[Zope] login as member and manager with one browser on CMF

Hi to all, Is it possible to login as a user and manager in two windows with the same browser on CMF? To login as a certain user I shutdown my mozilla completey, and call CMF with the users homepage URL. Then I open a second window as a manager and login. If I do anything in the user window, I find me logged in as the manager in the reply window. How can I avoid this? Switching off cookies? No - Then I have to enter the pword everytime, haven't I?? Thanks, Florian