I have a new Tp-link TD-8816 modem whose configuration page is located at 192.168.1.1. But somehow while Ubuntu's native browser is able to log me in, in Firefox I am served a 403 Forbidden error instead. I am sure I am entering the right password. When I enter this IP, Firefox doesn't even focus the username box for me, while the other browser does. Running Firefox in safe mode hasn't solved the problem. It seems I cannot copy and paste the source code of the page right here. If you want it, I can put it up on pastebin. Any help would be appreciated. I have attached a screenshot of the pages that come up after I enter the credentials and press LOGIN. Thanks in advance.