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Two Firefox Private Browsing sessions are sharing data.

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I launched Private Browsing Firefox session & logged in to gmail then, I launch another Private Browsing Firefox session. This time, again I visit gmail.com & I got logged in to my gmail inbox without authentication even though I am in two different Private Browsing sessions. Then, again, I launched 3rd Private Browsing Firefox session, this time I visit google.com & I can see my gmail ID on right hand top corner. I have opted “Automatically start Firefox in Private Browsing” as I don’t want to let google search keep my search history. It seems like Firefox do share cookies & other data in Private Browsing sessions. So how these sessions can be called Private Browsing if they are sharing data?

Note: I have tried “Start Private Browsing” manual command as well but found no difference in behavior.

I launched Private Browsing Firefox session & logged in to gmail then, I launch another Private Browsing Firefox session. This time, again I visit gmail.com & I got logged in to my gmail inbox without authentication even though I am in two different Private Browsing sessions. Then, again, I launched 3rd Private Browsing Firefox session, this time I visit google.com & I can see my gmail ID on right hand top corner. I have opted “Automatically start Firefox in Private Browsing” as I don’t want to let google search keep my search history. It seems like Firefox do share cookies & other data in Private Browsing sessions. So how these sessions can be called Private Browsing if they are sharing data? Note: I have tried “Start Private Browsing” manual command as well but found no difference in behavior.

All Replies (4)

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You are only ever in one session, as no more than one can exist at the same time, regardless of the number of windows open.

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Thanks for the reply. Is there any way to have multiple sessions so that Private Browsing feature can be used fully?

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There is an extension at https://addons.mozilla.org/en-US/firefox/addon/59736/ but only for a single private browsing window to be running at the same time as your normal window.

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Dump firefox and use the File->New Session option in Microsoft's IE browser. I am a software developer and from my personal experience I can say that firefox sucks, and is the least secure browser out there.

You'll find this out when someone hijacks your bank account after you've accessed it using firefox.