Voting starts in March for the Drupal Association Board election.
After installing drupal (latest head) I disabled the overlay module and I noticed that primary tabs stopped working!
My screen reader recognizes the title "Primary tabs" and the tabs as plain text, so I cannot use them at all.
I don't know if this is a bare accessibility issue or primary tabs are broken on Mac OS X (don't know for other OS) even for sighted users.
When the overlay module is enabled primary tabs work properly.