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How can I run two browsers simultaneouly with two different sign ons?

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I log in on Explorer for my work e-mail account on Yahoo. I check the box the says "keep me signed in". I then log on using Firefox to my personal e-mail (also on Yahooo) and check that box to stay signed in. In the past, I used to be able to click back and forth from one to the other and remain signed in on each.

I log in on Explorer for my work e-mail account on Yahoo. I check the box the says "keep me signed in". I then log on using Firefox to my personal e-mail (also on Yahooo) and check that box to stay signed in. In the past, I used to be able to click back and forth from one to the other and remain signed in on each.

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In Firefox all browser windows and tabs use the same cookies that will identify you to the server. If you open a different account then existing cookies are send to the server and the server sees that you already signed on (authenticated).

You can look this extension if you want to sign on with different identities at the same time: