Add-on for firefox

I need the following add-on for firefox. The add-on will have a toolbar, with one button called "list cookies". When I click that button, it needs to list all the cookies from the current website. (the cookies will need to be shown in a new tab) The add-on will be configurable through a preference window. The preference window will have one text-field, called "JavaFilterFunction". If this text field is left blank, the add-on will work as previously noted. If this text field is not empty: when I click to the "list cookies" button, it will call a java function introduced in this "JavaFilterFunction" text field. It will pass an array with all the cookies from the current website. The java function will return a string, that the add-on will show in a new tab. +++++++++++++++++ I will need also the source code and instructions on how to install it. I know that this functionality (listing the cookies) can be achieved using Firefox and/or its already available add-ons, such as WebDeveloper. However, the objective of this project is to make a new add-on from scratch. Thanks, David