--- a/dom/media/MediaDecoderStateMachine.cpp
+++ b/dom/media/MediaDecoderStateMachine.cpp
@@ -3116,17 +3116,19 @@ void MediaDecoderStateMachine::SetVideoD
 void MediaDecoderStateMachine::SetVideoDecodeModeInternal(VideoDecodeMode aMode)
 {
   MOZ_ASSERT(OnTaskQueue());
   LOG("VideoDecodeModeChanged: VideoDecodeMode=(%s->%s), mVideoDecodeSuspended=%c",
       mVideoDecodeMode == VideoDecodeMode::Normal ? "Normal" : "Suspend",
       aMode == VideoDecodeMode::Normal ? "Normal" : "Suspend",
       mVideoDecodeSuspended ? 'T' : 'F');
 
-  if (!MediaPrefs::MDSMSuspendBackgroundVideoEnabled()) {
+  // Should not suspend decoding if we don't turn on the pref.
+  if (!MediaPrefs::MDSMSuspendBackgroundVideoEnabled() &&
+      aMode == VideoDecodeMode::Suspend) {
     return;
   }
 
   if (aMode == mVideoDecodeMode) {
     return;
   }
 
   // Set new video decode mode.