I need to log in with different accounts in a web site. I did that for a long time. But now, they changed and added a new login window on top and whenever I log in with a different username, it's as if I'm logged in as the first username I used. I tried to clean my cookies or change my IP but there was the same result. Then I waited the next day and I could log in successfully with a different account. The problem is that I don't want the next day for every account. Is there a trick that would allow me to log in with a different account when I want?