I am new to extension development and I want to develop extension like
"Flock My World". Actually what I want to do is, open new tab at
Firefox startup and create HTML page without loading any external web
page. That means I want to create the HTML content for that page
within my extension.

Did anyone know firefox extension which do something like I
described above. If you can point me to some information, it'll be
really helpful to me.

Thanks in advance,