title: JS get file previously downloaded by the browser
body: <p>Is there a way for JS to get a file from memory, Instead of making an http call every time the file is required?
  I am trying to get a json file that is already loaded by an external library, when I make my request the browser makes an http call, it doesn't matter if I use fetch or xhr to make the call..
  <a href="https://i.stack.imgur.com/qeiGF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qeiGF.png" alt="enter image description here" /></a></p>