I think you need to add this to the /users/ etc pages for it to show up on the stats listings. If it's there, I might be cached and can't see it yet.
<link rel="icon" href="/favicon.ico">
Those are simple file logs so have no html. Only the top page and the GUI stats have the favicon.
I think even a request for a text or logfile will also result in a request for /favicon.ico if it exists.
Though that might get cached if it was 404 in the past and a SHIFT+Reload could help.
At least that's what Firefox browser console tells me.
HTH