Sorry but the new system is still in it's infancy and it maybe that this will be rectified.
The new log-in is intended to provide more security and to make logging in or joining easier.
As I have said before one way to extend time before next log-in is to bookmark your profile page (after logging in) and to access the site using the bookmark.
Also you could use the ShareTV widget (see information forum).
I also use 'most visited' as a bookmark as I too use Firefox.