--- a/xpcom/base/ErrorList.h
+++ b/xpcom/base/ErrorList.h
@@ -971,16 +971,28 @@
   /* ======================================================================= */
   /* 41: NS_ERROR_MODULE_DOM_MEDIA */
   /* ======================================================================= */
 #define MODULE NS_ERROR_MODULE_DOM_MEDIA
   /* HTMLMediaElement API errors from https://html.spec.whatwg.org/multipage/embedded-content.html#media-elements */
   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
 
   /* ======================================================================= */
   /* 51: NS_ERROR_MODULE_GENERAL */
   /* ======================================================================= */
 #define MODULE NS_ERROR_MODULE_GENERAL
   /* Error code used internally by the incremental downloader to cancel the
    * network channel when the download is already complete. */