diff --git a/xpcom/base/ErrorList.h b/xpcom/base/ErrorList.h
index f1f0a0710334..711de7ca7058 100644
--- a/xpcom/base/ErrorList.h
+++ b/xpcom/base/ErrorList.h
@@ -976,6 +976,18 @@
   ERROR(NS_ERROR_DOM_MEDIA_ABORT_ERR,           FAILURE(1)),
   ERROR(NS_ERROR_DOM_MEDIA_NOT_ALLOWED_ERR,     FAILURE(2)),
   ERROR(NS_ERROR_DOM_MEDIA_NOT_SUPPORTED_ERR,   FAILURE(3)),
+
+  /* HTMLMediaElement internal decoding error */
+  ERROR(NS_ERROR_DOM_MEDIA_DECODE_ERR,          FAILURE(4)),
+  ERROR(NS_ERROR_DOM_MEDIA_FATAL_ERR,           FAILURE(5)),
+  ERROR(NS_ERROR_DOM_MEDIA_METADATA_ERR,        FAILURE(6)),
+  ERROR(NS_ERROR_DOM_MEDIA_OVERFLOW_ERR,        FAILURE(7)),
+  ERROR(NS_ERROR_DOM_MEDIA_END_OF_STREAM,       FAILURE(8)),
+  ERROR(NS_ERROR_DOM_MEDIA_WAITING_FOR_DATA,    FAILURE(9)),
+  ERROR(NS_ERROR_DOM_MEDIA_CANCELED,            FAILURE(10)),
+  ERROR(NS_ERROR_DOM_MEDIA_MEDIASINK_ERR,       FAILURE(11)),
+  ERROR(NS_ERROR_DOM_MEDIA_DEMUXER_ERR,         FAILURE(12)),
+  ERROR(NS_ERROR_DOM_MEDIA_CDM_ERR,             FAILURE(13)),
 #undef MODULE
 
   /* ======================================================================= */