couponxplorer.com - Plugin like couponxplorer.com

I want to create a plugin like couponxplorer.com. Details: Must be able to install on Firefox, internet explorer and Google chrome Must change the users search to my own browser (like Mywebsearch) Must have a button that users click on called coupons (can link to other coupon sites) Must be upgradeable. Etc. I will send more information to those who bid.