Firefox issue - can I ask?

Question

Hello All,

Though I am asking the question directly but my major concern is where should I ask a general query related to something other than C# like in my case firefox.

I have getting a authentication form pop-up where it asks for moz-proxy://....:port and username and password.

I want to get rid of it and I am not getting proper and clear help on internet.

Thanks for help.

Regards,
iwx