Dear Mozilla team,
Please consider making Private Browsing (In-Cognito windows) open as "Guest" user or at least provide the option to "Browse as guest".
When using an account to Sync and browser is "Signed In", opening a private browser window has the Firefox account "attached" to it, it does open a private window but the account should not be connected to these type of windows or, at least, add the option to "Browse as Guest".
Thank you for your consideration