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Hi, if you are using the chromium browser family, you can try passing 'incognito' preference to win.open command:
`cy.window().then(win => {
    const options = {
        chromePreferences: {
            'incognito': true
        }
    }
    win.open(url, '_blank', options)
})`

Thanks for the respons!. Its not working, pretty sure this code is invalid.. is chromePreferences even a real option that could be passed? I dont think so, i also dont see any documentation for it.