Google Chrome Extension

In Google Chrome, we manually go to site X, get a used car details (make, model, year, mileage, fuel type, gear type), then go to site Y in order to check the market price of a similar car. We would like to automate this process by highlighting the details (text) of a car (make, model, year, mileage, fuel type, gear type) on site X and then automatically construct a valid URL which we can use to open a page on site Y that can list similar cars, so that we can check the market price of similar cars.