diff --git a/b2g/app/b2g.js b/b2g/app/b2g.js
index 58bca9140ea2..4af33ef12ed0 100644
--- a/b2g/app/b2g.js
+++ b/b2g/app/b2g.js
@@ -318,6 +318,11 @@ pref("media.cache_readahead_limit", 30);
 // Enable/Disable Gonk Decoder Module
 pref("media.fragmented-mp4.gonk.enabled", true);
 #endif
+
+//Encrypted media extensions.
+pref("media.eme.enabled", true);
+pref("media.eme.apiVisible", true);
+
 // The default number of decoded video frames that are enqueued in
 // MediaDecoderReader's mVideoQueue.
 pref("media.video-queue.default-size", 3);
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index a0e479931fc3..2bbf4c880259 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -438,7 +438,7 @@ pref("media.track.enabled", false);
 // We want to enable on non-release  builds and on release windows and mac
 // but on release builds restrict to YouTube. We don't enable for other
 // configurations because code for those platforms isn't ready yet.
-#if defined(XP_WIN) || defined(XP_MACOSX)
+#if defined(XP_WIN) || defined(XP_MACOSX) || defined(MOZ_WIDGET_GONK)
 pref("media.mediasource.enabled", true);
 #else
 pref("media.mediasource.enabled", false);