'll start over.