Whats the error?
You are trying to look at the extension on a Twitch page? And not loading the testing base URI directly?
Extensions are uplaoded to a sub folder tree of that testing base URI so you need to load the extension via the frame on a Twitch page
Also note you have quite a few HTMl’s there, you can’t navigation from one to another. So you might need to adjust your JS to for pagin without navigatin.