Right-click on the page and select "Inspect" from the context menu. This will open the developer tools for the page. In the developer tools window, click on the "Sources" tab. This will show you a list of the scripts that are being used on the page.
Sam inherits the car following Dean's death in the series finale. The Impala remained with him until his old age. It is not known where the car went after Sam's death, but it may have been inherited by his son.