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-rw-r--r--modules/libpref/init/all.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 7cd18a9ff1..70488a4722 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -580,7 +580,7 @@ pref("media.mediasource.webm.enabled", true);
pref("media.mediasource.webm.audio.enabled", true);
#ifdef MOZ_AV1
-pref("media.av1.enabled", true);
+pref("media.av1.enabled", false);
#endif
// Use new MediaFormatReader architecture for plain ogg.