1977017 - Some logins persist through Private Browsing when using "Delete browsing data on quit"

Status: UNCONFIRMED

(Firefox for Android :: Privacy, defect, P1)

Description

[bugzilla.nail674]

User Agent: Mozilla/5.0 (Android 16; Mobile; rv:140.0) Gecko/140.0 Firefox/140.0

Steps to reproduce:

1. Reinstall FireFox to remove any extensions and reset settings.
2. In settings, turn on "Delete browsing data on quit". Turn on every option including "Cookies and site data".
3. Open a Private Browsing tab.
4. Connect to nexusmods.com.
5. Login with an account.
6. Exit private browsing using the "Quit" button.
7. Immediately reopen FireFox.
8. Open a new private tab.
9. Connect to nexusmods.com.
10. Check if your account is still logged in.

Actual results:

Despite ending the private browsing session, the account is still logged in.

Expected results:

The account should have been logged off.

Comment 1

[bugzilla.nail674]

This occurs inconsistently, so I apologize if these steps don't reproduce the issue. I have to add one more step.

Steps to reproduce:

1. Reinstall FireFox to remove any extensions and reset settings.
2. In settings, turn on "Delete browsing data on quit". Turn on every option including "Cookies and site data".
3. Open a Private Browsing tab.
4. Connect to nexusmods.com.
5. Login with an account.
   6. Open a new Private Browsing tab, and Google search any query (e.g. "asdf").
6. Exit private browsing using the "Quit" button.
7. Immediately reopen FireFox.
8. Open a new private tab.
9. Connect to nexusmods.com.
10. Check if your account is still logged in.