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Questions Tags Users Jobs Unanswered Firefox 78.0.1 does not connect to Django development server running at localhost:8000

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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 but when trying to browse http://localhost:8000/ it just shows the following page:

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?

Attached screenshots