XPCOM Shockwave Flash C ++

Question

I recently started playing with xpcom, and I would like to know if there is a way to interact with the Shockwave flash element.

In IE, I can use the IShockwaveFlash interface, but for Firefox I can not find any interface.

I tried using the nsIFlash5 definition from the header file "wrap_XPCOM_3rdparty.h" (acquired from the XulRunner-1.9 source code link ) and I can sucessfuly request nsIDOMHTMLEmbedElement for the nsIFlash5 interface, but I cannot use any functions since it is "crashing".

Thank.