@ John Faulds: While Drew is much better qualified to give you an in-depth answer about this than me, I will just say that I use Operator for Firefox as well, and the contact exports just fine for me… and automatically adds it to OSX’s Address Book app without a problem. I can only guess that it’s therefore a problem with Windows Contacts, Yahoo Contacts, or perhaps Operator / Firefox on Windows.
@ John Faulds: While Drew is much better qualified to give you an in-depth answer about this than me, I will just say that I use Operator for Firefox as well, and the contact exports just fine for me… and automatically adds it to OSX’s Address Book app without a problem. I can only guess that it’s therefore a problem with Windows Contacts, Yahoo Contacts, or perhaps Operator / Firefox on Windows.