Hi,
+1 :-) I also want to run tests in two different browser windows (not tabs though). I've built a forum + chat, and I'd like to test that messages sent by user no 1, appears for user no 2, and vice versa.
I suspect I need two completely different browsers, e.g. Chrome and FF, or two totally separate instances of Chrome — because each user has its own cookies. So only two different tabs won't work.
(In fact, I might want to start perhaps three or even four browsers. To test many people in the forum/chat at once.)
Best regards, KajMagnus