1 star for this very nice idea, but... not working at the moment.
It looks like Google dislikes autologin via scripting. Since last weekend they changed something in their login form and that change disabled this very nice script. All fans are waiting for repairs...
EDIT: upgraded to 3 stars for the time being.
Nice quick support, after Google made changes!

My previous review was;
I've been using this multi-login script to great effect allowing me to access all of my gmail accounts quickly and easily.

But its functionality has become *increasingly spotty
*working less and less over time, *interferes with gmail accounts even when disabled
*doesn't work for google apps accounts