Bug 875874 - Filter out hidden content too. r=marcoz

accessible/src/jsat/TraversalRules.jsm

@@ -26,7 +26,8 @@ BaseTraversalRule.prototype = {
     },
 
     preFilter: Ci.nsIAccessibleTraversalRule.PREFILTER_DEFUNCT |
-    Ci.nsIAccessibleTraversalRule.PREFILTER_INVISIBLE,
+    Ci.nsIAccessibleTraversalRule.PREFILTER_INVISIBLE |
+    Ci.nsIAccessibleTraversalRule.PREFILTER_ARIA_HIDDEN,
 
     match: function BaseTraversalRule_match(aAccessible)
     {