Fihaonambe Fanampiana Firefox ho an'i Android

if I go to any website then during login it doesn't suggest me I'd or username but suggest passwords in password section although I save both of them please correct this because sometimes it creates turble for me.

I find a bit illogical the fact that cookies are kept after all tabs that set those in incognito mode were closed. Have to close Firefox completely to make Google forget my account name.