Allow users to disable insecure web site warnings for devices on local LAN

[usability]

I have a bunch of hardware devices which are running a web server for their configuration (router, printer, power plugs etc.)
None of these have a certificate or support HTTPS and it is a nuisance that Firefox treats these devices as insecure.
They mostly run on firmware only and don't have any connection to the outside world.
Thus, there should be a way to disable the insecure website warning for devices on local LAN.

[Jon]

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