Version 73 update - can not browse internet, supper slow. Internet Explorer works great - full speed of my plan. Had McAfee log in, they be leave it's a Firefox issue. Tried ever tweak you have here - zero help. Un-installed re-installed and it seamed ok for two days and doing it again. speedtest.att.com will not even load - errors out could not find any server or something is blocking the connection are messages from Att. Firefox has been my go to browser for ever but this is un expectable. FYI After typing this all out, if I hit the "Automatically add" trouble shooting below the "Details" box I get a page not found error (something like that) and this whole block gets erased when I hit the back button.