Orca Submenus in Firefox 3

[hermann <steppenwolf2 onlinehome de>]

Hi,
I discovered a strange phenomenon in Firefox 3 together with Orca:
Those menu items in the bookmarks menu, that have a submenu are not
accessible as long as the speech of Orca is activated. If you try to
open a submenu, youget bounced back to the main bookmarks menu.
When I turn speech off temporarily, only using braille, I can access
those submenus.
Did anyone encounter such an issue?
I'm using espeak as speech output.
Note: This never happened in Firefox 2.x.
Regards
Hermann