Jquery.UI Accordion in iframe shim over Google Earth Plugin - display broken with Firefox

Jquery.UI Accordion in iframe shim over Google Earth Plugin - display broken with Firefox

Hello,
I setup a iframe shim to display a accordion over Google Earth Plugin.
It's work great with Chrome, but display is broken with firefox.
I don't know exactly what happen, but header are not show when a
section is close., and i can see some ugly thing under the active
section.
More strange, when i reduce & restore Firefox, or when i change Tabs,
display become good, but after any action it's break again..
The bug can be see here : http://fire.vakanala.org (concerning the How
to use/Choose Dataset Menu on the left).
Is there somebody how have a idea about fixe this?
All the bests,
Jérôme
ps : sorry for my english, it's not my maternal language
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