Custom Firefox Plugin Needed

Hi there,? This is the first phase of a larger project, and it is meant to asses the skillset of the? coder. After this phase of the project is completed, we will require the coder to? continue with the second phase ( as a separate project ). We need a custom Firefox plugin that will be able to insert html into the browser window? when the user is accessing a specific website. The plugin should also poll an xml feed from a webserver every 3 seconds, process that feed,? and based on the results it should interact with the website that teh user is viewing ( it should be able to interact with the DOM elements on that site - for example, it? should be able to activate the .click() event on a specific button ). Thanks Mark