Build me a FireFox or Chrome browser extension

Hello, my name is Tyler and I am looking for a freelancer with experience building browser extensions and affiliate links. The project we would like done is for a non-profit foundation. The extension would be capable of redirecting users to URL's that are affiliate links. For example, if a user with this extension goes to a sign up page for a subscription service such as Blue Apron, the browser should redirect the user to our foundations affiliate URL. We should be able to add affiliate links to the extension as we develop affiliate partnerships. We would also like to have the capability of adding dialogue when a user has been redirected to an affiliate URL. For example, when the user is on our affiliated URL for Blue Apron, a message would pop up saying "By signing up for Blue Apron, 10% of your purchase will be donated to XYZ foundation!" Bonus points if the extension is capable of tracking which users use each affiliate link so the foundation can keep track of each user's contributions. Looking forward to hearing ideas on how to bring this to fruition!