Yahoo hosts my e-mail. It is under a primary e-mail address under @yahoo.com. Under that primary account, I have another e-mail address that is based on my own domain name. When I get on firefox and bring up yahoo, it opens under my yahoo.com address but it has a "logged in under" section which allows me to go to my .(my domain) address. When I click on that, my .(my domain) mail comes up for an instant and then firefox shifts me back to the .yahoo account. This happens on my newer most recent windows computer but not on my older one and never, ever happens on internet explorer. I may have to abandon firefox for internet explorer if you cannot fix this. John Howard