Thank you for your feedback.
As for kltext.txt, mozilla quantum no longer supports direct access to the file system through javascript. That is why I nifty keylogger now stores the log in a local storage object "storedkl". Its content are accessed through the shortcut K.
As for address bar capturing, are you sure previous versions provided this functionality? The issue here is that document.addlistener("keypress") relies on a document. Unfortunately, the address bar is not a document.