We need a chrome and a firefox extension which basically does some simple things (content scripts) : getelementbytagname() and modify it with some data coming from a server.
Lets talk more on the project. We need an initial [login to view URL] will be based on the combination of Proposed Price(70%) + Delivery Time (30%).
I made Firefox and Chrome extensions in the past, this is an easy task and I'm not asking for a lot of money. If you want, we can discuss further through PM.