0 Firefox was working ok to browse localhost:8000 on a development machine running Django development server. However, it suddenly stops working (perhaps after a nightly update). The Django server is running fine at http://127.0.0.1:8000/ but when trying to browse http://localhost:8000/ it just shows the following page: https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2020-07-07-07-00-36-6e06d5.png Other browser such as Epiphany browser are working ok. I know it´s a problem with Firefox settings because I fixed before for the previous version but unfortunately I don´t remember how I fixed it (I feel so silly now for no been taking notes). It seems that now Firefox updated automatically overnight and override the settings. Any ideas?