I was unable to log into my dsl.att.yahoo.com homepage after I upgraded to version 4.0.1 of Firefox on my W7 home machine. I had no such problem logging in away from home, where I run version 3.0.19 of Firefox from my U3 thumb drive. I could still access dsl.att.yahoo using IE at home.
I twiddled with Firefox and eventually disabled my AOL toolbar. Voila! I can now access this homepage consistently from my home machine.
