XPCOM Shockwave Flash C++

I recently started "playing" with xpcom, and I would like to know if there is a way do interact with a 开发者_运维知识库Shockwave flash element.

In IE I can use the IShockwaveFlash interface, but for the Firefox I can't 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 query a nsIDOMHTMLEmbedElement for the nsIFlash5 interface, but I'm unable to use any of the functions, since it "crashes".

Thanks.