Index: src/orca/scripts/toolkits/Gecko/script.py
===================================================================
--- src/orca/scripts/toolkits/Gecko/script.py	(revision 4493)
+++ src/orca/scripts/toolkits/Gecko/script.py	(working copy)
@@ -2914,6 +2914,10 @@
             #
             elif obj.getRole() in [pyatspi.ROLE_ENTRY, pyatspi.ROLE_LINK]:
                 return obj.parent.getRole() != pyatspi.ROLE_COMBO_BOX
+            # Some ARIA alerts are navigable. See bug 570532.
+            #
+            elif obj.getRole() == pyatspi.ROLE_ALERT:
+                return True
             # All other ARIA widgets
             else:
                 return False
