Code not editable in web editor

I was able to connect my Eyesy to my ancient computer (2010 MacBook Pro) using AP mode, as well as my local WiFi network. I’d like to edit the code and create my own modes but the editor window at eyesy.local won’t display code, only the information about the file I’m trying to open.

Is there an operating system/browser requirement that makes the code appear editable or am I missing something?

Can you post a screenshot showing the information displayed in the editor?
Which browser are you using?

I’m using Safari version 6.1.6 as my computer no longer supports updates to the browser or operating system. This image is after attempting to open a file. When I first open the editor it just displays “… connected to websocket server”

Is that the only browser you have installed on that computer?