Developing own firefox add-on along with other add-on's?

The question is unclear, but here is some information from Mozilla.

The question is unclear, but here is some information from Mozilla. How to develop a Firefox extension and Developing Mozilla addons.

I agree with this .. But I am planning to develop the a new add-on , along with already existing add-on providing new features for my own purpose. – joe Jun 13 '09 at 17:37.

You will find the code of all installed extensions in the firefox profile folder. In my vista machine, it is located at C:\Users\\appdata\Roaming\Mozilla\Firefox\Profiles\. Default\extensions\ Unzip the jars and learn the code, edit as per your needs and restart firefox.

Remember that when firefox automatically updates the extension, your changes will be overriden. If something goes wrong, start firefox from cmd with -P switch to create a new profile or goto safe mode using firefox -safe-mode and uninstall and reinstall the extension from its website.

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