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How can I make the setup for cookies to seperate different Firefox Windows?

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Hallo, Cookies should by private to one Browser Window. So for example, if I open a second Tab with youtube, or whatever, I would like to have my login data from the first tab. But if I open a second window, this data should not be seen. I don't want other sites to be able to see my login.

The cookies should be deleted, when the Window with all Tabs is closed, independent from other open Browser windows. How can I realize this? Thank you, Michael Lange

Hallo, Cookies should by private to one Browser Window. So for example, if I open a second Tab with youtube, or whatever, I would like to have my login data from the first tab. But if I open a second window, this data should not be seen. I don't want other sites to be able to see my login. The cookies should be deleted, when the Window with all Tabs is closed, independent from other open Browser windows. How can I realize this? Thank you, Michael Lange

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Please see this support article:
https://support.mozilla.org/en-US/kb/private-browsing-use-firefox-without-history

Gives you per Private Window privacy / separation to make that window independent from other open Browser windows. And when the Private window is closed cookies and other data will be deleted. That data is only present when the Private window is open.

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You can use containers to keep cookies for tabs or windows separate.