bug 441974 - disabled test for y coordinate in nsIAccessibleImage tests

accessible/tests/mochitest/test_nsIAccessibleImage.html

@@ -75,8 +75,8 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=429659
                                  parentAccHeight);
         is(parentAccX.value + parentX.value, screenX.value,
            "Wrong screen x coordinate for " + aID + "!");
-        is(parentAccY.value + parentY.value, screenY.value,
-           "Wrong screen y coordinate for " + aID + "!");
+// XXX see bug 456344        is(parentAccY.value + parentY.value, screenY.value,
+//           "Wrong screen y coordinate for " + aID + "!");
       }
 
       var width = {}, height = {};