Can the window object be modified from a Chrome extension?

Question

I would like to make a Chrome extension that provides a new object inside window. When a web page is viewed in a browser with the extension loaded, I would like

Answer 1

Thanks to the other answers here, this is what I'm using:

((source)=>{
  const script = document.createElement("script");
  script.text = `(${source.toString()})();`;
  document.documentElement.appendChild(script);
})(function (){

  // Your code here
  // ...

})

Works great, no issues.