Bug 746971 - test/events_focus_tabbox.xul fails on startup on OS X, disable

accessible/tests/mochitest/events/test_focus_tabbox.xul

@@ -27,6 +27,12 @@
     var gQueue = null;
     function doTests()
     {
+      if (MAC) {
+        todo(false, "Tests disabled because of imminent failure.");
+        SimpleTest.finish();
+        return;
+      }
+
       // Test focus events.
       gQueue = new eventQueue();