Index: src/orca/Gecko.py
===================================================================
--- src/orca/Gecko.py	(revision 2632)
+++ src/orca/Gecko.py	(working copy)
@@ -3760,9 +3760,14 @@
         # loading.
         #
         inDialog = self.getContainingRole(event.source, rolenames.ROLE_DIALOG)
+        if not inDialog:
+            inDialog = self.getContainingRole(event.source,
+                                              rolenames.ROLE_ALERT)
+
         if self._loadingDocumentContent \
            and event.source \
            and event.source.role != rolenames.ROLE_DIALOG \
+           and event.source.role != rolenames.ROLE_ALERT \
            and not inDialog:
             return
 
