A client system interacts with a sandbox environment to host a web browser control within the sandbox. A webpage URL, a URL to a script file to be injected into the webpage, a name of the script method to be invoked, and the event to look for to trigger the script method sent to the sandbox environment from the client. The sandbox environment downloads the script file from the cloud using the script URL and loads a rendering engine with the specified webpage URL. The specified script file is subsequently injected into the loaded webpage at the sandbox environment. After the specified event is fired, the sandbox environment triggers the specified script method and stores the results within a results array, accessible to the client system.