Modified version of https://kickassapp.com/ that supports WASD.
To start destroying the web in retro space fashion you'll need to create a bookmark in your web browser with any name (e.g. "Kick Ass WASD") and the following cdn.jsdelivr.net alternative URL as JS files can't be loaded directly from GitHub (notes belows).
javascript:var%20KICKASSVERSION='2.0';var%20s%20=%20document.createElement('script');s.type='text/javascript';document.body.appendChild(s);s.src='//cdn.jsdelivr.net/gh/michaelharper/Kick-Ass-App-WASD/kickass.js';void(0);
In 2013, GitHub started using X-Content-Type-Options: nosniff, which instructs more modern browsers to enforce strict MIME type checking. It then returns the raw files in a MIME type returned by the server, preventing the browser from using the file as-intended (if the browser honors the setting).