diff --git a/widget/cocoa/nsCocoaFeatures.mm b/widget/cocoa/nsCocoaFeatures.mm
index c9ab839ea509..f52a3df4f4ca 100644
--- a/widget/cocoa/nsCocoaFeatures.mm
+++ b/widget/cocoa/nsCocoaFeatures.mm
@@ -12,6 +12,7 @@
 // This API will not work for OS X 10.10, see Gestalt.h.
 
 #include "nsCocoaFeatures.h"
+#include "nsCocoaUtils.h"
 #include "nsDebug.h"
 #include "nsObjCExceptions.h"
 
@@ -51,6 +52,10 @@ nsCocoaFeatures::InitializeVersionNumbers()
 {
     NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
 
+    // Provide an autorelease pool to avoid leaking Cocoa objects,
+    // as this gets called before the main autorelease pool is in place.
+    nsAutoreleasePool localPool;
+
     int major, minor, bugfix;
     GetSystemVersion(major, minor, bugfix);