How to create Firefox add-on

Hi there, I want to create a firefox add-on, but i realy dont know how to create,

is there any tutorials like

what is xpi?

how to create a xpi file? etc

 

here you are:

http://roachfiend.com/archives/2004/12/08/how-to-create-firefox-extensions/

 

thanks Nerv I'll check it

 

How can I edit a xpi file?

 

This is hard to understand. I thought it was a tutorial or a list of add-ons. And there's a roach near my clock!