Write a Simple Chrome Extension

Chrome Extension to Load a webpage inside a popup. 1. Extension needs to fetch the current url. 2. Parse url from Say "https://www.freelancer.in/post-project" to "freelancer.in" 3. Append the parsed string in 2 to a url "http://<domain>/freelancer" 4. Load the Web page "http://<domain>/freelancer" inside a popup 5. While the web page is loading, it should display a 'loading' animation You need to let me know how to customize the size of the popup