to the right of the button for 'new contact' is an icon to create mailing list. And it was NEVER on the main screen, but on the addressbook pane ( I just verified with a copy of 102)

Thank you. I found the solution (see below).

And in case this is helpful for others

2) Note: I was in the Addressbook pane. Mozilla's instructions are outdated: See image - same as I stated above. I haven't created a list in awhile, so this is how I remember doing it - no longer the case.

3) I tried the icon next to the "create new contact" however, it was grayed out. I discovered that I had clicked on another addressbook below the column, which grayed it out. Clicked on main addressbook, and voila. Worked!