Chrome and Firefox Extension (plugin)

I'm looking for a developer that will make Chrome and Firefox extensions for my Listing site. Site contains top websites list from various categories. like top social networking/bookmarking/classified/adsense alternatives etc.. with some traffic details and thumbshot The extension should look like this one: ( only for look reference functions are very simple it will contain only link to particular site) [login to view URL] [login to view URL] It should: - left side categories which we are having on site - right side list of top sites from each category - click and visit that site / few categories have more than hundred sites paging for them - 475 user already using simple chrome app, upgrade them to new version (extension) Please provide list of plugins already made.