User javascript code for web extension

I have an old script that no longer works. I need a new script that functions in a similar way. The script slightly modifies the user interaction with the browser-based game, .io website. It was run previously using Tampermonkey and/or greasemonkey browser extensions. The script options appear on-screen, however no effects are noticed. The file is attached. Everything is honestly unnecessary, except I need the zoom and speed functions to work again.