xp com plugin for firefox

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C++

Javascript

COM

VC9.0

VisualC++

I want to create a xpcom plugin.For now want to run a "Hello world" for testing.
I have downloaded gecko sdk.but found no helpfull meterial in net.

this below link explains the same about the older mozilla.
http://nerdlife.net/building-a-c-xpcom-component-in-windows/[^]

though I am able to compile and create the .dll .xpt successfully but not able to
cal from my plugin apps.

the latest gecko sdk has removed so many header files, so not able to compile the above code.
Please give me some guidence
any helpfull link or any instruction.