Recent news item from PC Advisor.Followed instructions to backup F/F config. file. Typed 'About :config' and pressed enter. Instruction then says 'enter network.http in the filter field' then make following changes but I obviously have do not have correct page because I do not have 'filter field'. The saved 'prefs.js' file says there is error 'ivalid character', 'code 800A03F6', 'M/S JScript compilation error'. Can any explain?