Screen readers, especially on Windows, react very sensitively to a menu and expect certain children. Some, for example, only accept menu items, menu checkboxes or menu radio items, but no full-blown widgets like a rich listbox. So, this patch changes the role for the panels that pop up with search results or auto complete entries, to be like a normal grouping panel.
MozReview-Commit-ID: GCVXAPttV1M
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extra : rebase_source : 8d0559af13e52921dbdd0eeeafd16bb9f771d534