Index: head/www/firefox/files/patch-dom_media_flac_FlacDecoder.cpp
===================================================================
--- head/www/firefox/files/patch-dom_media_flac_FlacDecoder.cpp	(revision 545253)
+++ head/www/firefox/files/patch-dom_media_flac_FlacDecoder.cpp	(revision 545254)
@@ -1,26 +1,26 @@
 Enable FLAC on platforms without ffvpx like powerpc*
 
 diff --git dom/media/flac/FlacDecoder.cpp dom/media/flac/FlacDecoder.cpp
 index 53fc3c9937f7..b23771ab80fa 100644
 --- dom/media/flac/FlacDecoder.cpp
 +++ dom/media/flac/FlacDecoder.cpp
 @@ -7,6 +7,7 @@
  #include "FlacDecoder.h"
  #include "MediaContainerType.h"
  #include "mozilla/StaticPrefs_media.h"
 +#include "PDMFactory.h"
  
  namespace mozilla {
  
 @@ -14,6 +15,11 @@ namespace mozilla {
  bool FlacDecoder::IsEnabled() {
  #ifdef MOZ_FFVPX
    return StaticPrefs::media_flac_enabled();
 +#elif defined(MOZ_FFMPEG)
 +  RefPtr<PDMFactory> platform = new PDMFactory();
 +  return StaticPrefs::media_flac_enabled() &&
-+         platform->SupportsMimeType(NS_LITERAL_CSTRING("audio/flac"),
++         platform->SupportsMimeType("audio/flac"_ns,
 +                                    /* DecoderDoctorDiagnostics* */ nullptr);
  #else
    // Until bug 1295886 is fixed.
    return false;