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spnego authentication is not supported on this client error Firefox using Macbook

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Using Macbook firefox browser, I am trying to open a website. But it shows error "spnego authentication is not supported on this client "

I tried the steps given

But Even after that, I get the error still. What didi I miss, I dont understand. Hope I get an positive answer. Thanks for your help.

Mas os version 10.15.5 Firefox v 78.0.2 (64-bit)

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