Firefox Detectportal Message when using .PAC files

I am using a working ipfire .PAC files enviroment. Everything works fine exept an annoying portal message of firefox webbrowser (in linux and macOS) every time when I start firefox.

But of course websites are loading. Did I mention that i hate this portal site stuff? This is annoying and I would like to get rid of it at least in my own networks.

I’ve tried to enter .PAC file location into firefox manually. I’ve let firefox search for it automatically, nothing really worked. Anybody got a lead?

I can not tell anything about PAC because i have no experience with it. But the portal thing maybe it helps you do set in firefox

network.captive-portal-service.enabled false

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good morning, yes, this setting works for me, thanks