Yes, I know. My first action was to save your code and run it - at which point I got the error message I described. So, I tried the URL via the address bar and it worked. I've since found this page[^], which describes the error message, but in relation to jQuery. It tells you that FireFox's security model is stopping you access the page.
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p