diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index 43feb76..33a49b8 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -308,7 +308,7 @@
 
 // http://tc39.github.io/ecmascript_sharedmem/shmem.html
 const base::Feature kSharedArrayBuffer{"SharedArrayBuffer",
-                                       base::FEATURE_ENABLED_BY_DEFAULT};
+                                       base::FEATURE_DISABLED_BY_DEFAULT};
 
 // An experiment to require process isolation for the sign-in origin,
 // https://accounts.google.com.  Launch bug: https://crbug.com/739418.