diff -urNp seamonkey-2.53.11-orig/dom/media/platforms/agnostic/DAV1DDecoder.cpp seamonkey-2.53.11-dwok/dom/media/platforms/agnostic/DAV1DDecoder.cpp
--- seamonkey-2.53.11-orig/dom/media/platforms/agnostic/DAV1DDecoder.cpp	2022-03-22 21:13:11.186284594 +0100
+++ seamonkey-2.53.11-dwok/dom/media/platforms/agnostic/DAV1DDecoder.cpp	2022-03-22 21:10:17.267709130 +0100
@@ -29,13 +29,8 @@ RefPtr<MediaDataDecoder::InitPromise> DA
   } else if (mInfo.mDisplay.width >= 1024) {
     decoder_threads = 4;
   }
-  settings.n_frame_threads =
+  settings.n_threads =
       static_cast<int>(std::min(decoder_threads, GetNumberOfProcessors()));
-  // There is not much improvement with more than 2 tile threads at least with
-  // the content being currently served. The ideal number of tile thread would
-  // much the tile count of the content. Maybe dav1d can help to do that in the
-  // future.
-  settings.n_tile_threads = 2;
 
   int res = dav1d_open(&mContext, &settings);
   if (res < 0) {