diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index d88b918d00..944caef76c 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -582,14 +582,8 @@ 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)
-pref("media.mediasource.webm.enabled", false);
-#else
 pref("media.mediasource.webm.enabled", true);
-#endif
 pref("media.mediasource.webm.audio.enabled", true);
 
 #ifdef MOZ_AV1