Index: components/mediacore/manager/src/sbMediacoreSequencer.cpp
===================================================================
--- components/mediacore/manager/src/sbMediacoreSequencer.cpp	(revision 12076)
+++ components/mediacore/manager/src/sbMediacoreSequencer.cpp	(working copy)
@@ -1947,6 +1947,7 @@
   nsresult rv = NS_ERROR_UNEXPECTED;
   nsCOMPtr<nsIMutableArray> array =
     do_CreateInstance("@songbirdnest.com/moz/xpcom/threadsafe-array;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);

   sequence_t::const_iterator it = mSequence.begin();
   for(; it != mSequence.end(); ++it) {
@@ -1961,6 +1962,8 @@
     NS_ENSURE_SUCCESS(rv, rv);
   }

+  NS_ADDREF(*aCurrentSequence = array);
+
   return NS_OK;
 }