Enhancement includes:
Class Renaming: Renamed MainProgram to XSSScanner to better reflect its purpose.
Improved Method Naming: Renamed the Main() method to run() for clarity.
Argument for Payload File: Added an argument -f or --payload-file to allow specifying a custom file for payloads.
Error Handling: Kept the error handling for requests exceptions.
Main Execution Block: Wrapped the code into an if name == "main": block for better module reusability.
Simplified Multithreading: Utilized executor.map() for simplicity in handling multithreading. It's more concise than submitting individual tasks.