--- a/dom/media/MediaPrefs.h
+++ b/dom/media/MediaPrefs.h
@@ -137,16 +137,17 @@ private:
   DECL_MEDIA_PREF("media.decoder.fuzzing.video-output-minimum-interval-ms", PDMFuzzingInterval, uint32_t, 0);
   DECL_MEDIA_PREF("media.decoder.fuzzing.dont-delay-inputexhausted", PDMFuzzingDelayInputExhausted, bool, true);
   DECL_MEDIA_PREF("media.decoder.recycle.enabled",            MediaDecoderCheckRecycling, bool, false);
   DECL_MEDIA_PREF("media.gmp.decoder.enabled",                PDMGMPEnabled, bool, true);
   DECL_MEDIA_PREF("media.gmp.decoder.aac",                    GMPAACPreferred, uint32_t, 0);
   DECL_MEDIA_PREF("media.gmp.decoder.h264",                   GMPH264Preferred, uint32_t, 0);
   DECL_MEDIA_PREF("media.eme.audio.blank",                    EMEBlankAudio, bool, false);
   DECL_MEDIA_PREF("media.eme.video.blank",                    EMEBlankVideo, bool, false);
+  DECL_MEDIA_PREF("media.eme.chromium-api.enabled",           EMEChromiumAPIEnabled, bool, false);
 
   // MediaDecoderStateMachine
   DECL_MEDIA_PREF("media.suspend-bkgnd-video.enabled",        MDSMSuspendBackgroundVideoEnabled, bool, false);
   DECL_MEDIA_PREF("media.suspend-bkgnd-video.delay-ms",       MDSMSuspendBackgroundVideoDelay, AtomicUint32, SUSPEND_BACKGROUND_VIDEO_DELAY_MS);
   DECL_MEDIA_PREF("media.dormant-on-pause-timeout-ms",        DormantOnPauseTimeout, int32_t, 5000);
 
   // WebSpeech
   DECL_MEDIA_PREF("media.webspeech.synth.force_global_queue", WebSpeechForceGlobal, bool, false);

--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -362,16 +362,18 @@ pref("media.gmp.decoder.h264", 0);
 #ifdef MOZ_RAW
 pref("media.raw.enabled", true);
 #endif
 pref("media.ogg.enabled", true);
 pref("media.opus.enabled", true);
 pref("media.wave.enabled", true);
 pref("media.webm.enabled", true);
 
+pref("media.eme.chromium-api.enabled", false);
+
 #ifdef MOZ_APPLEMEDIA
 #ifdef MOZ_WIDGET_UIKIT
 pref("media.mp3.enabled", true);
 #endif
 pref("media.apple.mp3.enabled", true);
 pref("media.apple.mp4.enabled", true);
 #endif