--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -556,17 +556,17 @@ pref("media.webvtt.regions.enabled", fal
 // AudioTrack and VideoTrack support
 pref("media.track.enabled", false);
 
 // Whether to enable MediaSource support.
 pref("media.mediasource.enabled", true);
 
 pref("media.mediasource.mp4.enabled", true);
 
-#if defined(XP_WIN) || defined(XP_MACOSX) || defined(MOZ_WIDGET_GONK)
+#if defined(XP_WIN) || defined(XP_MACOSX) || defined(MOZ_WIDGET_GONK) || defined(MOZ_WIDGET_ANDROID)
 pref("media.mediasource.webm.enabled", false);
 #else
 pref("media.mediasource.webm.enabled", true);
 #endif
 pref("media.mediasource.webm.audio.enabled", true);
 
 // Use new MediaFormatReader architecture for plain ogg.
 pref("media.format-reader.ogg", true);