Creating Add-on for Firefox using XPCOM and JavaScript

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Javascript

XPCOM

Hi all,
I need to create an Add-on for Firefox using XPCOM and JavaScript
I refered the following link,
https://developer.mozilla.org/en-US/docs/How_to_Build_an_XPCOM_Component_in_Javascript[^]

But I am unclear on the steps mentioned in the link.

It will be more helpfull if some one provide me a working sample Application of Add-on for Firefox using XPCOM and javaScript and steps to run the application.

Thanks in Advance!